Summary: Decent lens. 1. This lens is not tack sharp...the Nikon is sharper. The average person won't notice, but if you are like me, that three pixel difference will chap your hide. That being said, if you do not have a high end client base, you are just beginning, or being razor sharp is not a requirement...this lens will do. 2. The bayonet lens hood does not lock into place well and will eventually start to twist off when gently bumped.
Summary: So I guess it's common to get this error message, but I do like the quality of images in low light without flash. I can work with it. After reading several solutions, the one that helped me is: the aperture ring needs to stay locked at 22 in order for the camera to work on the Nikon D80.
Experienced Photographer here. Don't look for fine clarity with this lens! (Used on Canon 6D, no slouch of a Camera!)
8 February 2014
Summary: I've had this lens for about a year now and have taken 1000's of photos with it averaging 500 to 700 photos per event. I have found that while its great for general group, landscape, architectural, etc. type photography, it FAILS miserably at getting the eye pupil and iris in a clarity expectable for this photographer. Side by side comparison of this lens and my $100 Canon 50mm lens is embarrassing to the Sigma.
Before you buy, read this. Great lens but too heavy for casual/enthusiast use
Coconut the Critic, Amazon
3 October 2013
Summary: I have a Nikon D80 and wanted to upgrade my lens selection. This lens is beautifully made and is of pro/semi-pro quality. It is a good value for the money compared to the Nikon 24-70. It takes wonderful, sharp photos, especially at F3.5 range. BUT it is heavy. Too heavy to want to carry around at DIsney World all day in the heat of summer or anywhere else for that matter. The weight is not specific only to this brand.
Excerpt: As a travel photographer, I wanted to find a lens that was durable, relatively inexpensive, could cover most situations and still deliver high quality pictures. 24-70 is a good compromise but there are not many options on the market. The Sigma 24-70 f2.8 will deliver the best results when used with non-full frame cameras.While the Nikon lens with the same specs is clearly the best when it comes to performance, it's hefty price tag is hard to justify for...
Summary: I have to say that I am on the fence about this lens. I would say for portrait work and work up to 6-10 feet it's great, what I am finding so far however is that at greater distances when making an object the center of my focus I am really noticing softness in the lens at f2.8 and I really have to drop the aperture to 4.5,5.6 or less to really see the sharpness I am expecting.
Excerpt: I bought this lens to go with my D700 and am reasonably happy with it overall. However, on a Christmas trip to the Santa Fe, NM, area I found that I frequently had to dismount/remount it to the camera, as it would occasionally stop metering or focusing when temperatures were in the 20s and 30s F. I also own a D300 with the Nikon 17-55 and have never had that problem in that kind of weather.
Pros: Constant aperture, Fast / accurate auto-focus, Sharp
Summary: I had read more positive than negative reviews about this lens, so I ordered it to do wedding photography. The lens quality is very good except when it comes to the lens hood; it's very thin and bends easily. Overall, the lens barrel is sturdy and compact. In terms of focusing, the lens focuses fast & right on target. Some people say this lens is soft at F/2.8, but that's exactly the effect you want to create with your aperture wide open.