John Whittingham wrote:
Not sure what you mean by that. What does faking stop down metering to do a test have to do with handheld metering?
Well if you cannot trust open aperture metering and feel it nescessary to use the lens stopped down for accuracy then who's to say how the camera would perform when set to the exposure reading from an external meter? You have to have some faith in the equipment you use, don't you?
I do trust it. Someone was trying to do a comparison, that is all.
John
---------- Original Message ----------- From: Gonz <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Sent: Thu, 04 Nov 2004 21:44:31 -0600 Subject: Re: Stop Down Metering on K, M, LX
Not sure what you mean by that. What does faking stop down metering to do a test have to do with handheld metering? Handheld metering is always going to be useful, especially incident metering. We were trying to find a way to fake a K-body into using a K-mount lens like a screwmount would behave on the body, i.e. the aperture set would look like it was wide open so that there would be no inaccuracy in the stop down mechanism.
[EMAIL PROTECTED] wrote:
Makes a complete nonsense of using a handheld meter then!!!!!!!!!!!!!
John
---------- Original Message ----------- From: Gonz <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Sent: Thu, 04 Nov 2004 16:45:10 -0600 Subject: Re: Stop Down Metering on K, M, LX
Hmmm. You may be right on that, since normal K mount cameras may depend on this, whereas the *istD does not have it. I'll have to test this and report my results.
rg
Don Sanderson wrote:
This will work for the aperture but I believe it will also throw the cameras meter way off. When not fully seated the lever that reports how many stops from full open the lens is set won't be in the correct position. 1/8 of a turn could be several stops.
Don
-----Original Message----- From: Gonz [mailto:[EMAIL PROTECTED] Sent: Thursday, November 04, 2004 3:22 PM To: [EMAIL PROTECTED] Subject: Re: Stop Down Metering on K, M, LX
Shel Belinkoff wrote:
Hi Christian,
A couple of reasons. First, a week or so back JCO made the
assertion that
by metering thru a lens set at the taking aperture, measuring the
actual
light transited rather than having the camera essentially calculate the exposure, would result in a more accurate, or precise,
exposure. I'd like
to see if there's any truth to that, and if there's any practical difference.
My guess would be that the difference would be so tiny as to be insignificant. Esp with film since there is so much latitude.
But if you are really interested in testing this, an interesting way to do this would be to use Mark's trick with the *istD, that is, mount the lens so that it is not fully locked, to a position such that the lever that keeps the aperture wide open is not engaged. I believe he said it was about 1/8 of a turn or so, but check with him. This is ok for tests like you want to do, but I would not recommend this for everyday shooting, as the lens is in somewhat of a precarious situation not fully locked in and could fall off.
Also, I want to compare two similar lenses, one being a Super
Tak that can
only be used stopped down on K bodies and the other being a K
mount version
of the lens. It would seem that if the metering styles used
were the same
(assuming there IS any difference as suggested by JCO), the comparison between the two lenses may be more accurate.
However, I doubt that I'd want to shoot that way when making regular photographs.
Oh, there's a third reason: I've just a little too much time
on my hands
right now <LOL>
Shel
[Original Message] From: Christian <[EMAIL PROTECTED]>
Is there a way to use a K-mount lens on the K, M, or LX bodies with
stop
down metering instead of having to use open aperture?
Just a silly question, and forgive my ignorance, but why would you
want
to?
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