You could also build in a lever to activate 'stop down' on the lens so
that the *ist D could meter properly on pre-A lenses. Then everybody
would be (almost) happy!
I had actually considered that it could have a mechanical-to-electronic
convertor built in, to allow full function from pre-A
: Peter Loveday [mailto:[EMAIL PROTECTED]
Sent: 08 October 2003 23:43
To: [EMAIL PROTECTED]
Subject: *istD teleconvertor idea
I was thinking about the *istD last night (which I seem to do
a lot of these days :), and thought of something; is it
possible to make a 0.67x TC for it? I'm not talking
, 2003 8:42 PM
To: [EMAIL PROTECTED]
Subject: Re: *istD teleconvertor idea
Now here is an interesting question. Would there be enough of a market
to make it worthwhile for someone to set up a company to retrofit
modified mounts on older Pentax lenses? Either one that has a manual
stopdown lever
Now here is an interesting question. Would there be enough of a market
to make it worthwhile for someone to set up a company to retrofit
modified mounts on older Pentax lenses? Either one that has a manual
stopdown lever, or better one that simulates an 'A mount. Now the
leaves the question
- Original Message -
From: J. C. O'Connell
Subject: RE: *istD teleconvertor idea
I think the opposite might happen. If the K/M lenses begin
to sell real cheap on the used market due to Pentax's
stupid failure to support, SOMEONE ELSE will make a K
mount DSLR, like sigma, ricoh
-Original Message-
From: William Robb [mailto:[EMAIL PROTECTED]
Sent: Thursday, October 09, 2003 10:49 PM
To: [EMAIL PROTECTED]
Subject: Re: *istD teleconvertor idea
- Original Message -
From: J. C. O'Connell
Subject: RE: *istD teleconvertor idea
I think the opposite
I had actually considered that it could have a mechanical-to-electronic
convertor built in, to allow full function from pre-A lenses, without even
needing stop down metering.
This wouldn't work because the pre-A lenses don't have a linear
apperture coupler, among other things.
-Scott
I don't see why not, after all that is all a retrofocus lens is, a
negative telephoto. As you say vignetting in the main lens is the
problem faced in full frame versions, but you might be able to get one
to work with a small sensor. The problem from a manufacture's viewpoint
is some idiot
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