I use one on my D90 a lot and am very pleased with it most of the time. Actually, I need to clarify that ... sometimes I let my technique slip or don't use a contrasty enough target to focus on and then it can be a bit hit and miss.
Having said that it's my go to lens for studio portrait and dim church shots. It is (like so many "fast" lenses) a tad soft fully open but you really don't see it unless pixel peeping or printing bigger than 8x10/A4.
I can't comment on the other lenses you're looking to compare against as I don't have either.
I have had both (just sold the 28-75mm yesterday) Tamrons on a cropped body. Both perform exceptionally well considering the cost of similar spec'd Canon/Nikon equivalent. I found the 28-75mm not wide enough so I tend to use the wider 17-50mm. The autofocus is a little annoying (on both) but most are happy to live with it. Can not comment on the Sigma (although I am after the OS version).
Thanks for the replies
I'm just considering one for studio use for photographing my 3 1/2 year old & family/friends.
Won't have lots of room in my garage when I set it up & wanted some zoom ability as well rather than prime lens.
Thanks for the replies
I'm just considering one for studio use for photographing my 3 1/2 year old & family/friends.
Won't have lots of room in my garage when I set it up & wanted some zoom ability as well rather than prime lens.
For those focal lengths you cannot do much better than the Tamron 28-75mm, and no better at all at the price.
Have a look at the SLRGear test graphs for this lens. Not much between it and the Nikon 24-70mm, though you obviously lose an important 4mm at the wide end.
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