Canon Lens Acronyms and Abbreviations

[Richard CR]

Canon Lens Acronyms and Abbreviations is a long list that spans generations of lens mounts, systems, and eras. These acronyms and abbreviations identify decades of lens evolution, from the manual film era to today's hybrid mirrorless systems. This ended up being a lot longer than I thought, partly because I decided to add in Cinema.. […]

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[Jon741]

I'll repeat my comment from when dpreview did something similar (for lenses):

"USM" can mean several different things:

* Ring USM = Powerful Ultrasonic Motor, most useful when there's a fair bit of glass to move and you want to move it quickly, was pretty standard on most higher-end Canon lenses for a long time. Still used in RF lenses.

* Micro USM and Micro USM II = small and lower end USM motors, not much used now. The II is a shrunk version of the original.

* Nano USM = Linear Motor, the best current option on many higher-end lenses, two may be present, or can be combined with a VCM motor, or just used alone.

 

[Number95]

Great summary

 

[Traveler]

Nice article

 

[Click]

+1 Thanks Richard.

 

[wormss]

Just wondering if the 'A' for Astronomy line was excluded on purpose or by accident or was just felt it didn't meet the criteria ? The EOS 60Da (a being astronomy or astromodified)

 

[Chig]

RF Revolutionary Flange
Really?
Dreamed up by the marketing drones not the engineers

 

[P-visie]

Just wondering if the 'A' for Astronomy line was excluded on purpose or by accident or was just felt it didn't meet the criteria ? The EOS 60Da (a being astronomy or astromodified)

The ‘A’ fro astronomy is for the camerabody, not for lenses.

 

[CameraEngineer]

Sorry but RF being the acronym for "Revolutionary Flange" is completely false information and must be made up by the author. The correct answer is that RF stands for "Re-imagined Focus".