Only the prewar 35mm Biogon and its East German counterpart will cause problems. Not sure about the Soviet version (which is a copy of the East German lens, which is pretty much the same as the prewar lens).
If you search the archives, you'll see a thread where we explained how to tighten the flanges so that it will lock into place more securely once extended.
steamer said:
Thanks Mike
I seem to collapse it accidently often, so I was a little worried, now I will use it with confidence
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