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Sigma 105mm f/2.8 EX DG Medium Telephoto Macro Lens for Canon SLR Cameras | 
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| Brand: Sigma
Category: Photography
List Price: $439.00
Buy New: $394.99
You Save: $44.01 (10%)
New (7) Used (1) from $394.99
Avg. Customer Rating:  10 reviews
Media: Electronics
Fragile: No
Batteries Included: No
Maximum Focal Length: 105
Minimum Focal Length: 105
Shipping Weight (lbs): 1
Dimensions (in): 4 x 4 x 3.1
MPN: B0002P19XA
Model: B0002P19XA
UPC: 085126257279
EAN: 0085126257279
ASIN: B0002P19XA
Availability: Usually ships in 1-2 business days
Shipping: Expedited shipping available
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| Features:
| • | Super Multi Coating reduces flare and ghosting that tends to occur when using digital SLR cameras | | • | High performance medium telephoto macro lens optimized for digital cameras | | • | Lens Construction - 11 Elements in 10 Groups | | • | 12.3 (31.3cm) Minimum Focusing Distance | | • | Dimensions - Diameter 2.9 x Length 3.8 (74x97.5mm) |
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| Editorial Reviews:
Product Description
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.Its 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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| Customer Reviews: Read 5 more reviews...
 Picture quality are good but make sure to have warranty July 24, 2008
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.
 Fun February 15, 2008
2 out of 2 found this review helpful
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.
Good picture quality, but very slow focus February 8, 2008
1 out of 1 found this review helpful
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)
 Excellent December 3, 2007
3 out of 3 found this review helpful
I just love working with this macro lens and my Canon digital SLR XTi. Perfect for my dental, intraoral photography needs.
Excellent macro lens for dentistry November 25, 2007
4 out of 4 found this review helpful
I have employed my Rebel XT digital SLR into my dental office. I upgraded to the Rebel XTi (10 mpixels) for home. I purchased the Sigma ring flash with a Sigma macro lens for the Canon SLR family. If you look at the Lester Dine website this is basically what they sell for a few hundreds dollars more.
I compared the ring flash and lens with the ones offered by Canon and felt that it was worth saving $300 by purchasing the Sigma combo.
The macro lens/ring flash work well for dental purposes. After a little experimentation I discovered that I get the best images by using the aperature priority setting. All settings are used with ISO 400 speed. I set the aperature at 14-16 for intraoral shots. This gives the best depth of field. I also use the operatory light for intraoral shots. I set the aperature to 6 for full face shots.
I use autofocus but set the ratio to 1:2 to 1:3 for intraoral shots. This keeps the autofocus from "hunting". I frame the shot by moving towards the subject. Once I get close to the image that I like I use the autofocus to get the final focus for the picture.
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