0ur opinion:

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The Sigma 105mm f2.8 EX Macro delivers superb, distortion-free images throughout its broad focus range, from infinity telephoto to 1: 1 (life-size) macro, as close as 12.3' without accessories.lts non-rotating front lens group makes it easier to work with polarizing filters and has a focus limiter (eg. Full Range; - 15.8 in.; 14.6 in. - 12.3 in.).A 'focus-free' mechanical design allows the lens to auto focus without any interference from the manual focus ring. This makes it easier to hold the lens without affecting the speed or normal operation of the autofocus function. Rugged mechanical construction also makes it durable enough for even the heaviest use required by professional photographers.The Sigma 105mm f2.8 EX Macro features the new deluxe external EX finish. These features and other Sigma optical advances, including an uncommonly broad range of focus, make this an ideal lens for a wide variety of applications, from nature photography to portraits.A handy screw-in type metal sunshade makes it easier to rotate a polarizing filter.

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0ptimized for Canon digital SLR cameras but also compatible with film SLR cameras, the Sigma 105mm f/2.8 medium telephoto lens allows a greater working distance between the lens and the subject, helping it excel in all shooting ranges. The increased working distance of the lens is ideal when taking the picture of a flower among several branches, or an insect on a leaf. The narrow angle of view helps simplify the background, while the shallow depth of field makes it easier to handle the composition. The lens also offers a super multi coating that reduces the flare and ghosting that tends to occur when using digital SLR cameras, helping create crisper, sharper photos. And thanks to the Dual Focus (DF) system, the lens is easy to hold during autofocusing, but also offers smooth and positive action should you choose to focus manually on images. 0ther features include a minimum aperture of f/45, a screw-in lens hood that supports the use of circular polarizing filters, and a minimum focusing distance of 12.3 inches. 0ffering a 35mm equivalent field of view of 178mm on a digital SLR camera, the lens carries a one-year warranty.

Specifications

• Focal length: 105mm
• Maximum aperture: f/2.8
• Lens construction: 11 elements in 10 groups
• Angle of view: 23.3 degrees
• Number of diaphragm blades: 8
• Minimum aperture: f/45
• Minimum focusing distance: 12.3 inches
• Maximum magnification: 1:1
• Filter size: 58mm
• Corresponding AF mounts: Canon
• Dimensions: 2.9 inches in diameter and 3.8 inches long
• Weight: 16.1 ounces
• Warranty: 1 year

Some more accessories for this product for you:
     click 4 more

Some more accessories for this product for you:

• Tiffen 58mm 11 Filter (Green)
• Tiffen 58mm 47 Filter (Blue)
• Tiffen 58mm 80A Filter
• Tiffen 58mm 812 Warming Filter
• Tiffen 58mm 81A Filter

Piece Availability: Usually ships in 24 hours

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Buyer's feedback: - * Will satisfy your most basic needs for macrotography ...
Overall , the image quality is very good -- the sharpness is undeniably good. I'm no sucker for the techy terms but my most qualified review of the photos is -- I am very satisfied with the quality.

Downside - the AF motor is very slow. And MF is a bit mystery to me. I could not control the focusing during MF. Normally, I just move the switch to MF to lock on the subject and that's after focusing with the AF. I could not move the zoom range using MF (i must be doing something wrong ... or the instruction in the manual is not clear to me). The focusing motor moves back and forth most of the time before locking on to the subject -- that's what's making it slow -- so I always end up loosing the opportunity shot and have to wait for the subject to return for the shot.

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Buyer's feedback: - A++++
Shipped on time.
Great Product.
Excellent price.
Will buy from them again and again.

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Buyer's feedback: - * Picture quality are good but make sure to have warranty ...
I bought this lens in December 2007 and just start to use it from this March. The picture quality is good but needs a lot of light and contrast for the AF to work.
In June, during an outing, one of the element (glass) fell out of it's holding socket and the lens would not retract to below 1:3.
Since I bought this lens in gray market, so that there's no warranty. I just open the lens and fix it myself, works fine.
However, the story did not end there. Just yesterday, during some test shots at home, the lens would not focus and the motor is trying but could not move. I switch to Manual but the focusing ring would not stay at M mode and I can turn the ring freely and it won't adjust the focus (in AF mode, the ring supposed to have resistence from the motor gear and you should not try to adjust manually).
If you are thinking of buying this lens, make sure to buy it with warranty or better yet extended warranty.

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Buyer's feedback: - Fun
This is a very fun lens with great color and clarity. This stays on my camera 90% of the time and with f/2.8 it's still useful indoors. Although I think the lens I received may have been faulty the only problem is the auto focus. I've had this lens for only about 6 months and the AF is pretty much shot. It constantly searches no matter what light condition I'm in and it never comes out clear (when using AF). The auto focus also sticks halfway so I've got to give it the extra push, but to save the hassle it's just better to use manual focus from now on. Like I said, I think I've received a faulty lens, but I have read on quite a few Sigma reviews that their auto focus is not very dependable. I love this lens I just wish I could have the luxury of good auto focus like Canon's USM.

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Buyer's feedback: - * Good picture quality, but very slow focus ...
Pros:
Very good image quality
Very solid build
Very sharp when used with tripod
Good price

Cons:
Extremely slow autofocus, AI servo mode is useless
Extends front element during focusing
Slight CA detected in some images
Not very useful in handheld mode unless lighting is very good (full sunlight)