Question to the group: I'd like to get a fairly modern 300-305mm lens that takes a 67mm filter, as almost all my other lenses are set up for that size. I have a Caltar II-N (aka Apo-Sironar-N), but it takes 86mm filters, and I just can't see buying and carrying a whole `nother set in that size. Prefer at least f/6.8 or brighter. Thoughts? Thanks!
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