I've got a bit of a quandary.
I have an excellent collection of 77mm filters that I use across formats. I have two LF lenses that don't take conventional threaded filters (Heliar 210mm f4.5 and Imagon 250mm f5.8). I'd love to find a way to use my 77 filters on them aside from gaff tape - anybody know of a way to mount a threaded filter in front of these lenses? I use step-up rings on all my other lenses, but that doesn't seem to be an option here... the Heliar and Imagon were (unfortunately) both designed to be used with slip-on filters.
For what it is worth I am using a Sinar P and Sinar Norma. I had initially had hopes that the Sinar filter system could work with adapters, but that doesn't seem to be the case (the filter rings only allow mounting the Sinar filter holder ONTO a threaded lens, but not vice versa.
If anybody has any insight that would be amazing - I use my 77mm's a lot with smaller format lenses and I'd love to be able to just keep one set for everything. Since I use the Heliar and Imagon for portraits in particular, having access to the filters is a big plus for me on them.
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