[pure-silver] Re: Large Format Tilt
----- Original Message ----- From: "Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, November 30, 2007 2:07 PM
Subject: [pure-silver] Re: Large Format Tilt



"Richard Knoppow" <dickburk@xxxxxxxxxxxxx>

"Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx>
> At near distances the back-subject distance is set > first > for the desired magnification and then the lens > position 
> is adjusted for focus.



I'm not sure you meant the above.


How do you set up your enlarger?  I move the enlarger
to about the right place, focus, and then iterate as
needed.

I don't start by moving the lens into position first
and holding it there while adjusting the negative and head... then moving the lens again, holding it and moving the negative 
again.
Ditto a view camera. If it's 1:1 I put the film plane 4x the focal length from the subject and focus, then oooch as needed.
What is happening with the enlarger is that the image and object fields are reversed from their camera position. The longest distance is equivalent to the object field, this is usuallyl where the paper goes in an enlarger, so, you are focusing the lens but it is similar to the situation with a camera at some distance from the subject. Also, if you are making a low magnification print you wind up doing what you must with a camera that does not have back focus namely moving the entire camera to focus and then adjusting the lens position to obtain the desired magnification. If you have back focus on a view camera and don't use it for focusing you are creating a lot of extra work. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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