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the-digital-picture.com Did a review about this product. The Canon EF 500mm f/4.0 L IS USM Lens is considered a Super Telephoto Lens.
“A super long focal length is the biggest attraction to the Canon EF 500mm f/4.0 L IS USM Lens and where the product category gets its title. Super image quality and sharpness are highly notable features. Super size might be a downside (unavoidable in a lens with the Canon EF 500mm f/4.0 L IS USM Lens' specifications). A super high price is not welcomed by most.”
“And super-focusing. Utilizing Ring USM (Ultrasonic Motor), the Canon EF 500mm f/4.0 L IS USM Lens focuses very fast, very accurately – and very quietly. FTM (Full Time manual) focusing is enabled. A 3-position focus limiter switch allows focusing distances to be limited to a specific distance range (4.5m to 10m, 10m to infinity, 4.5m to infinity) – or to be unlimited. Limiting the focus distance range can improve focus lock times and reduce focus hunting.”
“Autofocus Stop buttons (near the objective lens) allow autofocus to be temporarily stopped. This feature is handy when tracking action in AI Servo mode and one-shot-style focus is needed for a specific situation – perhaps a focus-and-recompose portrait of a motionless person, bird, landscape or other subject.”
“The Canon EF 500mm f/4.0 L IS USM Lens is equipped with a Focus Preset feature. Set the Focus Preset to a specific distance – when your shooting needs require that specific distance, simply turn the white knurled playback ring on the end of the lens. Autofocus Stop buttons near the objective lens allow autofocus to be temporarily stopped.”
