Originally posted by tcdk The old version K-Mount of the Sigma 17-70 is my main lens and has been for more then five years. Would be the first thing I buy if I ever switch systems.
I had the Tamron 70-300 in Kmount and replaced with the 55-300 Pentax, as the Tamron has to much fringing on between 200-300
Thanks for the inputs. I am going for the OS version of the sigma hoping that the Optical stabilization will help me on the normal use of the Sigma zoom. I love the older version of the Sigma zoom as I find it
my best favorable 1-lens choice in doing it most for my needs in Pentax. The OS version do get some favorable reviews by Nikon users, some like it over the Nikon 16-85mm f/3.5-5.6 with VR which I find to be slower to use for walk-around and traveling.
Regarding the Tamron 70-300mm f/4.0-5.6
VC lens, it has Vibration Control from Tamron and it goes with ultrasonic motor.
Ephotozine has a review on this lens and it does mention reasonable CA control. And I am in favor of this lens for FX compatibility, need to confirm though.
I am quite sure if I go to the Nikon forums, most people will pick #2 choices with Nikon lenses.
Thanks,
Hin