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04-24-2011, 05:18 PM   #1
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Join Date: Oct 2006
Location: 2 hours north of toronto ontario canada
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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.
has anyone compared?
great lens except a bit slow at the max zoom and a little soft at fully open


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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