I would like to replace a Sigma lens with a cannon equivalent.

Question

The lens is a Sigma 70-300mm 1:4-5.6 DG with macro.  Which Cannon lens would come close? The body is a EOS Rebal T3i.
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Answer 1

Hi, Cscott.
A few questions might help with the answer.
1.)  What other lenses do you own? 
2.)  What is your budget?
Also, weak color is not normally something you fix by going from one broad zoom lens to another broad zoom lens.  You might consider picking up an inexpensive prime lens, if you don't already have one.  They have less glass, thus less flare, thus deeper colors.  They also take in something like 4 times more light, meaning you can use 4 stops lower ISO, which will also preserve your colors and not let them get washed out by high-ISO distortion.
I would personally not try to cram so much use out of one lens.  The broader the focal length, the more compromises the designers had to make to get the lens to do that many different things.  If you do a lot of macro, maybe you get yourself an EF-S 60mm macro, or a 100mm non-IS macro.
If you shoot low light get maybe a cheap 50mm f/1.8 prime for $100 bucks.
Before I tossed that Sigma lens out, (and especially before replacing it with another lens that is nearly identical ! ), I would think about keeping it for what it is good at, like shooting outdoors in bright sunlight.  Then fill in the gaps with lenses that work better in low light (lower f/numbers/wider apertures) or macro.  If you can give up the zoom and go with a prime or two, you get much more image quality bang for less buck.
Scott
Canon 6D, Canon T3i, EF 70-200mm L f/2.8 IS mk2; EF 24-105 f/4 L; EF-S 17-55mm f/2.8 IS; EF 85mm f/1.8; Sigma 35mm f/1.4 "Art"; EF 1.4x extender mk. 3; 3x Phottix Mitros+ speedlites
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