No comments about Sigma 17-35mm F2.8 EX Aspherical HSM Lens for Minolta-AF Camera.

No comments about Sigma 28-300mm F3.5-6.3 Aspherical Hyperzoom IF Lens for Nikon-AF Camera.

3 comments about Sigma 17-35mm F2.8-4 EX Aspherical HSM Lens for Canon-AF Camera.

1. I purchased this lens for my Canon Elan IIe in June, 2000. I've run about 50 rolls of print film through the camera with this lens and have been very satisfied with this lens. Please note that if you get the Canon EOS mount, the HSM is "micro-HSM," which like Canon's "micro-USM" does not allow full time manual focus (you must toggle a switch on the lens barrel to go from autofocus to manual focus). Filter size is 82 mm, which is large and increases the price of filters. The up side is that I have had no vignetting with a Hoya HMC skylight filter (normal, not thin width) a very good performance with an ultra wide angle zoom. Minimum focus distance is 0.5 meters (about 19"), slightly longer han one would like. Flare seems well controlled with the included hood and ghosting is minimal when shooting into the sun at f/8-f/16. Lens has very usable depth of field scales for f/11 and f/16. Nice sharp and contrasty results with this lens make it a bargain when compared to some of its competition.



2. I had this lens for about a year. Its optical quality is good. Sharp image in both ends of the zoom range. The service of Sigma USA is the best. I got a problem with the HSM of the lens after one year, just weeks after the warranty expired, so I called their customer service to see what they can do. They offered to fix the problem and treat it the same as within warranty. So I mailed the lens to them. To my surprise, the lens is fixed and shipped back to me within one week, without charging me anything, even the shipping. This is truly outstanding customer service.



3. I was given this lens as a gift from my father after he'd used it for about 5 years. Between he and I, this lens has broken 4 times. Three times the aperture mechanism would begin to stick, causing error messages on my EOS 10D. Currently, the autofocus has stopped working all together, though the manual focus still works just fine. When it works, it's a nice lens. It is sharp, had good color and takes good pictures. In fact, I really enjoy it. Be prepared to spend a lot of money on filters, though. At 82mm, good filters don't come cheap. This is a good lens, but it is likely to give you headaches. Consider buying Canon's 16-35mm or 17-40mm first; it may be worth the extra money. In fact, Sigma has another version of this lens that has a 77mm filter size for less money. I'd certainly take that one over this one.

1 comments about Sigma 8mm f/4.0 EX Circular Fisheye Lens for Canon SLR Cameras.

1. Autofocus doesn't work well at all, but then who needs autofocus on a fisheye lens? Very good images from this, and the chromatic abberation and vignetting is easily fixed in Photoshop.

No comments about Sigma 24mm f/1.8 EX DG Aspherical Macro Large Aperture Wide Angle Lens for Sigma SLR Cameras.

4 comments about Sigma 24-135mm f/2.8-4.5 Aspherical IF Lens for Pentax SLR Cameras.

1. I was so excited when I unwrapped my Christmas present...but when I saw the result I was rather disappointed! ;o( I use it with my *ist DS and I put it on my wish list since I already had the Sigma DG 70-300 (which I LOVE). For some reason it is super slow, 80% of the time I have to put it on MF since it's so slow at focusing and sometimes it won't even let me shoot at all in AF (still haven't figured out quite why). A lot of pictures seem to be vignetted/even blurry at times. The DOF definitely is a marvelous thing, but it seems to cost me much more time and frustration with the shoots than anticipated. I'm wondering wether I should've went with another make?! I'll keep testing it and maybe I'll change my mind - I sure hope so! SInce it was a bargain for the price. (My husband ordered it through amazon with Cameta as well.)
   
   Edit (may 2008): sent in the lens to Sigma because the focusing problem was a communication error between the lens and my *ist DS. It's been working very nicely, great sharpness, clarity and terrific DoF. Still not as fast as I hoped though, and not as quiet. But overall I'd definitely recommend it.



2. I really like this lens. While the image quality is not as good as a prime it is good for a zoom. I know some people have reported problems with Pentax I have not had any problems with my DL. The lens is heavy compared to some of the newer zooms, but I don't find that to be a problem. The zoom range works well for many situations where a prime might be limiting.



3. product ordered on 11-10-06. It is now January 19, 2007. UPS claims they delivered it and left it on the front porch. I was home that day. They never delivered it and still having difficulty getting the product or my money back.



4. Bought for use on a K10D. I love to work in available light, and most Pentax zoom lenses are pretty s-l-o-w, long-end f-stops in the 5.6+ range. Yes, I know they are coming out with DA 16-50 and 50-135 / 2.8-s, but it's a safe bet they will cost a young fortune. So this is a good interim choice while I save up my pennies.
   
   On a DSLR this lens offers angle-of-view equivalent to 36-200mm on a 35mm film camera. This lens is heavy and solid feeling, works as advertised, and seems right at home on the K10D. Focuses smartly, the entire frame is sharp, with no apparent light falloff or chromic aberration in the corners (Note that digital cameras don't use the entire image circle provided by the lens - film cameras do). Holds focus pretty well across the zoom range, it will refocus ever so slightly if you go from max wide to max tele. The lens has an apeture ring, almost inaccessible while mounted, but it belongs on 'A' all the time anyway on the K10D. It also takes the same size filters (77mm) as my Pentax 12-24mm, so I got that going for me.
   
   My only complaint, and it's minor, is that, since the zoom ring covers a large zoom range in a short distance -- the ring turns about 1.6 inches while the lens gets 70% longer -- it can be pretty hard to turn, especially when the lens gets cold. This will probably get 'broken in' pretty soon, I hope.
   
   This is a good general-purpose lens, wider and faster than anything Pentax makes, and must have presented major challenges to the designers. It's perfectly adequate for my intended use (general urban carry). I would give it 4 stars, but the low (sub-$200) price tips it up to 5.

No comments about Sigma 24-70mm f/3.5-5.6 Aspherical HF Lens for Canon SLR Cameras.

No comments about Sigma 1.4X APO Tele Converter for Minolta-AF Camera.

2 comments about Sigma 1.4x APO Tele Converter for Nikon SLR Cameras.

1. I use this converter on my Sigma 70-200 f/2.8 HSM Nikon mount. I used it first last fall at the Petit Le Mans at Road Atlanta and was very impressed with the results. Aperture is reduced to f/4, which is still a bright finder, and autofocus operation is not negatively effected. All electronic functions such as HSM and D coupling still work. Very sharp from my experience.



2. Works wonderfully with my Sigma 70-200 f/2.8 HSM. Fast, very sharp. Seems to be very well made. A great addition to any fast Sigma lenses.

No comments about Sigma 24-70mm f/3.5-5.6 Aspherical HF Lens for Pentax SLR Cameras.