New member here with a question regarding the mysteries of focus confirmation when fitting a manual focus lens to Canon EOS type digital and film bodies. I have a fair number of M42 Pentax Takumar lenses I'd like to use on my EOS 40D or 5DMkIV digital cameras, as well as on a number of EOS film cameras.
Having the green focus confirmation light come on would be welcome, but the more I read about adapters with focus confirmation chips, the more confused I become.
For starters, is there a difference between so-called Dandelion chips and the others that claim to allow camera to confirm focus?
Something else that gives me the willies is the apparently complex process of programming the chip to one's camera based on manufacturers' instructions in bad English. What's worse - this arcane process must be done for each lens you'd want to use with the adapter! And, possibly re-done for different apertures.
Then, we have Fotodiox warning vaguely not to use such adapters with EOS FILM cameras, as they will muck up the computer or otherwise "damage" such cameras.
THUS - and please only answer if you've had FIRST HAND experience with chipped adapters and Canon EOS 5D MkIV - is there an adapter with confirmation chip that does NOT have to be "programmed" to the camera to allow focus confirmation when using MF Takumar M42 lenses on EOS digital AND film cameras.
Lastly, is it true that focus confirmation only works with certain f/ stops on a given lens?