A little more info would help. What type of photography are you into? Sports, nature, wildlife, weddings, portraits, indoor, outdoor, studio??? The more info you can give us, the better.
"I thought that because fewer wolves meant more deer, that no wolves would mean hunters' paradise. But after seeing the green fire die, I sensed that neither the wolf nor the mountain agreed with such a view."
Aldo Leopold
My general walk around lens is a Tamron 17-50 f/2.8. I use a 30D which is pretty much the same as a 20D. Any Canon DSLR below the 5D has a 1.6 crop. All of a sudden, focal lengths that start in the teens have become very popular and are not just ultra wide angle lenses.
Really to make a decision on a lens to use as a "walk around" lens you would definately need to give us more information as to what genre of photography you intend or enjoy doing. I personally have my Sigma 50-500 Bigma on my camera(s) most of all lenses as I shoot trains mainly.
As per the statement I quoted... there are four crop factors that you need to be aware of. The first being Nikons 1.5x crop. Canon uses three, full frame (5D), 1.3x crop (1-Series), and 1.6x crop (10, 20, 30, 60 series as well as Rebel series). The crop factor does NOT magnify a lens. It actually crops the outer edges from the image which gives the *effect* of a longer lens. But the lens does not change in focal length. A 50mm lens is STILL a 50mm lens.
Ross Mealey of TRJ Photography Berkshire Scenic Railway Museum Staff Photographer
National Press Photographers Assn. Member (NPPA)
Canon, Sigma, Mamiya, Toyo,and Rodenstock-Sironar My Railroad Photography
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Originally Posted by manacsa
