[pure-silver] Re: Large Format Tilt
- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 29 Nov 2007 15:52:59 -0400
Forgot to mention (before Richard pounces)...in reality all of the distances
regarding the lens are measured from the entrance and exit pupils of the
lens which are not necessarily the same as the physical surfaces of the
lens.
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of BOB KISS
Sent: Thursday, November 29, 2007 3:46 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Large Format Tilt
My 2 cents.
I have never seen tilting the lens (front) affect the perspective in
any way whether at pictorial (subject to lens distance greater than 10X the
focal length) or in macro situations. The back is what adjusts perspective
and, of course, does change focus. Standard procedure has been to set the
back to get the perspective you want then adjust the front to put into focus
those objects on or near the "plane of interest". I believe Jim did mention
that this can put you near the edge of the image circle.
Also, at pictorial distances there is the 1/3 - 2/3 approximation
for depth of field (1/3 of the DOF between the lens and subject plane, 2/3
of the DOF behind the subject plane). However, in the macro region as you
increase magnification (reduce the lens to subject dx) proportionally less
and less of the DOF is between the subject plane and lens and more and more
is behind the subject plane. In macro situations I focus closer to the
closest object I want in focus but all of the above is confirmed with a lupe
on the ground glass a really DARK dark cloth so that I can still see the
image when stopped down.
Just my 2 cents.
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Brick
Sent: Thursday, November 29, 2007 2:54 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Large Format Tilt
>C.Breukel@xxxxxxx wrote:
>>Back focussing is the same as front focussing?
I find back tilt to be much better than front tilt for the majority
of situations. The reason is that the film stays in the center of the
lens's image circle. You can use back tilt with very wide angle
lenses and get no cutoff. You cannot use front tilt with wide angle lenses.
Therefore, I have gotten accustomed to using back tilt because I have
both 55mm & 75mm lenses for my 4x5 and with back tilt, I can tilt
'till the cows come home without ever leaving the image circle.
It's a little more cumbersome since the dark cloth and the GG are
also on the back standard, but with a little practice, you soon
overcome the cumbersomeness.
:-)
Jim
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