Most useless photographic accessory

reddesert said:

I don't know what the Linhof filter holder looks like, but a thing you can use for lenses without a filter thread like those older Ilex-Calumets, is a spring tension clamp gel filter holder with a 2-barndoor hood. The one I know is called a "Voss gel filter holder" like this: https://www.ebay.com/itm/235439128743

It holds 3x3" gels, but you may be able to slide a Cokin filter or similar into it. I have one of these. It doesn't fit this thread because it is cheap and occasionally useful - most usable solution for odd-size clamp-on hood that I know of. Pic from the ebay auction for posterity:

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