Aha, really?
But max aperture on the lens is f/5...Lessens at higher lengths of course but...
Found a nice review IQ looks pretty good from the lab tests
http://www.lensrentals.com/blog/2014/01/tamron-150-600-telezoom-shootout
Yep, will speak to Wex tomorrow but I can't keep it like this. I hope it's just this one lens and they can replace it when they get more in but my worry is that it's a design fault?
Actually no I haven't! Thought I did but I haven't got that on it. Have now.
That said, it can focus, just sometimes it chooses not to!
FWIW does the same on 7D...
How brutal!Come on folks, just accept it - the lens has a fault lol...
I saw this review on it earlier
http://www.ephotozine.com/article/tamron-sp-150-600mm-f-5-6-3-di-vc-usd-lens-review-23866
A couple of people have reported that it goes from f5.6 to f6.3 just after the 400mm mark.any idea of the aperture at 400mm? (f5 at 150mm - f6.3 at 600mm : hopefully its 5.6 same as canon 400mm, this would make it a lens I would consider)
Just finished reading a very favorable review here, Dustin Abbott: http://dustinabbott.net/2014/01/tamron-sp-150-600mm-f5-6-3-di-vc-usd-review/
When reading it, I couldn't help wondering, why it's so cheap?
And then he finishes off with: "I personally wonder if they are not selling this lens at a loss to drive brand recognition. It’s that good."![]()
I simply don’t have the budget to purchase many of the super-teles that cover this focal range, and furthermore, I don’t shoot this style of photography often enough to justify the expense even if I did.

You will not see many decent BIF from this lens Jeff (other than a few slow flyers and the odd shot of faster birds) - there is no way a zoom lens like this is going to be up to the 400/5.6 for BIF. Even the 100-400 is no where near as good as the prime in this department.If you defo want a lens that will capture fast flyers then I would forget the Tammy altogether. For people that already have a decent birding lens the only reasons to upgrade as I see it is if you must have the extra focal length or if you have one of the big superteles and want a lighter weight lens as well. For the extra focal length its a case of comparing something like the 400/5.6 + 1.4x tc again the Tammy. I have seen one comparison between the 150-600 and the 400/5.6 but the pics were so poor that I discounted that one right away (like most other folk on the forum did).whats still missing is b.i.f pics in quantity and quality ,given that if i went for this it would be a case of having to sell my 400mm f5.6 i honestly don't think its worth the gamble
Reading his text seems honest enough. Good - and many! - shots speaks their own language......makes you wonder what credence you can give to the review?![]()
Hi Roy, I don't suppose you can share the link to this comparison? I'd be very interested in seeing the difference between the tamron & a quality prime.I have seen one comparison between the 150-600 and the 400/5.6 but the pics were so poor that I discounted that one right away (like most other folk on the forum did).
It was on one of the Japanese sites several weeks ago now Graham, after the first test the guy then said he had forgot to take a cheap UV filter off the 400/5.6. He then did it again but admitted there was probably a problem with his 400/5.6!!!!!. Everyone including me dismissed the test as the Japanese guy obviously did not have a clue what he was doing. The 400/5.6 shots were absolutely appalling so everyone knew there was something wrong with the test.Hi Roy, I don't suppose you can share the link to this comparison? I'd be very interested in seeing the difference between the tamron & a quality prime.
Thanks Roy. If I'm going to pay out for this lens I will wait until I see some of the big sites review it, it will also be nice to see the DxO Mark score too!It was on one of the Japanese sites several weeks ago now Graham, after the first test the guy then said he had forgot to take a cheap UV filter off the 400/5.6. He then did it again but admitted there was probably a problem with his 400/5.6!!!!!. Everyone including me dismissed the test as the Japanese guy obviously did not have a clue what he was doing. The 400/5.6 shots were absolutely appalling so everyone knew there was something wrong with the test.
I did see some comparison shots by a good US photographer who compared the 150-600 against the Sigma 120-300/2.8 + 2x tc (not the latest sports version) and the Siggy was significantly better, so much so that he decided there must be something wrong with the Tammy and has returned it. I am still waiting for a good photographer to compare the 400/5.6 + 1.4x tc v the Tammy but from everything I have seen thus far the Tammy does not yield the same amount of detail that the Canon does at 560mm.
The only decent detail bird shots I have seen from the tammy have been when the bird was almost filling the frame and even then the Tammy was not at the full 600mm. With a lens like the Canon 400/5.6 you can crop heavily and still get good detail.