Re: Stop Down Metering on K, M, LX

[Gonz]

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?



------- End of Original Message -------