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05-26-2011, 01:39 PM   #1
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Tamron AF 18-200mm F/3.5-6.3 XR Di II or Sigma AF 18-200mm f/3.5-6.3 DC

Hello Pentax World,

I am looking for all purpose 18-200mm lens and came up with this two model
  • Sigma AF 18-200mm f/3.5-6.3 DC
  • Tamron AF 18-200mm F/3.5-6.3 XR Di II

I am currently using my Kit lens DAL 18-55mm and DAL 50-200mm
Are this lens any good then kit lenses?

Also, which one should be better to go with?

All suggestions are most welcome

05-26-2011, 02:29 PM   #2
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Both 18-200mm lenses are older lenses. You should consider very serioulsy the Tamron 18-250mm/Pentax DA18-250mm lens which is a major improvement in terms of IQ. You will find independent reviews of these lenses at Camera lens tests, user reviews, camera accessory reviews - SLRgear.com! and Welcome to Photozone!.

The DA18-250mm was manufactured by Tamron. Identical to the Tamron 18-250mm, it was rebadged by Pentax. The lens is no longer manufactured, but you cna find some excellent copies at Adorama (Used equipment), Buy & Sell New & Used Cameras ? Canon, Nikon, Hasselblad, Leica & More - KEH.com and the PF marketplace, typically between $350 to $450.

I hope that the comment will help.
05-26-2011, 03:10 PM   #3
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QuoteOriginally posted by hcc Quote
you cna find some excellent copies at Adorama (Used equipment), Buy & Sell New & Used Cameras ? Canon, Nikon, Hasselblad, Leica & More - KEH.com and the PF marketplace, typically between $350 to $450.
Seems like it will be tough nut to crack to get DA 18-250mm
Well my other question was are this lens (Sigma and Tamrom 18-200mm) any good compared to DAL Kit lenses.

Also, what about this lens
  • Sigma 18-250mm F3.5-6.3 DC OS HSM
05-26-2011, 03:43 PM   #4
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The Tamron 18-200 isn't too bad. It's a useful walkaround and family snap-shooting lens and many people on these forums have gotten good results out of it.

As a low end superzoom it will always struggle against higher end zooms and primes, of course, but it does a respectable job. Resolution is OK if stopped down a tad, and colour rendering and contrast are very good. Just don't stick a UV or other filter on it since most of those will have a bad impact on the image quality of a lens like this.

The Tamron 18-200 compares well to the Pentax kit lenses. But the DAL 55-300 and DAL 18-55 are noticeably better than the Tamron 18-200 in the focal lengths where they overlap.

If the price is right, go for it. Lightroom 3 also has a correction module for the 18-200 too, which can be useful.

05-26-2011, 03:47 PM   #5
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QuoteOriginally posted by rawr Quote
The Tamron 18-200 compares well to the Pentax kit lenses. But the DAL 55-300 and DAL 18-55 are noticeably better than the Tamron 18-200 in the focal lengths where they overlap.
So the question is now, Is it worth trading DAL 18-55mm and DAL 50-200mm(not 50-300mm* ) for Tamron 18-200?

*(DAL 50-300mm is rated better than DAL 50-200)
05-26-2011, 04:53 PM   #6
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QuoteOriginally posted by Swapnil Quote
Is it worth trading DAL 18-55mm and DAL 50-200mm(not 50-300mm* ) for Tamron 18-200?
Not really. While the 18-200 is very versatile and handy in situations where you only want to use one lens for an extended period, the kit lenses are light, good quality and very useful, especially the 18-55 and 55-300 (don't know about the 50-200 since I don't have it).

The handy in-camera JPG lens corrections also don't apply to third-party lenses like the 18-200. Ditto for some exposure metering options (eg full matrix metering). Those features can sometimes make a difference, and provide a valid reason to stick with your Pentax kits.
05-26-2011, 04:57 PM   #7
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First thing you should always do when wondering about lenses is to check out the many reviews on this site - see the "Lenses" link above.

Then, if you still have questions, you should ask them in the lens forum, not one of the camera forums. I've moved this thread there.

Last edited by Marc Sabatella; 05-26-2011 at 05:40 PM.
05-26-2011, 05:06 PM   #8
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QuoteOriginally posted by Marc Sabatella Quote
First thing you should always do when wondering about lenses is to check out the many reviews on this - see the "Lenses" link above.
For both the lenses there are 4 and 5 reviews..that too 3-4 liner.
And I did read all of them. Since I wasnt satisfied with those reiew, I started a new thread.

Sorry that I couldnt hold my horses and posted in Camera Forum!

05-27-2011, 12:39 PM   #9
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QuoteOriginally posted by hcc Quote
You should consider very serioulsy the Tamron 18-250mm/Pentax DA18-250mm lens which is a major improvement in terms of IQ.
I can not find the Tamron 18-250 for Pentax, but I can find a Sigma 18-250. Is the Sigma 18-250 the better option?
05-27-2011, 12:47 PM   #10
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On Amazon, there is a $60 rebate on the Tamron AF 18-200mm lens if you order by the end of July,
05-27-2011, 01:32 PM   #11
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QuoteOriginally posted by dmfw Quote
I can not find the Tamron 18-250 for Pentax, but I can find a Sigma 18-250. Is the Sigma 18-250 the better option?
I found one on ebay for ~400$, went through forums and found DA 18-250mm is same as Tamron 18-250mm (as mentioned by hcc in earlier post)

My Question is, Is it worth trading for DAL Kit lenses?
05-27-2011, 03:24 PM   #12
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QuoteOriginally posted by Swapnil Quote
My Question is, Is it worth trading for DAL Kit lenses?
You must be be new here
There's no rule that says you have to trade away your older lenses when you get new ones.

You can keep what you've got AND buy more lenses. Welcome to LBA.
05-27-2011, 03:38 PM   #13
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QuoteOriginally posted by rawr Quote
You must be be new here
Yeah, I am new but there is no rule that either says keep your Kit lenses

If I get can better all purpose 18-200 lens. What will I do with 18-55 and 50-200 lens. Its better to give it a new home where he has got some use

Last edited by Swapnil; 05-27-2011 at 04:27 PM.
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