Sigma 18-200mm f/3.5-6.3 II DC OS HSM Q&As

Announced Oct 10, 2011 •
Lens | Canon EF-S, Nikon F (DX), Pentax KAF3, Sigma SA Bayonet, Sony/Minolta Alpha DT
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Hi, I'm looking at getting a walkabout lens for my Nikon D5100 for when I am vacation. So far I have narrowed it down to these two lenses. They are both pretty reasonable and have some decent reviews. I know the downside of getting a lens like this, but it is what I need to save carrying around several lenses when on vacation. And I don't really want to splash out on the Nikkor equivalents. So I was wondering if anyone has had any experience with either one of the lenses or both? As I'm...
I'd like to upload some of my pictures to sites like Flickr and Facebook but they'll only accept known picture files - NEF not included. Any advice on what programs i can use to convert NEF to JPG with minimal changes/loss to my RAW pictures? Mind you, JPG Fine isn't an option, i can see a noticeable difference there. Thank you.
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