I found a collection of filters for black-and-white (yellow, red, orange, etc), and each one is 46mm. I cannot remember what lens I bought these for. My first view camera was a Calumet that I bought in the early 1980s, and it came with a Caltar 210mm compact lens (tessar type). I no longer have that lens (sadly) and was wondering if it took 46mm filters. I think these 46mm filters fit my Pentax spot meter (the kind with the needle), but I don't believe I would have purchased filters just to use with my spot meter. Does anyone know if there is a large format lens that uses 46mm filters? I'm guessing I bought them for the Caltar, but when I researched that lens online, I learned they take 49mm filters.
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