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STM lenses and older EOS bodies

Started Aug 31, 2014 | Questions thread
quiquae Senior Member • Posts: 2,265
Re: STM lenses and older EOS bodies

totleytom wrote:

I'm not sure there is a new protocol. That was always touted as one of the great advantages of the EOS system, right from the start in 1987: the camera would issue a high-level instruction, e.g. 'change focus to a nearer focus point' or 'close the aperture diaphragm', and it would be the lens which would convert that into specific instructions appropriate to the technology in the lens. We've had lenses with micro-motors (e.g. as in the 50mm f1.8), several variants of ultra-sonic motors, and now STM lenses, and (subject to the EF/EF-S/EF-M differences) they all just work on whatever body.

Well, the STM lenses do have one backwards-incompatible wrinkle: continuous AF when shooting video works only on recent APS-C cameras (650D, 700D, 100D, 70D). I did not bother to mention this before because the 350D doesn't shoot video at all. 

 quiquae's gear list:quiquae's gear list
Canon EOS R5 Canon EF 100mm F2.8L Macro IS USM Canon EF 70-200mm F4L IS USM Canon EF 16-35mm F4L IS USM Canon EF 100-400mm F4.5-5.6L IS II +6 more
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