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11-04-2010, 03:15 PM   #31
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QuoteOriginally posted by Tommot1965 Quote
thanks for the advice on the TC..that puts that idea out of the equation. ive only used TC's on manual lens and have never had experience with AF and TC...cheers
I bought the Tamron 70-200mm specifically for dual use, both without a teleconverter for indoor and people shots, and with a teleconverter for airshows. I have three PZ-AF teleconverters, the 1.5x Kenko, 1.7x Promaster, and 2x Tokina (which appears to be a rebranded Kenko). The one airshow I've shot I was happy with the results of the 1.5x Kenko. Sharpness was very good, and no excessive chromatic aberration (in fact it was far below what I would have seen with the Tamron 70-300mm f/4-5.6). I think the effective 100-300mm f/4 works well for shooting an airshow. I think it would have been potentially useful to have the extra reach of the 1.7x, however I had issues with getting a sure focus lock on some objects with that teleconverter, so I had to go to the 1.5x, which didn't give me any trouble and I shot with for most of the day. I haven't tried the 2x yet, but I expect it will only useful in manual focus situations or perhaps specific subjects in specific lighting situations with certain lenses. I wouldn't discount the use of a 1.4x or 1.5x teleconverter with a lens like the Tamron 70-200mm f/2.8.

11-08-2010, 04:02 AM   #32
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ended up with a 70-200 HSM II sigma...go was a good price and will do me until I can buy the optically superior Sigma OS 70-200

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