get a clue what you talking about or everyone is lauging about you.
the canon 70-300mm L is optical and mechanical much better then the tamron.
if you have not enough money to buy the canon.. ok.... but donÂ´t make such stupid claims.
the EF 70-300mm non L is a more complicated topic.
but from my own tests the tamron is better in terms of sharpness, when you get a good one.
one problem i hear again and again from my nikon customers is that the tamron is underexposing.
my nikon customers complain about having to overexpose by 2/3 to 1 stop to get the same results as with other lenses.
Err, I think you're misreading the problem. It's being discussed on photozone and the issue appears to be that it meters for the Tamron wrong:http://forum.photozone.de/index.php?/topic/355-tamron-70-300-vc-exposure-issues/
... but there appears to be no consensus on why and what the exposure issues are.
The 30-second review on the back of the camera showed little that I could discern between the two
that one sentence says it all......
the images you posted for comparisation are completely worthless.
learn to make reproducibility test images or forget it.
Well, since you're so knowledgeable and seemingly have access to said lenses, why don't you post some examples?
FWIW, it's not a matter (for me) about whether I can afford the lens or not but rather what do I get for my money?
And that's the question that everyone should ask. In the face of the Tamron lens, is the Canon worth the $1100 premium? Without question if you use the lens to make money, yes (it's a capital equipment cost), but for non-professionals, what is the small incremental gain worth? And it is seemingly a small incremental gain..
FWIW, I've got two 70-300IS USMs but both are a source of great frustration. For landscape, when I can zoom, tripod mount and use live-view to focus, they work but in almost any other scenario, they fail.
But since you haven't pony'd up with any actual photos to argue your point and just intended to criticize, I'll reward your laziness with this URL:http://forum.photozone.de/index.php?/topic/641-tamron-af-sp-70-300mm-f40-56-di-vc-usd-for-canon-5d/