Hello! I have just realised a mistake in ordering some sheet film - I thought I was buying 5x7 and the seller has sent 13x18 sheet film ... even though I also bought 5x7 sheet film holders from him (and the film was advertised as 5x7!)
I appreciate that both 5x7 and 13x18cm holders can be used in 5x7 cameras ... my question is this - are the film holders (aka as "double dark slides" here in UK) exactly the same dimensions in particular the thickness of the holder?
Thanks Paul
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