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| p.1 #9 · How accurate AF Confirm C/Y to EOS adapter from eBay |
The accuracy of focus confirmation is determined by the camera, not the chip. The chip simply makes the camera think that there's an AF lens attached, and so the camera evaluates focus.
Sort of. . .
I have a couple of programmable adapters and these direct the lens focusing -- notably one is on my C/Y 80-200/4 and is extremely accurate. I have one other on an alt lens that is accurate and wonderful to get focus confirmation. The other three or four would not take the programming or were simple pre-programmed models that weren't precise -- I stripped the chips off those and am much happier to manually focus with the OVF. In future, I'll not be buying the inexpensive chipped adapters and instead stay with the non-pro manual adapters from Fotodiox and HK. I recommend staying away from the cheap chipped adapters, but hey, I tried, so anyone is welcome to do the same.
Naturally, Voightlander, Zeiss ZE, ZF, etc, are perfectly fine and set up properly. I'm just referring to adapters, not independent lens makers.