[pure-silver] Re: Efke 100 buckling


----- Original Message ----- From: "Kevin Halcrow" <crowks@xxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, August 24, 2005 1:23 PM
Subject: [pure-silver] Efke 100 buckling


With the all recent interest in Efke films, I'd like to raise a problem
I'm experiencing with my first attempts at enlarging 35mm
negatives of the ISO 100 version. This is a pronounced film
buckling that happens several seconds after my enlarger (Agfa
C66 [= Durst M605]) is switched on. The result is that the initial
sharp focus achieved with the lens wide open is quickly lost. The
degree of buckling is such that stopping down to f11 doesn't bring
the image into adequate focus. I've tried clamping the film more
tightly by putting a slide mount above the frame being enlarged but
this doesn't solve anything. I guess I could work around the
problem by switching on the enlarger with my hand over the lens
until the buckling has stabilized, then make the exposure but this
would be a real nuisance, particularly with split filtering. I don't get
any buckling when I enlarge ISO 25 negatives (or TMax 100). Any
suggestions?

Kevin Halcrow

I have this problem with several kinds of films in all sizes depending on the weather. One can either pre-heat the film before printing so that you focus when the film is "popped". I sometimes have to start the exposure using a black card over the lens as a shutter. The other cure is to use a glass negative holder. Glass holders yield the sharpest pictures but give you six surfaces (including the film) to keep clean instead of two.

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


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