[pure-silver] Re: Large Format Tilt
----- Original Message ----- From: "Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, November 29, 2007 10:17 AM
Subject: [pure-silver] Re: Large Format Tilt



From: <C.Breukel@xxxxxxx>

My question still stands:
Back focussing is the same as front focussing?
It is, but only at far distances where lens-to-subject > ~10x the focal length. 

At near distances the back-subject distance is set first
for the desired magnification and then the lens position
is adjusted for focus.  It is easy to remember the order:
it is the same as with an enlarger.  For fun, try doing
it backwards...

With cameras that twist into pretzels, like Sinars,
with appropriate twisting there can be quite a difference
between front and back focus - though both will drive you equally mad. 

==
Nicholas O. Lindan
Cleveland Engineering Design, LLC
Cleveland, Ohio 44121



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