I did a quick search of the forum but I didn't see this. My apologies if this has been beaten to death already.

I have a number of large format lenses. (which I use on a Calumet CC400 and a B&J Grover 8x10) Some of them lack any sort of filter threads, and the rest are all of different filter sizes. As a result, I tend to hold a needed filter over the lens during a shot, or not use filters at all.

Has anyone tried one of these as a DIY lens shade/filter holder?
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Cheers,
Tom