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I know, who cares right? Only those of us with a 2000mm Reflex and no lens cap.
I found this auction:
vintage Asahi Pentax huge leather lens cap for Super Takumar 1000mm lens?
Seller says "inner dia.180mm" which is a perfect match for the 2000mm. I don't think any other Pentax lens is a match.
Anyway, super excited to finally have a lens cap for this whale of a lens.