Re: Zeiss on Canon

Eric Stevens wrote:
Paul Furman wrote:
J. Clarke wrote:
Paul Furman wrote:
piterengel wrote:
Hi all. I've recently bought a Canon EOS 40D. I have a complete set
of Zeiss lenses, manual focus. I know there are adapters to mount
these lenses on 40D. I'm inetrested on using 60 macro on digital
camera and a guy in Italy has a "adapter ring with chip". He told me
that chip is for "say" to the body tha focus is ok. My answer is:
can I use 60 macro on 40D with this adapter?
Just curious, what mount were these lenses designed for? Didn't they
do mostly rangefinder & medium format lenses back in the day?
Zeiss made a wide range of lenses for Contax and Yashica SLRs starting around 1975.

The "chip" enables focus confirmation.
You shouldn't need a chip for focus confirmation. Not for Nikon anyways.

You do. That's the origin of the Nikon CPU lens.

The camera knows whether or not its focused but without a message sent
back by the lens it has no idea of the range at which it is focused.
The later Nikon cameras use that information for some of the things
they do with exposure.

OK, yeah, that's for ttl flash metering. The bigger reason for Nikon chipping of old lenses is that many Nikon models will refuse to meter at all without a chip on the lens, but it's my understanding all Canon models will meter with any lens (maybe not ttl flash metering though).

There are some other issues with knowing the max aperture (assuming you have an aperture linkage, not doing stop-down) where there's a little adjustment made for vignetting on fast lenses, and this is given as a reason not to allow 3D matrix metering but I think that's BS. Most of the chipping as I understand involves throwing any random cpu from an old broken lens in there to fool the camera. This isn't really going to give useful information but as I said, it doesn't matter that much and generally works fine... maybe a little exposure compensation needed when shooting wide open on a fast lens.


While that's a nice feature, if one is going to primarily be using Zeiss manual focus glass I'd bite the bullet for the KatzEye split prism/microprism screen http://www.katzeyeoptics.com/item--Canon-40D-Focusing-Screen--prod_40D.html.

--
Paul Furman
www.edgehill.net
www.baynatives.com

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