[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


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