Back- focusing Tamron 70-200 f/2.8
I purchased this lens new a few months ago, but have only begun to use it in low light, i.e. f/2.8, conditions. It's quite obvious that the lens has a serious back focusing problem, and as I'm still shooting with a K10D I have no way of correcting this myself. I guess my question has to do with how much correction can be done in the lens, as in sending it back to Tamron, and how much can be done in camera, as in upgrading to a new K-7. I'm giving serious thought to upgrading, but after downloading RAW files from Imaging Resources and running them through Imagenomics noiseware pro I confess that I'm leaning toward the new EOS 7D which, in my opinion, has at least one stop better high ISO performance. Moreover, most of the reviews I have read say that although the K-7 has improved AF performance it's still not up to par with the Canikons. High ISO performance and continuous autofocus tracking are the two main criteria in my deliberations. I can't see buying a K-7 just to correct this one lens which I'd like to keep along with my K10D, and for a while at least, be a two system shooter. I'm interested in the experience of those of you who have dealt with this problem through Tamron service. Thank you.
CN
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