Reviews and Problems with Sigma 17-70mm F2.8-4.5 DC MACRO
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Only zoom lens in my set up
2 February 2013
Summary: This is the only zoom lens that is worth taking anywhere, crisp sharp quality from both ultra wide to macro! Quick focal ring Great for video work! A bit on the heavy side but what good glass isn't!
Summary: Considerably sharper than its newer stabilized big brother, the 17-70 f2.8-4 OS. In my opinion the significant image quality difference is more important than the stabilization. Build quality is quite good.
Summary: Checked with my Nikon D5000. Got clear and VERY sharp pictures. Compared with 18-105VR and 18-200VR. Sigma provide much better pictures. Focusing quick even in low light. Quite motor. Built like tank. Good value for money. Update: 08/01/2011 Spent lot of time with lens. Found that color reproduction annoying due to warmer colors. Lower focusing distances means working with PS to fix noticeable distortion. Probably 17-30 is useless range for this lens.
Summary: Agree with other positive reviews. However this is not able to match the standards set by a Canon L series lens. There is a noticeable difference in clarity etc. However this is a good all round lens and better than some of Canons budget offerings (17-85 etc). The icing on the cake for me is the ability to get closer than any other similar lens. This is almost a true macro. For a serious amateur I would recommend this.
Summary: I bought this lens as a replacement for the kit lens that came with my Pentax K10d. I was unsure about buying a Sigma lens, but Pentax doesn't offer a 17-70mm zoom lens with 72mm objective. Well, it was a good decision. I was very pleased at how sharp this lens is, and its performance in low light. The in-lens stabilization is better than that in the K10 camera body, enabling me to hand-hold at as low as 1/10 sec shutter speed.
Summary: Unless you're flush with cash, a Pentax DA* lens is a bit beyond your financial reach. In a search for a faster alternative to hopefully replace a lens with affordable "glass", enter the Sigma 17-70mm f/2.8-4 short zoom. I bought mine from another vendor and took advantage of a fellow-Pentax owner's coupon codes which brought the price down to $389.00 - including shipping to Alaska. Aside from the good deal, I still had my doubts.
Summary: I bought this lens primarily for low light use since I like to shoot at night. So far so good. I have not critically tested the sharpness but casual observation indicate good resolution although not as good as the Nikon lenses. Mechanically it works great. I like the focus lock and its convenient location. This is good for shooting in low light. Lastly, it is a good value for the money.If you get a comparable lens expect to pay at least $100 more.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Strong Construction