I already have the R72 IR filter for the other lenses, so I would rather use them, beside, it is too hard to focus, then attach the filter and try and take the photo. With the Leica and the Rollei, I am not looking through the filter to focus and or frame the subject. It's enough of a problem remembering to take off the lens cap. I don't want to have to lose a filter. I have a 77mm red 25, but it doesn't filter out all the visible light.
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