I'm using a Panasonic 24-600mm zoom with f2.8 all the way through the zoom range so it lets heaps of light through for fantastic pics.
We have few Canon and Nikon SLRs and most of the traveling shots are with the Pano for ease of use and zoom characteristics.
Edit- this is the model http://m.dpreview.com/reviews/panasonic-lumix-dmc-fz200
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