Tamron 17-55 ...

[copikau]

I understand that there's 2 different kind of lense type.
The new lense comes with Built-in-Motor. The other one .. not that sure.
In terms of PQ and sharpness, which one of this two gives overall performance ...

[Shin Howard]

I think you are talking abt the Tamron 17-50 f2.8 right?
For the 1 with built-in motor is for Nikon DX camera if I'm not wrong.

[copikau]

Yes ... Tamron 17-50 f2.8 DX.

[Octarine]

It's 17-50 only. The official name is AF17-50mm F/2.8 Di-II LD Aspherical
Check here for the details regarding Nikon mount: http://www.tamron.com/about/updates_nikon.asp There are two versions of the same lens, one with built-in AF motor and one without any AF motor. Depending on your model of Nikon camera you need to select the right model, otherwise you are restricted to manual focus.
If the difference is only the AF motor why do you suspect differences in the performance? Check the usual review pages and see if they report anything.

[canik7]

I have the same question since reviews done are probably on the old version. I wouldn't rule out that the MTF and the rest will be the same since mechanically there will be some changes to insert a motor.

[copikau]

have read few reviews for I can't recall where.
and most of them users prefer more to the old version rather than the one
with in built-in-motor.

is there any CSers using the old lense of 17-50 f2.8 ? ...

[Blur Shadow]

I have used both versions. Other than the focusing speed (the one with the built-in motor is slower), I have not noticed any difference in IQ or sharpness.

[copikau]

humm ... no difference in IQ ... does your pictures abit on the soft side ?

[Pokka]

Try googling for tamron 17-50 review. Lots of review on the internet. : )

Else, drop by any of the reputation camera shops. The ppl there will be more than happy to talk to you and answer your queries.

[Blur Shadow]

Originally Posted by copikau humm ... no difference in IQ ... does your pictures abit on the soft side ?

Slight softness observed in the corners. Slight vignetting as well, when shooting at f/2.8. For both lenses. But I can live with it. Never really compared the 2 though.

[copikau]

Quote: Blur Shadow : Slight softness observed in the corners. Slight vignetting as well, when shooting at f/2.8. For both lenses. But I can live with it. Never really compared the 2 though.

thanks Blur Shadow.
Been thinkin bout this lense so very long ...