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Old Jun 28, 2009, 7:30 PM   #7
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Join Date: May 2008
Location: Winter Haven, Florida
Posts: 6,515

Hey Scott,
That's the reason I sent my Sigma 70-200 back and got the Bigma. but, for what its worth, Sigma tech told me the new TC with a serial number starting with 500xxx is compatible with the HSM and Pentax body. the bad news is they are $300 at B&H
I'm going to miss the fast 2.8 lens but, like you I need the zoom range more.
PS. this is more of a question than an argument concerning weight.
The info I have is the Sigma weighs, 1390g (49.0 oz) and the Tamron,1330g (46.9 oz)
That's just 2.1 oz difference. is that enough to make a notable difference when hand holding?

Life's a breeze on a Goldwing...

Last edited by Goldwinger; Jun 28, 2009 at 7:41 PM.
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