[pure-silver] Large Format Tilt
- From: <C.Breukel@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 29 Nov 2007 14:48:28 +0100
Since the list is pretty quit I thought I might ask a bit off topic
question.
I have been playing with Bob Wheeler's VadeMecum
(http://www.bobwheeler.com/photo/Software/software.html), which is a set
of usefull programs for the (LF) photographer which runs oa on a Palm
device. You'll need a certain amount of basic knowledge of LF techniquet
understand the programs.
It is nice to play around with it, I am less certain if I would use it
in the field, we will see.
Anyway the program I like the most is called Tiltb, this program helps
you to find the amount of tilt (in degrees or top movement) needed to
get something in front of (A), and something at the back (B) higher up
in focus.It is based (not novel) on measuring, by back focusing the
difference between A and B on the rail, and the difference between A and
B on the groundglass. Both distances and the distance from the camera to
the tilted plane are fed into the TiltB program, which gives you the
degree tilt or the amount of topmovement of the front standard.
Since I use mainly an old Linhof Technika III in the field, I cannot use
back focus (it hasn't), but I assume I can use front focus for that,
right?
A more difficult part is how to measure the amount of top movement. A
Tech III has no front tilt, only back tilt. A way around this is to do
back tilt, and drop the bed (making front and back parralel again, and a
front raise. So now the back tilt is turned into a front tilt.
I now measure the amount of top movement by measuring from the back
panel (actually box), somehow I have the feeling that this is not
entirely correct.
OTOH I did some testing of this procedure in my living room, and the
resulting tilted plane nicely brought the desired subjects in focus,
have to print the negatives yet though,
Best,
Cor
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