>From: Moose <olymoose@xxxxxxxxxxxxxxx>
>
>>Carlos J. Santisteban Salinas wrote:
>>
>>Mountless Tamron Adaptall lenses behave in a similar way to Zuikos. Another
>>exception to the general rule are M42 auto diaphragm lenses (see below).
>>And Can*n FD lenses are the weirdest thing on earth, regarding to coupling
>>;-)
>>
>Well, those 3 types of mounts are the only ones I have used, except on
>very rare occasion, in years. I had forgotten that about Nik*n, but see
>that it is so when I drag one out and look.
I started with Pent*x-K, so the OM looked 'weird' to me :-)
>>>>From: Peter Klein <pklein@xxxxxxxxxx>
>>>>
>>>>The Pentax *ist D meters with MF M42 and "K"
>>>>lenses with a single button push. Pentax released a firmware upgrade that
>>>>stops the lens down when you push the "green button," meters, and then
>>>>opens up again. It also stops down for shooting. So you get an aperture
>>>>priority mode with one-touch metering........................
>>
>So Peter is right about K-mount, but not about M42?
I think Peter is right. The upgrade allows a 'stopped-down metering' mode
-- just like most M42 bodies with TTL metering did! I was just pointing to
the auto-iris operation, which is OK with Pent*x-K lenses (they share that
mechanism with their AF brothers) but *not available* with *adapted* M42
lenses, which should keep stopped down manually.
This reminds me of the two modes of the Kindai OM-EOS adapter (preset vs.
stop-down)
>I just tried this and got a similar result. I could easily take pics of
>anything in the dark garage with quick and easy AF lock.
[snip]
>I suggest that the problem is
>the nature of the subject, with the specular reflections off shiny body
>and glass surfaces confusing the AF.
That makes a lot of sense.
Speaking of AF... a nice thing on my first AF (the Ric*h GR-1) which I miss
a lot on the mju-II, was a set of icons in the viewfinder indicating the
approximate measured distance -- at least I knew when the AF was wrong (not
a rare event, BTW). I had much less chance of out-of-focus pictures with
the GR than the mju, but the GR did miss a lot of pictures while trying
once-and-again to get the AF 'right'.
Enjoy,
...
Carlos J. Santisteban
<cjss@xxxxxxxxxxxxx>
<http://cjss.galeon.com>
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