I will give a second positive opinion on the Sigma DC 18-125mm.
Sharpness is very good until you reach the longer end.  Distortion on
the wide end can be an issue but for most subjects it is OK.  I have
not had any issues with flare.  This lens lives on the *istD that my
wife now shoots.

Some examples she shot:

http://picasaweb.google.com/mpell555/SouthCarolinaBotanicalGarden#5203025833012929650
http://picasaweb.google.com/mpell555/SouthCarolinaBotanicalGarden#5203026017696523394

Flare Control:
http://picasaweb.google.com/mpell555/AsilomarStateBeach#5178155708314529378

Typical distortions:
http://picasaweb.google.com/mpell555/CharlestonMarch2007#5043825553141407810

On Tue, Apr 14, 2009 at 4:22 AM, Brian Walters <[email protected]> wrote:
> Jim, Larry, Joseph, Igor
>
> Thanks for the feedback on this.  It seems the Pentax/Tamron 18-250 is a
> viable option, provided I stay aware of the limitations.  Definitely
> being considered.
>
> Jim - thanks for the thoughts on the Sigma 18-135 mm.  That one would
> probably meet most of my needs for a walk about lens. The Sigma 17-70 is
> probably not long enough for what I think I need!
>
>
> Cheers
>
> Brian
>
> ++++++++++++++++++++++++++++++++++
> Brian Walters
> Western Sydney Australia
> http://members.westnet.com.au/brianwal/SL/
>
>
>
> On Sun, 12 Apr 2009 13:43 -0400, "Jim King" <[email protected]> wrote:
>> Brian Walters wrote on Sun, 12 Apr 2009 03:55:38 -0700
>> > G'day all
>> >
>> > I'm contemplating getting a wide to tele zoom as a "walk around lens",
>> > when I just want to carry a camera and a single lens.  I'd like
>> > something that starts at around 18 mm and goes to at least 135 mm.
>> >
>> > I'm aware of the Pentax, Tamron and Sigma 18-250 mm zooms but that
>> > range
>> > seems to be asking a lot of optical design.  Does anyone have
>> > experience
>> > with any of these? Are the Pentax and Tamrons pretty much the same
>> > thing
>> > under the skin?
>> >
>> > Are there any other affordable options?
>>
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