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Forum: Pentax SLR Lens Discussion
10-01-2010, 10:21 AM
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There is one other major difference between the HSM and the non-HSM version... and that would be the IF, Internal Focusing..and the size. It weighs the same as the non-HSM, but is only 3.5in long, where as the non-HSM is 5" not extended and is 6+" fully extended.
This would be benefical and make life easier if you're shooting with polarizers or graduated filters..
Then question is.. how much is quietness/HSM, size and internal focusing worth to you? as it is an extra 4-500 bucks for those features.
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