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09-01-2018, 07:58 PM   #31
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QuoteOriginally posted by Rondec Quote
The Pentax 24-70 f2.8 uses 82mm filters (they aren't cheap) and the DA *16-50 takes 77mm filters. Not sure how this would be so much smaller. I don't think your math quite works. (The DA 15 f4 is 49mm filter).
The formula I used is the minimum for the outer element size. Obviously there are other factors that go into it. It's far too simplistic to account for zooms or wide-angle primes, but it works well for telephoto primes.

The point was that 200mm was an incredible estimate that had no basis in reality.


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