AF confirm on adapter - what does it mean?

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scotchegg

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I'm thinking about purchasing an adapter for my Olympus OM lenses, to fit on a Canon 550D. The thing is, some of them have 'AF Confirm' chips on them, some dont, with a noticeable price difference between them. What I want to ask is, what does the chip actually do?

Lenses:
Olympus OM 50mm 1:1.8 (standard)
Tokina RMC 135mm 1:2.8
Olympus OM 60-200mm 1:4

I'm slightly confused as different sources tell different stories. Thanks
 
Think of it as MF confirm.
What it is in an electronic chip on the back of the adapter that has contacts which connect to the camera's contacts in the lens mount which tells the camera that a lens is attached. The camera will then allow you to use the "AF-confirm" feature, where the AF points in the viewfinder light up when they detect they are in focus.
It's still manual focus, but the camera will tell you when it thinks you've got it bang on.

Quite a handy feature with the small, bright viewfinders a lot of DSLR's have, since MF lenses were really designed to be used on camera with large heavily matted viewfinders, often with split prisms.
If you want to be using it with the viewfinder, I'd recommend getting one with the chip.
If you're planning to use the lenses just for stuff like landscapes where you can use live view and zoom in to get the focus perfect, you might as well save the cash and get it without.
 
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Ah, thanks greatly for that info. I was maddeningly confused, as none of my lenses had 'auto-focus' which is quoted (wrongly it seems) on various products. I think I will probably shell out the extra funds to get one with the chip. Thanks :)
 
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