With lenses that take a large filter, can a glass filter be screwed on the rear element? I am interested particularly in the Sironar S 240mm, which takes an 86m m filter. If not, is there a convenient way to mount filters, including gel, on the rear. I have tried a rear gel mount from Calumet, but it needs to be permane ntly attached to the lensboard, and each lens would need one, which gets expensi ve.
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