[pure-silver] Re: [OT] Filmholders, Septums, Total-Disasters
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 25 Nov 2005 13:33:24 -0800
----- Original Message -----
From: "John Black" <jblack@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, November 25, 2005 12:10 PM
Subject: [pure-silver] Re: [OT] Filmholders, Septums,
Total-Disasters
>
Check with Linhof to find out for certain. The U.S.
distributor for Linhof is very knowledible and might
answer
the question for you even through you are not here. Ask
for
Bob Salomon. HP marketing is at:
http://www.hpmarketingcorp.com/
FWIW, my Linhof TechniKa IVb (6X9) from the late 50s (I
think) was supplied
with a GG focusing back withOUT fresnel lens.
JB
I think they supplied both kinds at various times. Its
easy enough to check the GG position using a depth
micrometer. Remove the back from the camera, the focusing
panel is enough. The focusing panel will have a reference
surface that contacts the inside back of the camera in the
same place that film holders do. Use a flat sheet of metal
thick enough not to warp, it must be uniform and flat on
both sides and must be large enough to contact all four
corners of the panel. Drill a some holes to clear the probe
of the depth micrometer. Just at the center is OK but its
better to be able to check at the center and corners.
Measure its thickness with the micrometer so you can
subtract it from the readings. Then lay it on the back and
check the distance to the GG surface. The standard distance
is 0.190 inches. If there is supposed to be something else
there it will be significantly off. I don't know the exact
thickness of the Fresnel used by Linhof but they are
typically around 1/16th inch or maybe 1 mm in thickness.
This is a major error in position for the GG so it will be
pretty obvious.
The reason for having a test block that contacts all four
corners of the ground glass panel is that most GG panels
contact the camera back only at the corners. This leaves an
air gap around the GG to vent the bellows when focusing or
folding the camera.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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- » [pure-silver] Re: [OT] Filmholders, Septums, Total-Disasters
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