[deckroid]

Thanks for all the input!

While I don't usually subscribe to the "One Lens" club, I will probably only use the Sigma for the Scotland/Switzerland trip. Unless I find a super nice 55-300 in the Marketplace! The airline we are flying from Scotland to Switzerland has a "ONE BAG ONLY" policy. If you bring two bags, bad things happen I guess.

[Kozlok]

The 17-50 will be fine. Learn how to stitch to simulate wider shots. Just let the tele shots go without another thought. I like one lens traveling and just worry about what you can shoot and not what you can’t.

If you are itching to buy gear, the 16-85 is great in good light and it’s WR. It has been known to rain in Scotland. If you will be indoors somewhere interesting, I’d want a faster lens along. The DA40 is microscopic.

[aslyfox]

. . . .The DA40 is microscopic.

and the SMC Pentax-DA 40mm F2.8 XS , " the best lens in its class " is even smaller and lighter

SMC Pentax-DA 40mm F2.8 XS Reviews - DA XS Prime Lenses - Pentax Lens Reviews & Lens Database

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Pentax DA 35mm F2.4 vs 40mm XS vs 40mm Limited
Introduction
. . . In this review, we will compare three of these—the DA 35/2.4, DA 40/2.8 Limited, and DA 40/2.8 XS—to see which lens excels for what purpose, and which is the best overall value as a normal prime. Read on for our Pentax normal lens shootout!


Read more at: Pentax DA 35mm F2.4 vs 40mm XS vs 40mm Limited Review - Introduction | PentaxForums.com Reviews

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either lens is perfect if you are concerned over weight/size issues


Limited:

Weight 90g (3.2oz)
Dimensions 63mm x 15mm (2.5 in. x 0.6 in.)

XS:

Weight 51g (1.8oz)
Dimensions 63mm x 9.2mm (2.5 in. x 0.36 in.)


Read more at: Pentax DA 35mm F2.4 vs 40mm XS vs 40mm Limited Review - What's in the Box / Specifications | PentaxForums.com Reviews