Canon EF-S 18-135mm F3.5-5.6 IS STM or Sigma 18-250mm f3.5-6.3 DC MACRO OS HSM

Started Nov 23, 2013 | Discussions thread
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The shootist
The shootist Regular Member • Posts: 221
Canon EF-S 18-135mm F3.5-5.6 IS STM or Sigma 18-250mm f3.5-6.3 DC MACRO OS HSM

I will be purchasing the Canon 70d soon and was wondering your opinions as to what would be the better of these two lens:
Canon EF-S 18-135mm F3.5-5.6 IS STM or the Sigma EF 18-250mm f3.5-6.3 DC MACRO OS HSM.
A little background, I own the Sigma Big Mama 50-500mm, and the Canon 100mm macro lens, most of my shooting is macro or wildlife-birds.
I know the Sigma 18-250 is a pretty good overlap to the Big Mama but its also over 3lbs lighter and much smaller, so would seem to make a good general walkabout lens from macro to telephoto.
Also note I don't do much with video so the 18-135 STM isn't a plus for me, I guess what I'm actually trying to find out is still picture quality between the two.
Cost wise if I buy the 18-135mm with the camera $400.00 and the 18-250mm is on sale for $349.00. Also I'm not apposed to spending more for a better lens.
I don't like changing lens, so if I'm out for the day I'm taking macro's or wildlife not both, and a general lens that's more manageable that dose some of both is what I'm looking for when I'm not specifically doing either.
Currently I have a Canon T3i, and a couple of other Canon lens that I won't be keeping.
Also a note to anyone wondering about the Big Mama's weight and size, I'm 70 yrs old and in just ok shape and I can carry this lens and camera around for hours.
The combined two weight over 6lbs. and measure with hoods on over 2ft long, I do use a Cotton Carrier Camera Vest that supports everything just fine.

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The Shootist (RETIRED)
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Canon EOS 600D Canon EOS 70D Canon EOS 80D Canon EF 50mm f/1.8 II Canon EF 100mm f/2.8 Macro USM +18 more
Canon EOS 600D (EOS Rebel T3i / EOS Kiss X5) Canon EOS 70D
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