Forum: Pentax SLR Lens Discussion
04-24-2015, 01:54 PM
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Humor aside (for a moment), I read somewhere that 7 is considered very lucky in Japan and having a 77mm FL was in part due to this... The digits of the 43 add up to 7 and 31 is (3+1)*7 + 3*1.
There you go.
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