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07-26-2011, 11:06 AM   #1
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K-r and Tamron 18-200mm

How well do the Pentax K-r and the Tamron 18-200mm lens work together?
Does the Tamron lens have it's own focus motor?

07-26-2011, 01:21 PM   #2
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Among the all around 18-200/250mm lenses, the Tamron 18-200 is an older generation lens together the Sigma 18-200mm (non HSM). The Tamron 18-250mm (rebranded DA18-250mm) was a major improvement in terms of IQ. The latest development is the Sigma 18-250mm OS HSM.

The DA18-250mm/Tammy 18-250mm is no longer manufactured but is readily available 2nd hand in the PF Market place, at Keh and Adorama (Used) about US$350-450. It is a better option IMHO.

Hope that the comment will help.
07-26-2011, 01:28 PM   #3
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Any Pentax mount Autofocus lenses that do not use Hypersonic Focusing (as far as I know, only higher end Sigma and Pentax lenses use Hypersonic Focusing) use a screwdriver-style connection in the camera body to perform autofocus. In general, those lenses that have a shorter focus throw (that is the amount of degrees to turn to focus the lens from infinity to minimum focus distance) will focus faster than a longer focus throw.

Now, I have an older version of your camera and prospective lens (Pentax K-x with Tamron 28-200), and I find that it focuses quickly on objects with good contrast and good light, but if I am using AF-S and it is already close to in focus, the lens occasionally scans the entire focus throw and I have to refocus again. Otherwise, in good light, stopped down a bit, my Tamron 28-200 takes rather decent photos in the 28mm to 135mm range handheld.

Hope that helps.
07-26-2011, 04:56 PM   #4
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I actually have (had while the camera is out to service) this combo right now. The lens works great but it's loud as heck!
Thankfully I mainly use it outside where the wind whisks away a lot of the noise, but indoors it scares the crud out of my cats.

No problems with focusing on it, but I usually use manual focus.

07-28-2011, 01:38 PM   #5
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Thank you all for your help
07-28-2011, 06:10 PM   #6
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I bought my first Tamron lens yesterday. It died yesterday evening, after about 20 shots fired. The diaphragm locked up, couldn't even get it to open by manipulating the bar, and it was stuck at f32 although the camera thought it was set correctly. I was shooting part of a tree, and after a shot the viewfinder just went dark. Bam.

All I can say, very cheap build. Think twice, and compare to other brands like Sigma. Even if Tamron tends to be cheaper, there's not much point if it doesn't last.
07-29-2011, 07:37 AM   #7
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No go for me.

I returned two Tamron 18-200mm lenses for the same issues. Both seemed very soft throughout the entire focal range. Both also had unacceptable chromatic aberration. I now have the Pentax 55-300mm DAL and find it to be far superior in image quality to the Tamron. I thought, with the Tamron, I could eliminate the need for the 18-55mm lens that came with the camera witch is not the case with the Pentax 55-300mm lens.
07-29-2011, 09:20 AM   #8
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The one I returned had wicked CA in some of the shots I took with it, too. Others were fairly clean. It was fairly sharp, but yeah, not amazing. It was a this 70-300 lens.

I'm honestly wondering if the guy sold me a return as new. In any case, he was very nice about taking it back, offering me refund or credit, and he knocked a few bucks off the one I exchanged it for, a Sigma 70-300. Despite some poor reviews, it seems pretty good for me, so far, but I've only done a bit of initial testing. Perhaps (and I hope) I got a good copy of it.

07-29-2011, 06:43 PM   #9
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i bought the sigma 18-200 and its good for me. picture quality is good
07-29-2011, 08:43 PM - 1 Like   #10
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I have had a Tamron 18-200 for a few years now on a K-x/ K200D. It's an OK general purpose lens - it isn't the sharpest lens in the world but it has good colour and contrast and a handy focal length range. To get the best optical performance out of it don't always shoot it wide-open - stop it down a notch and it's OK. Plus never put a UV filter on it, and always shoot using the hood.
07-29-2011, 08:45 PM   #11
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QuoteOriginally posted by Philoslothical Quote
The one I returned had wicked CA in some of the shots I took with it, too. Others were fairly clean. It was fairly sharp, but yeah, not amazing. It was a this 70-300 lens.
Yeah, I have that lens too. It is rather notorious for CA.
07-29-2011, 08:55 PM   #12
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QuoteOriginally posted by rawr Quote
Plus never put a UV filter on it, and always shoot using the hood.
+1, the lens hood makes a huge difference in color and contrast.
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