Rick,
Check this link out. Shows someone has actually tested the Tamrons with
charts.
I think it will help explain what I have been saying.
http://homepages.ihug.com.au/~parsog/Guy/testteleconverter.html
For those that really need to have the Canon logo,
I will sell you a Canon label you can place over the word Tamron for a
reasonable fee. ;-)
Regards,
Peter K
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