Barry, all Pentax DSLRs allow stop-down metering with K and M lenses.
P/K adapter falls in that category. Depending on your camera you may
have to consult user manual for specifics. Therefore, in principle P/K
adapter is good for you.
Personally, I found metering of /my/ K10D in stop-down mode rather
unreliable and opted not to have any pre KA-mount lenses. Thus, I
haven't had a chance to try K-7 with this regard.
I don't know of there is adaptall m43 (I take it you refer to micro 4/3
system here) adapter, but there might be and surely it is worth the try.
Theoretically, it is known that K-m43 adapter does exist and you may
want to mount your adaptall lens with P/KA adapter on K-m43 adapter for
use with m43 bodies. Theoretically it could work. But I haven't tried it
'cause I've no m43 cameras. May be Godfrey and others on the list who
have these cameras can give more useful insight.
Boris
On 12/28/2010 8:31 AM, Barry Rice wrote:
Hey Boris
OK, some more back story. I love my 90mm so much, that about 8 years ago I
bought a second one for the day that something happened to my first one. I
even bought an adaptall for it, but for some damnable reason I didn't
assemble the two to make sure they worked.
(I know what you're thinking--this is the exact same reason the problem with
the Hubble Space Telescope wasn't noticed until after launch.)
It turns out the adaptall that I bought was just a P/K, and not a P/KA.
So, now I'm in the market for TWO adapters. I just bought one on eBay--it is
supposedly coming my way from the UK.
But I'm wondering if there's a new technology--that's the source of my
curiosity regarding the M43 mount.
Barry Rice, Ph.D.
Carnivorous Plant FAQ
sarracenia.com
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