mannetti21 wrote in post #16259640
No, but the price difference between the two lens doesn't match up with the improved sharpness and image quality, in my opinion. And again, In my opinion, if I already owned the 55-250, I wouldn't consider spending more money to move up to the 55-250. That money would be better spent/saved towards one of the Canon 70-200's or a 100-400. If I didn't already own a tele-zoom, and wanted to keep a tight budget, only then would I consider the Tamron 70-300.
On the tests I've seen on the Digital photo, the difference in sharpness between these two lenses is wide. The tamron is practically L lens quality, while the 55-250 is just your average telephoto zoom. The tamron is very comparable to the canon 70-300 L until you hit 300mm or close to it, then the difference in very noticeable. Until then they are practically identical. If you have an extra $250 to spend then the Tamron appears to be the way to go.
Btw, I've read from one reviewer that the Tamron doesn't do well on full frame cameras and that there was a lot of front and back focusing issues. Anyone have this problem?