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.
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