Tibor Marcinek wrote:
> I am experimenting with a home-made reversal ring for my 28-70
> MkII.
Ah, very interesting. I presume you used an extension ring for the bayonet?
> Q1: Has anyone any experience in this kind of technology? Any
> comments as to (for instance) picture quality, applicability...(?)
Novoflex makes such a reversal ring called EOS-RETRO, and they recommend the
EF 28-105 zoom lens for use with it. Personally I would rather use a prime
lens, but the 28-70 should do.
> Q2: Can I attribute the failure to imperfections in connection? Is EF
> mount really so sensitive to resistance variations?
The Novoflex system uses a rather long spiral cord for the connection
between camera and lens mount. But the EF uses a serial protocol,so you
should use shielded cables.
> Q3: Do I need to connect all 8 (7) contacts if I am concerned just in
> the transfer of f stops and diaphragm control? Is there any available
> resource where to find details on EF mount ("which contact does
> what")?
Have a look at http://www.a1.nl/phomepag/markerink/eos_prot.htm
> Perhaps my questions sound too technical; I will appreciate any
> comments. Thank you.
I have also thought of building such a reverse ring for use on my old M42
bellows. Just keep us informed about your progress!
Marcus
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