Quote:
Originally Posted by LoveDSLR
Another advantage of a DSLR is that you can use a lens with the right focal length. In your case (for vacation), you can consider a 18-200 or Tamron 18-270 VC. If you need a UWA then consider a 10-22 or Sigma 10-20.
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Personally I choose quality over quantity. The larger the zoom range, the lower the image quality. This already shows when you compare Canon's 17-55mm with their 17-85mm lens. If you just keep your body's lens opening pointing downward when you change lenses, and you take care not to let the wind blow in there, you should be fine.
Of course dust will settle on your sensor, and you'll have to blow it off, but that's a simple operation of a few minutes. I wouldn't suffer lower quality photos just to prevent that. Which you can't, by the way. A zoom lens will also breathe air every time you zoom in or out, pulling dust into your camera. The shutter itself also releases (very) small quantities of dust. All in all the only thing you can do to completely prevent dust on your sensor is shoot film.