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06-09-2008, 10:26 AM   #1
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Why is the Tamron 90mm Macro two inches too long?

Have just received the Tamron 90mm Macro from qdoan. Amazingly sharp lens. The front glass sits 2 inches deep into the barrel which makes me curious. It comes with a separate hood so that part isn't really there as built-in hood, Tamron could have made the barrel 2 inches shorter without affecting the optics design. Thanks for any explanation why it's made that way.

06-09-2008, 10:52 AM   #2
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Focus all the way down to max macro. The lens gets much much longer. I'm guessing here, the extra barrel length has to store somewhere: the deep front section. Having that extra length in a single piece makes the lens more stable and solid when at full macro extension.
06-09-2008, 09:52 PM   #3
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QuoteOriginally posted by Nesster Quote
Focus all the way down to max macro. The lens gets much much longer. I'm guessing here, the extra barrel length has to store somewhere: the deep front section. Having that extra length in a single piece makes the lens more stable and solid when at full macro extension.
You are 100% correct.
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