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11-14-2010, 04:04 PM   #1
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Join Date: Dec 2007
Posts: 12
Pentax 18-55 + 50-200 vs. Pentax 18-135 wr vs. Tamron 18-270

At the moment I've got the 18-55 and the 50-200 wr using them with a K7 (and some other more specialized lenses, eg the 40 ldt and 55*). I am thinking about a reduction of the numbers of my lenses and one option is selling the 18-55+50-200 and replacing it with the Tamron 18-250 or the new Pentax 18-135 wr.
I would keep at least the 40 ltd as a prime lense.

My question is: What are the reasons to take the new Pentax 18-135 instead of the Tamron 18-250? Both of them encompass a big range and both are not that fast/euqally slow. Both are zooms and their image quality will be similarily worse than the image quality of primes. So to say, I know the zooms are worse than primes. Knowing this I only would like to have one lense as a standard lense with a bigger range than 16-50/17-70mm and a image quality being not worse than the quality of the 18-55+50-200.

The single hard fact advantage of the Pentax is the wr, so weather resistance. The advantage of the Tamron is the bigger range (18-250mm).

Referring only to image quality: Are the lenses comparable to each other?
Or is the image quality of the 18-135 one (or more...) step ahead?
Is there a difference in image quality between the 18-55+50-200 on the one hand and the Tamron 18-250 or Pentax 18-135 on the other hand?

Would you replace the 18-55+50-200?

ps: Tamron 18-250, not 270...

Last edited by Italian; 11-14-2010 at 04:22 PM.
11-14-2010, 04:08 PM   #2

Join Date: Mar 2010
Location: SW Washington
Posts: 833
Tamron does not offer the 18-270 in Pentax mount.

There are very few shots available from the 18-135 so far (only a couple from Photokina), so there isn't much we can say about the quality just yet. But from what I've seen, it is decently sharp, even at the long end.

Last edited by Cannikin; 11-28-2010 at 04:34 AM.
11-28-2010, 03:33 AM   #3

Join Date: Nov 2008
Location: Bangalore
Photos: Gallery
Posts: 2,450
I would go with 18-250mm unless WR is needed.

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