04-05-2011, 09:53 AM
I can only speak for the Sigma 17-70 f/2.8-4.5 as it's the only lens I have among these.
Most people say it's soft at 70mm f/4.5, but I beg to differ. Maybe my copy is exceptionally good?
Judge for yourself and tell me what you think. The pic below was taken at 70mm wide open (f/4.5) with a Pentax K10D:
100% crop:
I find it plenty sharp and definitely sharp enough for portraiture.
[quote name='Lars' timestamp='1301988877' post='7384']
Hi,
I am looking for a similar lens for my D7000 and have done some researches.
I found out (not my own experince):
- IQ of Sigma 2,8/17-50 OS far better than Sigma 2,8-4/17-70 OS at 50 and 70mm wide open
- all other settings: similar IQ
- IQ of Sigma 2,8/17-50 OS better than Tamron 2,8/17-50 VC
- IQ of Tamron 2,8/17-50 (non VC) better than Tamron 2,8/17-50 VC
- IQ of Tamron 2,8/17-50 (non VC) slightly better than Sigma 2,8/17-50 OS
So its up to you:
best IQ and price, but no OS/VR and suboptimal AF: Tamron 2,8/17-50 (non VC)
very good IQ, OS, very good AF, highest price: Sigma 2,8/17-50 OS
if you want to use 70mm for dreamy portraits, good price, OS: Sigma 2,8-4/17-70 OS
Lars
[/quote]
Most people say it's soft at 70mm f/4.5, but I beg to differ. Maybe my copy is exceptionally good?
Judge for yourself and tell me what you think. The pic below was taken at 70mm wide open (f/4.5) with a Pentax K10D:
100% crop:
I find it plenty sharp and definitely sharp enough for portraiture.
[quote name='Lars' timestamp='1301988877' post='7384']
Hi,
I am looking for a similar lens for my D7000 and have done some researches.
I found out (not my own experince):
- IQ of Sigma 2,8/17-50 OS far better than Sigma 2,8-4/17-70 OS at 50 and 70mm wide open
- all other settings: similar IQ
- IQ of Sigma 2,8/17-50 OS better than Tamron 2,8/17-50 VC
- IQ of Tamron 2,8/17-50 (non VC) better than Tamron 2,8/17-50 VC
- IQ of Tamron 2,8/17-50 (non VC) slightly better than Sigma 2,8/17-50 OS
So its up to you:
best IQ and price, but no OS/VR and suboptimal AF: Tamron 2,8/17-50 (non VC)
very good IQ, OS, very good AF, highest price: Sigma 2,8/17-50 OS
if you want to use 70mm for dreamy portraits, good price, OS: Sigma 2,8-4/17-70 OS
Lars
[/quote]