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11-01-2010, 01:39 PM   #1
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18-200+mm lens recommendations

I'm looking to upgrade my starter lenses with a single zoom lens. I've seen several and I was wondering if there is a particular one that stands out against the rest.

These are the lenses I'm currently considering:

Sigma 18-200mm f/3.5-6.3 DC Aspherical (IF) Lens
Sigma 18-250mm f/3.5-6.3 DC OS HSM Autofocus Zoom Lens
Pentax SMC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR Lens
Tamron Zoom 18-200mm f/3.5-6.3 XR Di-II LD Aspherical (IF) Macro Lens

I'd be replacing a Tamron 28-105mm AF f/4-5.6, a Tamron 80-210mm AF f/4.5-5.6, and a Sigma 70-150 f/3.5 MF. I generally use the 28-105 the most as it covers a good range, but I find myself wishing it was wider and had longer reach. I have around $500.

Thanks

11-01-2010, 01:42 PM   #2
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I have the Sigma 18-250mm f/3.5-6.3 DC OS HSM. The IQ is better than I ever expected for a super tele and seeing a stabilized image in the viewfinder is a real plus.
11-01-2010, 01:53 PM   #3
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I think the pentax 18-135 would probably be the best performer.

I am always somewhat skeptical about 10:1 zooms and Image quality over the entire range.

A more conservative zoom range should be a better bet.

Aside from that observation, I think you would then be well placed to add an ultra wide at the short end, and have everything basically covered.

Longer lengths would be specific to sports/wild life and you have different optipns when the middle lens covers up to 135mm
11-02-2010, 03:57 PM   #4
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I've used the Tamron and it is good...for his price.
The better one is probably the Pentax 18-135 as Lowell Goudge said (and it's WR too).

11-02-2010, 04:44 PM   #5
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Back in my A200 days I owned Tamron's 18-250 and Sigma's 18-200 (quantaray label, via Ritz Camera closeout). Both did quite well on 10mpx sensor; I preferred the compactness of 18-200 and sold the Tamron. As Lowell noted though, the chance of excellence at all focal lengths is elusive; both my lenses fared poorly around 100mm in my crude tests. When I went to K-7 I decided not to press my luck with the extra 4 megapixels, having heard many times that denser sensors demand good glass. Now I dare not try one to learn I'm wrong!

I'm quite pleased with 16-45 and 55-300 combo, but am watching with interest for the 18-135. With its weather resistance and Pentax pedigree I'm thinking it would be worthwhile.
11-02-2010, 06:43 PM   #6
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You already received some good advice. Let me add a bit of 'spice'.

First I would expand your list:
Sigma 18-200mm f/3.5-6.3 DC Aspherical (IF) Lens
Sigma 18-250mm f/3.5-6.3 DC OS HSM Autofocus Zoom Lens
Pentax SMC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR Lens
Tamron Zoom 18-200mm f/3.5-6.3 XR Di-II LD Aspherical (IF) Macro Lens
Pentax-DA 18-250mm F3.5-6.3 ED AL [IF]
Tamron AF 18-250mm F/3.5-6.3 Di II LD

The DA18-250mm and Tamron 18-250mm were both manufactured by Tamron. The lenses are highly regarded as among the best all-around zoom lenses. Although the production stopped, they can be found 2nd hand: marketplace, specialised 2nd hand shop like Keh, ...

Second, your choice must be linked with your needs. If you need a WR lens, the newer 18-135mm WR is the one to choose.

The Sigma 18-250mm OS HSM received some good users' comments in a number of threads of this forum. It is slightly dear, and the OS is redundant with your camera IS.

The Pentax/Tamron 18-250mm is regarded as a better lens than the older Tamron 18-200 and Sigma 18-200 lenses. If you can get a Tamron/Pentax 18-250 on the market place at a reasonable price, I would recommend it very strongly.

Hope that the comment may assist....
11-03-2010, 05:18 AM   #7
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The only part of the above I would argue is the part about the Sigma IS being redundant. The stabilized image in the viewfinder I find aids composition at longer FLs, and I read, but not tested, that it also aids auto-focus.
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