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11-20-2008, 12:30 PM   #1
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SDM focus question

I just received my DA 17-70mm SDM lens.
Although focussing itself is very silent the lens often seems to hunt a lot and during the hunting it makes a "ticking, cllicking" noise, like there might be some mechanical "play" in the focussing mechanism.

Questions:
- anybody wth a SDM lens has the same experience with the sound during hunting? DA 17-70mm in particular
- Is it normal for a DA 17-70mm to hunt relatively often (more than the kit lens)?

Thanks

Kees

11-20-2008, 02:09 PM   #2
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I've played with both DA* and have the 50/135 and i can't say i've heard any kinda of noise...

I will go to B&H tomorrow, and i if I have the chance, i'll test the 17-70, because it could be the SDM on the DA is slightly different from the SDM on DA*

Regarding the hunting, u gotta remember this is a f/4 lens. Hecka, even the DA* hunts on low light situations...
11-20-2008, 03:01 PM   #3
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Original Poster
QuoteOriginally posted by BBear Quote

Regarding the hunting, u gotta remember this is a f/4 lens. Hecka, even the DA* hunts on low light situations...
Thanks in advance BBear.
Point is that the lens also hunts in daylight conditions and even worse than the kit lens. Also focus loch especially at 70mm is a problem sometimes.
11-21-2008, 01:29 AM   #4
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Hi Kees, I have found some hunting in contrasty situations even in natural light, or for macro at 70mm, I am not sure if there is a pattern. I think it happens towards the longer focal lengths but I have not done systematic tests. Perhaps it is due to the softness of the lens at f4. But no clicks or ticks, just plain sdm "short" hunting ("brr-brr-brr").
Grégoire
ps I would like to know if you have the same pattern for center sharpness as me (see my post in https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/41158-pentax-17-70-f4.html). If you have a chance to do some tests...

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