These designations have nothing to do with optics, and the image quality of an STM lens vs a USM lens will be completely unaffected. This system placed the autofocus motor—the motor that is used to drive a lens focusing mechanism—in the lens itself. This was in contrast to other manufacturers, such as Nikon, who were placing the autofocus motor in the camera.
These days, putting the AF motor in the lens is the standard, and pretty much every manufacturer makes lenses this way. Canon USM lenses use ultrasonic vibrations to power the autofocusing mechanism, and this comes with several clear advantages:.
First, Canon USM lenses are fast. STM lenses, on the other hand, can come with some manual focusing lag—because there is no mechanical coupling to the focus ring. All forums Beginners Questions Change forum.
Started Jul 12, Discussions. Forum Threaded view. Jul 12, Two quick beginners questions and then a ramble.. Are the Canon EF lenses all fixed i. Reply to thread Reply with quote Complain. Re: Canon EF vs. EF-S vs. I don't think the is that good. I think the is not that good either. Guidenet's gear list: Guidenet's gear list. Reply Reply with quote Reply to thread Complain. USM is an autofocus motor technology.
Doug Pardee's gear list: Doug Pardee's gear list. That depends on what you want to do and how you want to do it. Gene L. The decision comes down to trade-offs between projected needs and budget.
Brian D. In reply to Brian D. Schneider wrote: ptl wrote: 60mm F2. In reply to Gene L. Just curious if it actually works on a regular basis for you. Guidenet wrote: Do people really lend glass back and forth. F Forum M My threads. Latest sample galleries. Tamron mm F2. Panasonic S 35mm F1. DJI Mavic 3 Cine sample gallery. Nikon Z9 pre-production sample gallery. See more galleries ». Latest in-depth reviews. Read more reviews ». Latest buying guides. Best video cameras for photographers in Best cameras for Instagram in Best drones in Best cameras for vlogging in Check out more buying guides ».
Nikon Z9 initial review. Sony a7 IV initial review. Nikon Nikkor Z mm F2. Sigma mm F Discover more challenges ». Nikon Z9 4. Popular interchangable lens cameras ». Popular compact cameras ». Canon has made several statements over the past year indicating that they will not be making new EF lenses. That is a simple way of saying that they are moving away from the EF mount, without having to explicitly say it.
Combine the fact that all their new pro bodies even semi-pro and beginner, technically now use the RF mount except the IDX MK3 , there is little incentive for Canon to keep making new EF lenses. However, their cinema line of cameras still uses the EF mount, but most people using them will also use the cinema lens lineup, not their photo lenses.
This is a tricky question to answer. EF lenses are also a tad bit cheaper and offer similar performance to their RF counterpart. So my suggestion would be to invest in RF glass first, and only buy EF lenses if you can't find a particular lens in the RF lineup that you need immediately, or if you want to save some money.
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Nicholas Mitchell Nicholas is a staff writer at Photodoto. His interests include photography, collecting cameras old and new, video editing, and all things 3d. If a new gadget comes out on the market, he's sure to be the first to try it. He enjoys experimenting with low light photography, very long exposures and high speed filming. Your name here. More information.
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