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11-11-2011, 01:06 PM   #1
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Tamron 18-200mm vs Pentax 18-35mm and other lens options

i am wondering if the tamron 18-200mm is a good lens most people on review complain about a lot of things on it but i want an all in one lens like the pentax 18-135 but that is to pricy. do they comaplin because they have da* lenses and are used to that qualitty i am just wondering if it will take better pics that the standered 18-55 and my tamron 70-300mm if it has better quality or equal then i will buy it but i am young and dont have a lot of money.

i have a k-r and what i am lookeing for is an all in one lens good quality and decent AF,
thx

11-11-2011, 01:40 PM   #2
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It will likely not be any better than what you are using now, and in fact may be worse in areas. The problem with super-zooms is they are full of compromises to be able to cover the huge range
the 18-55 you have is considered the best of it's type across brands by many people. the tamron 70-300 i am not overly familiar with
The KR is an excellent camera.
If you want to improve your performance for a walk around lens why not look at the DA17-70 f4.0 Pentax. it won't give the reach but it will outperform the tamron and both the lenses you already have
as an added benefit it is f 4 across the range which is faster than all the mentioned lenses except at their widest settings . Many people seem very happy with it as a lens.
11-11-2011, 01:44 PM   #3
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Er, a few things to think about.

The Tamron 18-200 isn't the best of the superzooms, it's bigger brother the 18-250 is supposed to have as good IQ (if not better) than the kit lens (18-55). The Pentax 18-135 is supposed to have better IQ than the kit lens.

So to summarize - get the Tamron 18-250 if you can. Getting the 18-200 or 28-200 isn't that worth it.
11-11-2011, 02:12 PM   #4
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I can't comment on other kit.lens replacements|enhancements, but I've had a couple 28-200's (Tamron and Tokina) and they just come nowhere near the quality of the DA18-250 or its Tamron twin. Every review you read will echo this.

Yes, the DA18-55 kit.lens (various incarnations) is much better-regarded than its counterparts from Canikony. Yes, the 18-250 is better (and faster!) in the 18-55 range than the kit.lens. No, the 18-250 isn't perfect, it has superzoom compromises and zoom creep (easily remedied) and isn't the smallest lens. As with the 18-55, some of its few shortcomings can be fixed in PP, or avoided by staying out of its extremes.

But sticking with one superzoom, rather than swapping lenses at inconvenient moments and missing shots, is a huge plus. The IQ of a missed shot is zero. When I travel or expect dynamic situations (i.e. I don't know *what* to expect) the 18-250 saves my butt. My most minimal zoom kit are the Tamron 10-24 for tight spaces and the DA18-250 for almost everything else. Throw in a cheap F35-70 for prime-like IQ in its range, and a FA50/1.4 for dimness and/or action and/or portraiture, and I'm pretty well covered.

11-11-2011, 03:01 PM   #5
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I had the 18-200, it was ok, but spend the money for the 18-250 if you want a superzoom. I prefer the Tamron 28-75/2.8 for a walk around lens personally, some may find it limiting and prefer the 17-70. I got a chance to play with an 18-135. It was whisper quiet, fast focusing and well built; but I didn't get a chance to check out the output.
11-11-2011, 05:24 PM   #6
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You already received some solid comments and advice.

Among the all-around zoom lenses, there are several generations:
- the Tamron 18-200 and Sigma 18-200 (non OS) are the oldest and their IQ is considered one step below the others.
- the Tamron 18-250mm/DA18-250mm - Manufactured by Tamron and now discontinued, the lens is highly regarded as one of the best compromise all-around zoom lenses across all brands.
- the Petnax 18-135mm WR and Sigma 18-250mm OS HSM are newer and can be purchased new - The 18-135mm has a smaller range but WR, with IQ on par with DA18-250mm - The Sigma 18-250mm OS HSM is slightly more expensive than the DA18-250mm, IQ is on par but you need to switch off the lens OS if the you use the camera SR.

The Tamron 18-250mm/DA18-250mm remains an excellent option if you need an all-around lens. It can be purchased 2nd hand through the PF marketplace, and at reputed 2nd hand shops like keh.com and adorama.com.

The DA* lenses are different and no comparable: they are high-grade lenses and more specialised with narrower focal length range.

Hope that the comment will assist....
11-11-2011, 05:33 PM   #7
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I had Sigma's 18-200 in my Sony days at the same time as the Tamron 18-250. I found my copies were nearly identical in IQ, and the 18-200 was smaller and showed no zoom creep, so I sold the 18-250. Kept at f/8 and with a little PP, it does nice work. I had a Pentax copy of the Sigma for a while with my k-x, and still liked it. My DA18-135 / K-7 combo was less impressive than the 18-200 / k-x, at least above 100mm - but I did not use the 18-200 and K-7 together to make that comparison.
11-11-2011, 10:51 PM   #8
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There is also a Sigma 18-125 that you can consider instead of the DA18-135WR. I don't have experience with either but here is a test by photozone.de of the former: Sigma AF 18-125mm f/3.5-5.6 DC (Pentax K) - Review / Lab Test Report

If you have the option to buy in a shop, you can test the 18-200 there. Take some photos inside and outside, preferably with high contrast, and check the images on a computer in the store. Happy with the results? Buy it.

If you don't have a shop in the neighbourhood, I would suggest that you just buy the 18-200 and try it. If you're not happy with the quality, you might have the option to return it and you can fall back to your current lenses. Alternatively you can sell the 18-200 on the market place here, locally in the newspaper or on ebay.

As an alternative, buy the body only (or with the DA-L35/2.4 if you really want some fun) and save up for the DA18-135WR. Use your current lenses for the time being.

Quality is always subjective; people who also have DA* lenses often have a more critical eye for imperfections and pick them up more easily. You (like me) might never notice mild forms of purple fringing unless you start pixel peeping while somebody else will pick up the slightest bit of it. I'm however quite allergic to barrel distortions and don't feel like going through PP to correct them; you might never notice them.

Good luck with the decision.

11-11-2011, 11:08 PM   #9
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I have updated the thread title here to something more specific- remember, the better the title, the easier your thread will be to find and the more replies you will get

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11-12-2011, 06:58 AM   #10
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I have a K-r with the 18-55 and 50-200 kit lenses, and owned the Tamron 18-200 for about an hour. In that time I found that the autofocus was slow, noisy, and hunted a lot. Photos were not as sharp as either kit lens and the colours seemed somehow "flatter". I packed it up and sent it back for a refund.

The reviews for the 18-250s suggest that they are much better, but they are also a lot more expensive - so for the time being I am sticking with the kit lenses.

Last edited by Redundant Banker; 11-12-2011 at 06:59 AM. Reason: Spelling mistake.
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