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04-24-2011, 05:18 PM   #1
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sigma 17-70 vs sigma 17-70?

was checking out the sigma canada website and the lens I bought a few years back seems to have been updated. does anyone know if it takes better shots then the older model? 17-70 2.8-4.5 macro
it also claims you can use the built in image stabilization in the lens with the pentax body image stabilization for better results.
true?
has anyone compared?
great lens except a bit slow at the max zoom and a little soft at fully open

thanks

04-25-2011, 12:51 AM   #2
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I don't know if the glass itself has been improved but the OS may be an improvement. I say maybe since with a lens with a shorter range, camera shake is more than adequately controlled by the sensor anti shake system.

Assume that you get a two stop improvement with the camera system, using the 1/FL rule of thumb, you can slow down to 1/15 - 1/30 with the lens set at 70mm and get a blur free shot.

At 17mm, you can easily get a 1/10 sec blur free shot and I have seen 1/5 sec clear shots as well.

Regarding using the OS and in camera systems together, no this can't be done because they work against each other, not in synergy, from what I have read from other users.

Consequent to the above, I don't see an advantage to OS in a pentax mount lens at short focal lengths. Seems like an unnecessary expense to me.
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