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01-26-2011, 03:16 PM   #1
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Which Pentax zooms are reliable?

I recently bought a 17-70 DA and there were a couple of faults with it: out of focus at F4, and the focus sometimes failed to move at all if I had previously manually set it at the shortest distance.

I read lots of stories here and elsewhere about the SDM focus motor being unreliable.

Currently I use a 16-45 DA which I've had for 4 years and I think I am sticking with it...

Is there a lens as reliable as the 16-45 but with more range, but no worse quality?

The camera is a K5.

01-26-2011, 04:06 PM   #2
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The 18-135 has a different focusing motor. You could keep the 16-45 which is pretty good, and get a 55-300 to complement it.
01-26-2011, 05:10 PM   #3
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how about getting a Tamron 28-75/2.8 ?
01-26-2011, 05:40 PM   #4
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QuoteOriginally posted by peterh337 Quote
Is there a lens as reliable as the 16-45 but with more range, but no worse quality?
A very broad question...

The DA18-250 mm has more range and it is highy reliable, sturdy and solid. It is all depends upon what you want and what you intend to use for.

If you shoot outdoor, the DA18-250mm is your best all-around lens option. (The Tamron 18-250mm is an as good option since the 2 lenses are both manufactured by Tamron....) Like any zoom lenses, it has some shortcomings since the lens is a compromise across the focal range. But the DA18-250mm is used by many Pentaxians incl. professionals.

01-26-2011, 06:06 PM   #5
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I agree with hcc.
01-27-2011, 07:07 AM   #6
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How reliable is the 18-135?

I carry just one lens.

Also I haven't found any reviews of the 18-135 showing distortion data. The 16-45 is about 2.5% on average and is OK. Historically zooms tended to be terrible but they are better now, I think.

Could anybody offer a view on the image quality comparison between the 18-135, and the 16-45, when used at say 25mm?
01-28-2011, 01:01 PM   #7
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QuoteOriginally posted by peterh337 Quote
How reliable is the 18-135?
It has only been out for a few months - too early to have any meaningful data.
01-28-2011, 01:18 PM   #8
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i don't think anything is absolutely 100% reliable. For me, the 55-300 was the only zoom i've had that constantly give me predictably good results.

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