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Old Apr 2, 2005, 6:00 AM   #1
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Canon have the USM (quick focus), IS (stable image) and DO (???).

What are the equiviant technologies in Sigma and Tamron and more importantly what do they do?

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Old Apr 2, 2005, 6:53 AM   #2
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'USM' = Ultrasonic - no gearing -> quiet, fast, and with full AF manual overide. Nikon calls this feature 'Silent Wave' Minolta calls it 'SSM' and Sigma use the term 'HSM' for their lenses. Tokina and Tamron do not yet offer this mechanism.

'IS' = Image Stabilization -> compensate for camera shake during slower shutter speed like handheld in the dark without requiring a tripod (it does not freeze subject movements). Nikon calls this 'VR' while Minolta use the term 'Anti Shake'and Sigma has 'OS' for optical stabilization, again Tamron and Tokina has yet to introduce this feature

'DO' = Diffractive Optic - special glass property which allow a lens to be made really compact, and only Canon has theses 2 lenses: http://www.luminous-landscape.com/re...70-300mm.shtml

'L' - Luxury or high-end line -> always of higher quality than non-L. Nikon has some kind of alphabet soup for this, Minolta calls their 'G' series, and Sigma uses 'EX' to denote their professional line... I believe Tamron now uses the term 'XR' while Tokina put 'Pro' behind the lens designator.
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