Sigma 17-70mm f/2.8-4.5 DC IF Macro Lens for Sigma Digital SLR
I use this on my SD14 for infrared photography. I use a Canon 50d for standard photography. The lens has a great range and is sharp and relatively fast. I really think this lens is the quality of the EX series. And it if it were 2.8 at 70mm it would probably be designated as one. Excellent build, Very sharp, Fast autofocus for not being HSM. Very much like the 18-50mm 2.8 ex lens.
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