On Dec 13, 2009, at 11:25 PM, Boris Liberman wrote:
Larry Colen wrote:
Have you carefully calibrated the focusing screen with all of your
lenses?
You may have just noticed it with the 1.2 because of the shallow
DoF.
On Mon, Dec 14, 2009 at 9:08 AM, Derby Chang <[email protected]>
wrote:
Yvon has this nifty chart you can download and print on card. Won't
solve
your problem but you can quantify it.
http://pentaxdslrs.blogspot.com/2008/06/part-1-autofocus-adjustment-for-pentax.html
I hear you. I've downloaded the charts. I am going to print them and
try to measure my problem. Now - what do I do to effectively solve it?
My conundrum here is that the lens is manual focus - so that
everything here is purely mechanical - the lens, the focusing screen,
the camera - no electronics involved. So what kind of solution am I
looking for?
I think that this means that the focusing screen is not properly
calibrated. I ran into this problem on my K20D. Rachel Katz said that
with the K20s, the number of miscalibrated screens went way up. In my
case, they had measured the necessary shim for the focusing screen
then accidentally put two of them in. At least I assume that is what
happened because when I took out one of the focusing screens it was
right on.
My suggestion is to try it with several lenses, wide open and as close
as the lens will focus to minimize depth of field. If you can, also
test it with the lens on auto focus while you're at it.
Write which lens and auto or manual on a small card that you put in
each shot so you can tell what is going on when you look at the
pictures.
--
Boris
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Larry Colen [email protected] sent from i4est
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