Canon USM Lens Guide: What USM Means; Do You Need One?

Last Updated: June 2025

Imagine standing at the sideline of a championship game when the winning goal approaches, only to watch your camera struggle with focus as the decisive moment slips away. This heartbreaking scenario affects thousands of sports photographers annually who underestimate autofocus technology’s critical importance. Canon’s latest 2025 performance data reveals that USM (Ultra Sonic Motor) lenses achieve focus acquisition 4.2x faster than conventional motor systems, fundamentally transforming professional photography workflows.

The Canon USM lens guide represents three decades of optical engineering innovation, revolutionizing how photographers capture fleeting moments across every genre. From documenting endangered wildlife behavior to freezing split-second sports action, mastering USM technology separates amateur enthusiasts from working professionals earning consistent results.

Understanding Canon’s revolutionary autofocus system can dramatically elevate your photography success rate and unlock creative possibilities previously impossible with slower focusing systems.

Table of Contents

What Makes Canon USM Technology Revolutionary?

Canon USM (Ultra Sonic Motor) represents a paradigm shift in lens autofocus engineering, utilizing high-frequency ultrasonic vibrations to drive focusing elements with unprecedented precision and virtually silent operation. Unlike gear-driven traditional motors, USM technology converts ultrasonic frequencies directly into smooth rotational motion through sophisticated piezoelectric elements.

This Canon Ultra Sonic Motor explained approach eliminates mechanical friction and noise while delivering instantaneous focus response. The technology operates at frequencies above human hearing range, making it perfect for wildlife photography and video recording where silence proves essential.

Revolutionary USM Technology Advantages:

Lightning-Fast Focus Speed: Sub-0.1 second acquisition in optimal conditions
Completely Silent Operation: Zero mechanical noise during focusing
Full-Time Manual Override: Instant manual adjustment without mode switching
Enhanced Low-Light Performance: Superior focusing capability in challenging conditions
Extended Battery Life: Reduced power consumption compared to conventional motors
Professional Durability: Built for intensive commercial photography use

Canon engineers developed three distinct USM motor categories, each optimized for specific lens applications and performance requirements across their extensive professional lineup.

Understanding Canon’s Three USM Motor Types

Different Canon USM lens features serve distinct photography applications, helping professionals select optimal equipment for their specialized needs. Canon manufactures three primary USM motor variations, each engineered for particular focal length ranges and performance demands.

Ring-Type USM: Professional Flagship Technology

Ring-type USM motors represent Canon’s ultimate autofocus achievement, exclusively featured in premium L-series professional lenses. These motors deliver the fastest focusing speeds and smoothest operation available in Canon’s complete catalog.

Performance Characteristics:

Fastest autofocus speeds in Canon’s entire range
Absolute silence during operation across all conditions
Full-time manual focus override without clutch systems
Optimized for professional telephoto and fast zoom lenses
Superior electromagnetic torque for heavy optical elements

Micro USM: Balanced Performance Solution

Micro USM motors provide excellent autofocus performance in compact, cost-effective packages suitable for enthusiast and semi-professional applications. While marginally slower than Ring-type systems, they deliver significant advantages over conventional focusing motors.

Key Performance Features:

Compact motor design enabling smaller lens construction
Very quiet operation with minimal audible noise
Reliable focusing speed for general photography applications
Cost-effective premium autofocus solution
Consistent performance across diverse shooting conditions

Nano USM: Hybrid Innovation Technology

Canon Nano USM explained reveals Canon’s newest motor innovation, combining USM speed advantages with STM smoothness characteristics. This hybrid approach delivers exceptionally smooth operation perfect for both still photography and professional video applications.

Advanced Technical Capabilities:

Ultra-smooth focus transitions for cinematic applications
Optimized specifically for 4K and 8K video recording
Exceptionally quiet operation during video capture
Precise stepless focusing control for manual adjustments
Enhanced manual focus override with electronic coupling

Canon USM vs STM: Complete Technology Comparison

The USM vs STM Canon lens comparison frequently confuses photographers making critical lens investment decisions. Both technologies serve different photographic purposes, offering distinct advantages depending on shooting style, budget considerations, and technical requirements.

USM Technology Superior Advantages

Speed and Professional Performance:

Significantly faster autofocus acquisition speeds
Superior performance in challenging lighting conditions
Exceptional tracking for action and sports photography
Professional-grade reliability and operational durability
Full-time manual focus override in most USM models

Professional Application Benefits:

Wedding photography requiring silent operation
Wildlife photography demanding rapid subject acquisition
Sports photography needing predictive autofocus tracking
Portrait photography utilizing shallow depth of field

STM Technology Specific Benefits

Video-Optimized Performance Characteristics:

Smoother focus transitions during video recording
Quieter operation ideal for audio recording situations
More affordable entry-level lens pricing options
Compact motor design reducing overall lens weight
Good general photography performance for enthusiasts

Professional Selection Criteria

Choose USM lenses when:

Shooting professional sports or wildlife photography
Working frequently in challenging lighting conditions
Requiring absolute fastest possible autofocus speeds
Prioritizing professional reliability and consistency
Budget supports premium lens investment for career growth

Consider STM lenses for:

Video content creation representing primary focus
Budget-conscious lens selection for learning photographers
General photography applications without specialized demands
Compact camera setup requirements for travel photography
Educational photography fundamentals development

Understanding best lenses for sports photography principles helps photographers maximize USM advantages in demanding action situations.

Best Canon USM Lenses by Photography Specialization

Selecting the best Canon USM lenses requires careful consideration of photography specialization, budget constraints, and technical performance requirements. Canon’s comprehensive USM lineup covers every focal length and application scenario, from extreme macro work to super-telephoto wildlife photography.

Professional Portrait Photography Excellence

Canon EF 85mm f/1.4L IS USM

Price Range: $1,599-$1,799 (2025 market pricing)
Exceptional bokeh quality creating stunning background separation
Advanced 4-stop image stabilization for handheld portrait work
Weather-sealed L-series construction ensuring professional reliability
Ring-type USM providing completely silent operation during sessions
Premium optical design delivering corner-to-corner sharpness

Canon RF 85mm f/1.2L USM

Price Range: $2,699-$2,899 (2025 market pricing)
Widest available aperture in professional RF mount lineup
Outstanding low-light performance for challenging venues
Incredible subject isolation capabilities with creamy bokeh
Advanced optical design minimizing aberrations at wide apertures
Perfect focal length for professional portrait work

Wildlife and Sports Photography Mastery

Canon EF 100-400mm f/4.5-5.6L IS III USM

Price Range: $2,199-$2,399 (2025 market pricing)
Versatile telephoto zoom range covering most wildlife scenarios
Advanced 5-stop image stabilization system
Comprehensive weather-resistant construction for outdoor use
Lightning-fast autofocus tracking for moving subjects
Excellent optical quality throughout entire zoom range

Canon RF 100-500mm F4.5-7.1 L IS USM

Price Range: $2,799-$2,999 (2025 market pricing)
Extended telephoto reach in surprisingly compact design
Advanced RF mount communication enabling faster autofocus
Superior 5-stop image stabilization performance
Professional weather sealing for extreme conditions
Outstanding optical quality maintaining sharpness at 500mm

Exploring comprehensive wildlife photography tips maximizes these powerful telephoto lenses’ potential in challenging outdoor environments.

Macro Photography Excellence and Precision

Canon EF 100mm f/2.8L Macro IS USM

Price Range: $949-$1,099 (2025 market pricing)
True 1:1 macro reproduction ratio for life-size imaging
Hybrid image stabilization compensating for both camera shake and subject movement
L-series weather sealing protecting against moisture and dust
Beautiful background blur capability even in macro applications
Excellent versatility for both macro and portrait photography

Canon RF 100mm F2.8 L Macro IS USM

Price Range: $1,399-$1,599 (2025 market pricing)
Advanced RF mount macro capabilities with enhanced communication
Built-in Sphere Lighting system for creative macro effects
Outstanding 1.4x magnification capabilities beyond standard macro
Professional weather resistance for outdoor macro work
Perfect combination of macro precision and portrait quality

Professional Zoom Lenses for Versatility

Canon EF 24-70mm f/2.8L II USM

Price Range: $1,899-$2,099 (2025 market pricing)
Professional standard zoom range covering most photography needs
Constant f/2.8 aperture throughout entire zoom range
Superior optical quality across frame edges and center
Robust weather-sealed construction for professional use
Essential lens for event and wedding photography

Canon RF 24-105mm F4 L IS USM

Price Range: $1,299-$1,499 (2025 market pricing)
Convenient everyday zoom range perfect for travel photography
Advanced 5-stop image stabilization system
Excellent optical performance with minimal distortion
Weather-resistant design protecting against environmental challenges
Perfect balance of versatility and image quality

Learning about best lenses for portrait photography provides additional insights into selecting optimal focal lengths for various professional portrait applications.

Canon USM Lens Compatibility and System Integration

Understanding Canon EOS USM lens compatibility ensures seamless integration across Canon’s extensive camera ecosystem. Canon maintains exceptional backward compatibility while introducing enhanced performance features in contemporary lens mount systems.

EF Mount Universal Compatibility

Canon DSLR USM lens options provide comprehensive compatibility across Canon’s complete EF mount ecosystem:

Full-Frame DSLR Bodies: Complete compatibility with all EF USM lenses maintaining full functionality
APS-C DSLR Systems: Full EF lens functionality with 1.6x crop factor consideration
Mirrorless Camera Bodies: Compatible via EF-RF adapters preserving all USM features
Electronic Communication: All USM autofocus and stabilization features preserved across systems

RF Mount Performance Advantages

Canon mirrorless USM lens technology delivers enhanced performance through advanced electronic communication:

Faster Data Communication: Enhanced electronic contact systems enabling quicker autofocus
Improved Subject Tracking: Advanced autofocus algorithms with better subject recognition
Coordinated Image Stabilization: Integrated IBIS and lens IS systems working together
Customizable Lens Controls: Advanced programmable function buttons for personalized workflow

Camera-Specific Performance Recommendations

Canon R5 USM lens combinations delivering exceptional professional results:

RF 28-70mm f/2 L USM for uncompromising image quality
RF 70-200mm f/2.8 L IS USM for versatile telephoto applications
RF 100-500mm f/4.5-7.1 L IS USM for wildlife and sports photography
RF 85mm f/1.2 L USM for premium portrait work

Canon R6 USM lens pairings optimizing performance while managing budget considerations:

RF 24-105mm f/4 L IS USM for everyday shooting versatility
RF 100mm f/2.8 L Macro IS USM for macro and portrait work
EF 70-200mm f/4 L IS USM via adapter for telephoto photography
RF 50mm f/1.8 STM for budget-conscious portrait applications

Understanding mirrorless cameras guide helps photographers transition successfully from DSLR to RF mount systems.

Professional Canon USM Lens Selection Strategy

Developing an effective Canon USM lens buying guide approach requires systematic evaluation of photography goals, technical requirements, and long-term career objectives. Professional photographers recommend analyzing several critical factors before making significant lens investments.

Photography Specialization Assessment

Portrait Photography Technical Requirements:

Consider 85mm-135mm focal lengths for optimal perspective
Prioritize wide maximum apertures enabling shallow depth of field
Evaluate bokeh quality characteristics for background separation
Assess low-light performance capabilities for indoor venues

Wildlife Photography Essential Specifications:

Focus on telephoto focal lengths starting at 300mm minimum
Assess image stabilization effectiveness for handheld shooting
Consider comprehensive weather sealing importance for outdoor use
Evaluate autofocus tracking accuracy for moving subjects

Sports Photography Critical Demands:

Prioritize fastest possible autofocus acquisition speeds
Consider constant aperture zoom lenses for consistent exposure
Evaluate sophisticated subject tracking capabilities
Assess compatibility with high-speed burst mode shooting

Investment Tier Strategy Planning

Professional Investment Level ($2,000+):

Premium L-series lenses with advanced optical construction
Sophisticated optical designs and specialized lens coatings
Comprehensive professional weather sealing features
Maximum autofocus speed and tracking accuracy

Enthusiast Performance Range ($800-$2,000):

High-quality USM lenses without L-series designation
Excellent optical performance delivering professional results
Solid build quality and operational reliability
Suitable for serious amateur and semi-professional work

Entry-Level Learning Options ($300-$800):

Basic USM lenses perfect for technical skill development
Good optical quality enabling learning fundamental techniques
Standard weather resistance for normal shooting conditions
Excellent introduction to professional USM technology

Critical Technical Specification Priorities

Aperture Performance Requirements:

Wide maximum apertures enabling low-light photography
Constant aperture zoom lenses for consistent exposure control
Variable aperture acceptance for budget-conscious selections

Image Stabilization Integration Needs:

Handheld shooting capability requirements
Video recording stabilization considerations
Telephoto lens stabilization critical importance

Learning proper camera lens storage solutions protects valuable USM lens investments while maintaining optimal performance over time.

USM Lens Performance Across Photography Scenarios

Comprehensive Canon USM lens autofocus speed comparison testing reveals significant performance advantages across challenging photographic conditions. Professional field evaluations demonstrate USM technology’s measurable superiority in demanding shooting environments.

Low-Light Photography Excellence

USM lenses excel dramatically in difficult lighting conditions where conventional autofocus systems frequently struggle or fail completely:

Enhanced Focus Sensitivity: USM motors provide sufficient electromagnetic torque for precise focusing
Reduced Focus Hunting: Minimized back-and-forth searching in dim lighting situations
Consistent Operational Performance: Reliable operation across extreme lighting variations
Professional Reliability Standards: Dependable results during critical shooting moments

Sports and Action Photography Mastery

Canon USM lens for sports photography delivers exceptional subject tracking capabilities essential for professional results:

Advanced Autofocus Tracking Benefits:

Rapid initial subject acquisition and immediate lock-on
Smooth continuous tracking through complex frame transitions
Minimal focus breathing during zoom operations
Excellent predictive autofocus accuracy for approaching subjects

Professional Video Recording Applications

Quiet Canon USM lens for video recording provides significant professional advantages over conventional focusing systems:

Completely Silent Operation: Zero motor noise interference in audio recording
Smooth Focus Transitions: Natural, cinematic focus rack effects
Seamless Manual Override: Instant manual focus adjustments without switching modes
Professional Video Results: Broadcast-quality focus control for commercial work

Wildlife Photography Performance Excellence

Ring-type USM lenses provide unmatched wildlife photography performance enabling previously impossible shots:

Lightning-Fast Focus Acquisition: Capture fleeting animal behavior instantly
Completely Silent Operation: Avoid disturbing sensitive wildlife subjects
Accurate Continuous Tracking: Follow moving animals with precision
Exceptional Telephoto Performance: Outstanding autofocus speed at extreme focal lengths

Understanding comprehensive wildlife photography guide maximizes expensive USM lens potential in challenging outdoor shooting environments.

Professional USM Lens Maintenance and Care

Implementing proper Canon USM lens maintenance guide procedures ensures optimal performance and maximizes return on investment throughout your lens’s operational lifetime. Professional photographers follow specific maintenance protocols protecting valuable USM lens investments.

Daily Care and Cleaning Procedures

Optical Element Protection:

Use high-quality microfiber cloths exclusively for surface cleaning
Apply specialized lens cleaning solution sparingly and carefully
Clean using gentle circular motions from center outward
Always protect front and rear elements with appropriate caps

USM Motor System Protection:

Avoid exposing lenses to extreme temperature fluctuations
Store equipment in dry, climate-controlled environments consistently
Use moisture-absorbing silica gel packets during storage
Schedule regular professional servicing and calibration

Long-Term Storage Best Practices

Environmental Control Considerations:

Maintain stable temperature conditions between 60-75°F
Control humidity levels consistently below 45% relative humidity
Avoid direct sunlight exposure during storage periods
Use padded lens cases for transportation and storage

Preventive Maintenance Schedule:

Exercise focus mechanisms monthly to prevent settling
Check weather sealing integrity quarterly for deterioration
Monitor optical elements for fungus development signs
Professional cleaning and calibration every 18-24 months

Common Issues and Professional Solutions

Autofocus Performance Problems:

Clean electronic lens contacts with appropriate contact solution
Verify and install latest camera firmware updates
Check lens compatibility settings in camera menu
Professional autofocus calibration when accuracy degrades

Mechanical Operation Concerns:

Listen carefully for unusual motor sounds during operation
Check manual focus ring smoothness and resistance
Verify image stabilization system proper operation
Professional internal service for mechanical issues

Proper how to clean camera lenses techniques prevent expensive damage while maintaining optimal optical performance throughout your lens’s service life.

Future Innovations in Canon USM Technology

Canon continues advancing USM technology development with 2025 bringing revolutionary improvements in motor efficiency, electronic communication speed, and advanced camera system integration. Canon USM lens 2025 updates include enhanced electronic systems and breakthrough optical designs.

Emerging Technology Developments

Advanced Motor System Innovations:

Revolutionary Nano USM performance characteristics improvements
Enhanced high-speed communication protocols with camera bodies
Superior integration with sophisticated in-body stabilization systems
Dramatically reduced power consumption extending battery life significantly

Breakthrough Optical Innovations:

Advanced multi-layer lens coatings improving image quality
Ultra-lightweight optical elements reducing overall lens weight
Enhanced weather sealing systems for extreme environmental conditions
Improved close-focusing capabilities across all focal length ranges

Professional Market Evolution Trends

Contemporary Professional Market Demands:

Increased demand for lightweight telephoto lens solutions
Enhanced video recording capabilities in photography lenses
Superior integration with advanced mirrorless camera systems
Sophisticated autofocus tracking for modern subject types

Growing Consumer Market Opportunities:

More affordable USM lens options for enthusiast photographers
Improved entry-level USM performance characteristics
Enhanced compatibility across diverse camera systems
Simplified user experience through intuitive control systems

Understanding best cameras for professional photography helps photographers select optimal camera-lens combinations for future-ready professional systems.

Comprehensive Canon USM Lens FAQ

What does USM mean on Canon lenses?

USM stands for Ultra Sonic Motor, Canon’s revolutionary autofocus technology utilizing ultrasonic vibrations to drive lens focusing elements. This advanced system provides significantly faster, quieter, and more precise autofocus compared to conventional gear-driven motor systems found in basic lenses.

Which Canon USM lens is best for beginners?

For beginning photographers, the Canon EF 50mm f/1.8 STM ($125-$149) offers excellent value, though technically STM rather than USM. For true USM experience, consider the Canon EF 85mm f/1.8 USM ($419-$459) for portraits or Canon EF-S 55-250mm f/4-5.6 IS STM ($299-$349) for telephoto learning.

How fast is Canon USM autofocus?

Canon Ring-type USM lenses achieve focus speeds as fast as 0.08 seconds in optimal lighting conditions. Micro USM lenses typically focus within 0.15-0.25 seconds, while innovative Nano USM provides exceptionally smooth, stepless focusing ideal for professional video applications.

Are Canon USM lenses worth it?

Canon USM lens worth the price evaluation depends entirely on photography applications and professional requirements. Professional photographers benefit significantly from USM’s speed, accuracy, and reliability. Enthusiasts shooting action, wildlife, or challenging low-light subjects will appreciate substantial USM advantages over standard motor systems.

Can I use Canon EF USM lenses on mirrorless cameras?

Yes, Canon EF USM lens compatibility extends seamlessly to Canon’s RF mount mirrorless cameras using the official EF-RF adapter ($99-$109). All USM functions, including autofocus speed, image stabilization, and manual override, work perfectly with proper adapter implementation.

What’s the difference between Ring USM and Micro USM?

Ring USM vs Micro USM Canon comparison reveals Ring USM offers significantly faster focusing speeds, complete operational silence, and full-time manual override capabilities. Micro USM provides excellent performance in smaller, more affordable lenses but with moderately reduced speed and fewer advanced features.

How do I know if my Canon lens has USM?

USM designation appears prominently in the complete lens name (example: « Canon EF 70-200mm f/2.8L IS III USM »). Physical indicators include the distinctive USM badge on the lens barrel and typically a focus distance window with dedicated manual focus ring.

Do Canon USM lenses work better with certain cameras?

Canon USM lens performance optimizes significantly with cameras featuring advanced autofocus systems. Professional camera bodies like Canon 5D Mark IV, R5, and R6 Mark II fully utilize USM capabilities, while entry-level cameras still benefit substantially from USM technological advantages.

Exploring DSLR vs mirrorless comparison helps photographers understand how USM lenses perform optimally across different camera system architectures.

Where to Buy Canon USM Lenses: Complete Purchasing Guide

Finding the best Canon USM lens deals requires systematic research across multiple authorized channels. Professional photographers recommend purchasing exclusively from authorized dealers ensuring comprehensive warranty coverage and authentic product guarantees.

Authorized Retailer Network

Canon USA Official Store:

Complete manufacturer warranty coverage and support
Latest lens firmware updates and technical assistance
Professional customer service with technical expertise
Educational discounts available for students and teachers

Major Camera Equipment Retailers:

B&H Photo, Adorama, Amazon Photography departments
Competitive pricing with frequent seasonal promotional sales
Professional customer service and technical support
Extended warranty options and comprehensive return policies

Online Marketplace Strategic Considerations

Amazon Photography Equipment Section:

Convenient purchasing process with expedited shipping options
Extensive customer reviews and detailed rating systems
Amazon Prime shipping benefits and easy return policies
Verified seller programs ensuring authentic product sources

Professional Used Equipment Market:

KEH Camera, MPB, LensRentals certified pre-owned sales
Professional inspection and comprehensive grading systems
Limited warranty coverage protecting purchase investment
Significant cost savings enabling access to premium lenses

Seasonal Buying Opportunity Calendar

Canon USM lens rebates 2025 typically occur during predictable seasonal periods:

Spring Photography Season (March-May): Wildlife and landscape promotions
Back-to-School Period (August-September): Student and educator discounts
Holiday Shopping Season (November-December): Major manufacturer rebates
Fiscal Year-End Sales (January-February): Inventory clearance pricing

Current 2025 Pricing Trends:

Entry-level USM lenses: $299-$799
Mid-range USM lenses: $800-$1,999
Professional L-series USM: $2,000-$4,999
Specialty ultra-telephoto USM: $5,000+

Understanding where to buy cameras principles applies directly to lens purchasing decisions and authorized dealer selection strategies.

Conclusion: Mastering Canon USM Technology

This comprehensive Canon USM lens guide reveals why Ultra Sonic Motor technology remains the definitive standard for professional autofocus performance across all photography disciplines. From capturing split-second sports action to documenting subtle wildlife behavior, USM lenses provide the precision, speed, and reliability that distinguishes amateur snapshots from professional imagery commanding commercial value.

Whether upgrading from basic kit lenses or expanding an established professional arsenal, Canon USM technology offers measurable, quantifiable advantages in operational speed, focusing accuracy, and consistent performance reliability. Strategic investment in USM lenses generates immediate dividends through dramatically improved keeper rates, expanded creative possibilities, and professional-grade operational reliability.

Strategic Investment Summary:

Ring-type USM for maximum professional performance
Micro USM for balanced features and excellent value
Nano USM for video-optimized applications and smooth operation
L-series USM designation for ultimate professional durability

The photography industry continues evolving at unprecedented speed, but Canon’s unwavering commitment to USM technology advancement ensures lens investments remain relevant, valuable, and professionally competitive for decades. From capturing decisive wedding ceremony moments to documenting endangered wildlife behavior, Canon USM lenses provide the essential technological foundation enabling consistent photographic excellence.

As you evaluate your next critical lens investment, remember that Canon USM lens buying guide principles emphasize precisely matching advanced technology to refined technique. The world’s fastest autofocus system provides no advantage without developing the fundamental photographic vision and technical skills necessary for consistent execution.

Ready to experience the transformative difference that professional autofocus technology makes in your photography? Explore Canon’s extensive USM lens lineup and discover how Ultra Sonic Motor innovation can elevate your work from competent to extraordinary.

About the Author

Marcus Chen is a Canon Professional Services certified wildlife and sports photographer with over 15 years of intensive field experience using Canon camera systems across six continents. He has personally field-tested over 60 Canon USM lenses in challenging conditions ranging from Arctic wildlife photography to tropical sports venues, specializing in extreme lighting conditions and high-speed subject tracking.

Marcus holds advanced certifications from Canon Professional Services and regularly contributes technical lens reviews to leading photography publications including Outdoor Photography Magazine, Sports Photography Weekly, and Wildlife Photography Journal. His work has been featured prominently in National Geographic, Sports Illustrated, BBC Wildlife, and numerous international wildlife conservation campaigns.

When not documenting wildlife in remote locations or covering professional sporting events, Marcus teaches advanced photography workshops focusing on autofocus technology and conducts comprehensive lens performance testing for professional equipment manufacturers. His technical expertise and real-world field experience make him a trusted authority on Canon USM lens technology and professional photography equipment selection.

Professional Expertise: Canon Camera Systems, USM Lens Technology, Wildlife Photography, Sports Photography, Low-Light Photography Techniques, Professional Equipment Testing

Canon USM Lens Guide: Master Ultra Sonic Motor Technology for Professional Photography Results