Cory Papenfuss wrote: >>> IMO, a perfect example of Canon just plain being evil. I never >>> realized how much I subconsciously used the focus confirmation on my MF >>> lenses with my -DS until I tried using some on my friend's RebelXT. >>> Between the bad viewfinder and lack of focus confirmation, it's extremely >>> difficult to focus MF lenses. >>> >>> -Cory >>> >> Actually it's merely an example of how the Canon AF system works. A fair >> bit of the AF processing in the Canon's is in the lens, so without a >> lens chip, no AF as you don't have the full AF system present, this is >> why issues will come up with Canon with some lenses having improved AF >> algorithms. Pentax and Nikon do everything in-camera and rely on the >> lens only for data (max aperture, focal length and focused distance[the >> last if available]) >> >> -Adam >> > Really? Well honk my hooter... I wasn't aware of that. I can see > how the body needs to know some things for AF, but it seems weird to > actually put *processing* in the lens. A camera body has as many or more > AF variables in it than the lens does (number of AF sensors, matrix > metering algorithms, etc). Seems like there should be a fall-back. > > Oh well... if that's true then I stand informed. Not necessarily > corrected since Canon is still evil... :) > > -Cory >
Well, I should be more specific, the actual processing is in-camera, but some of the algorithms are stored in the lens firmware and are lens specific (I wrote the above before coffee #1). Ergh my bad. -Adam -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
