Sigma 17-70. Excellent optics, very close focusing, fast (f2.8-4.5)
for a variable-aperture zoom. Yeah, it's a Sigma and not even an EX,
but I was VERY pleased with mine when I was using it on the K10D.

-Adam

On Sat, Nov 15, 2008 at 1:42 PM, Boris Liberman <[EMAIL PROTECTED]> wrote:
> Hi!
>
> So here is the list of some lenses that I thought about recently and the
>  considerations that may prevent me from buying them.
>
> 1. SMCP DA* 16-50/2.8 - serious distortions at wide end, quality control
> issues still there
> 2. SMCP DA 17-70/4 SDM - some say it is a sibling of SMCP DA 10-17 fish eye
> wide end distortion-wise. Perfect otherwise.
> 3. SMCP DA 16-45/4 - slightly less distortions at wide end, basically ok,
> though the CAs could be a problem.
> 4. Tamron 17-50/2.8 - suffers from curvature of field, rather good otherwise
> 5. Sigma 18-50/2.8 - well, I just don't quite like Sigma, and certain people
> call Sigma really nasty names
> 6. SMCP DA 21/3.2 AL Limited - excellent lens, just not wide enough
> 7. Tamron 17-35/2.8-4 - covers full frame, but also suffers from curvature
> of field
> 8. Sigma 17-70/2.8-4.5 - well, another Sigma
> 9. SMCP FA 20-35/4 - said to be excellent, but expensive and starting to
> become quite rare these days.
>
> No matter how strange this sounds, but it seems that there is no decidedly
> good lens in 16(17,18)-45(50, 70) range for modern Pentax DSLR. Each lens
> has some serious drawbacks.
>
> So here you have it - a short summary. Please don't kill the scribe.
>
> Boris
>
> P.S. I already have 21 ltd, it is listed here just for sake of completeness.
>
> P.P.S. I should watch for reviews of DA 17-70/4 and some sample shots as
> well.
>
> P.P.P.S. The price on (even brand new) DA 16-45/4 has gone down considerably
> now...
>
> 4P.1S. I have placed an order for Tamron 17-50/2.8 and I may still buy one
> for lack of better alternative due to its speed and sharpness. Having
> excellent sample of Tamron 28-75/2.8 has its impact on my reasoning...
>
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-- 
M. Adam Maas
http://www.mawz.ca
Explorations of the City Around Us.

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