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08-08-2009, 09:32 AM   #1
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Sigma 70-200 HSM with Sigma 1.4 TC

Can I expect the above setup to work as well (IQ wise) as the Sigma 100-300 F4?
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08-08-2009, 04:24 PM   #2
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When you said " IQ wise " you are pointing out the fact you already know the 1.4x doesn't do HSM?
I am looking for a reasonable priced TC for my 70-200 that will work with HSM. I have a Promaster 1.7X with the contacts and runs the motor, however, it won't catch focus. Strange.
08-09-2009, 08:28 AM   #3
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C'mon. There is a reason why the 70-200mm+ 1.4X sigma TC are $1000 combined and the Sigma 100-300mm is $1300. It is simply a better lens. Plus, considering that the 70-200mm performs worse than the 100-300mm even without a TC, why would adding a TC make it perform better, although this is only my thoughts and you should really hear from Lowell who seems to have great results with his 70-200mm.
08-09-2009, 09:11 AM   #4
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The Tamron 70-200 + 1.4x TC combo works, though it is not HSM, and gives decent results, surely not to the standard of the 100-300, but good nonetheless.

I've personally found no appreciable loss in sharpness comparing images taken with and without the TC with the Tammy 70-200.

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