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Sigma 17-70mm f/2.8-4.5 DC IF Macro Lens for Pentax and Samsung Digital SLR Cameras | 
 enlarge | Brand: Sigma
Category: Photography
List Price: $369.99
Buy New: $339.00
You Save: $30.99 (8%)
New (5) Used (1) from $339.00
Rating:  8 reviews
Media: Electronics
Fragile: No
Batteries Included: No
Maximum Focal Length: 70
Minimum Focal Length: 17
Shipping Weight (lbs): 1
Dimensions (in): 3.2 x 3.2 x 2.1
MPN: B000EG46O6
Model: B000EG46O6
UPC: 085126669607
EAN: 0085126669607
ASIN: B000EG46O6
Release Date: January 31, 2006
Availability: Usually ships in 1-2 business days
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| Features:
| • | Large aperture standard zoom lens designed Specially For Digital SLR Cameras. Macro lens level close up ability | | • | Minimum focusing distance of 7.9.., maximum magnification of 1:2.3. | | • | The new multi layer lens coating and lens design reduce flare and ghosting l | | • | Aspherical and SLD lenses, offer excellent correction for various aberrations. | | • | The lens offers a large aperture of F2.8 at wide angle. |
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Product Description
Sigma Corporation is pleased to announce the launch of the new 17-70mm F2.8-4.5 DC MACRO lens. It can be used with wide variety of subjects and it is an ideal large aperture standard zoom lens for digital SLR cameras featuring APS-C size image sensor. This lens has a minimum focusing distance of 7.9.. (20cm) throughout the entire zoom range. Maximum magnification of 1:2.3 enables close-up photography like a macro lens. The new lens design and multi layer lens coating reduce flare and ghosting, which is a common problem with digital cameras. A Special Low Dispersion (SLD) lens and two aspherical lens elements provide excellent correction for all types of aberrations and produce a high level of optical performance throughout the entire zoom range. This lens offers a large aperture of F2.8 at 17mm wide angle and yet it is compact, with an overall length of 82.5mm (3.2..) and diameter 79mm (3.1..). It performs superbly even in relatively low light conditions indoors or at dusk. The lens design incorporates an inner focusing system, which ensures fast AF speed as well as prevents the front of the lens rotating, making it particularly suitable for use with circular polarizing filters and petal shaped lens hoods. This lens is also equipped with Zoom Lock Switch that eliminates ..Zoom Creep.. during transportation.
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| Customer Reviews: Read 3 more reviews...
 quality issues October 23, 2008
stanjo (USA)
I returned the first lens because it was back-focusing with my Pentax K100D. The second lens was ok, but strangely, softer than the first one in tests with a focusing chart (albeit no backfocusing).
Both lenses appear softer than the Pentax kit 18-55mm, which is disappointing.
I decided to keep the lens as it is the only 17-70mm that works with K100D body, is not absolutely terrible, and is not very expensive.
If you buy this lens, check for backfocusing problems. Search the web for numerous posts about this.
 Sigma 17~70 DC Zoom for Pentax April 20, 2008
Walter E. Hamler
1 out of 1 found this review helpful
I purchased this lens to replace the standard kit lens that came with the Pentax K10D. It has proven to be of exceptional quality both optically and mechanically. I have shot it under many varied situations and it continues to give me the exact results I hoped for.
I plan to purchase the Sigma 70~300 APO MAcro zoom soon to supplement the 17~70 and expect the combo to fit 99% of my lens needs.
Good quality Versatile Lens February 11, 2008
Eric Seavey (MA, USA)
1 out of 1 found this review helpful
I purchased this lens for my Pentax K10D, and it works quite well. The zoom range is just right for most applications and the semi macro performance is handy. Performance wise it is very sharp, low CA, low vignetting and low distortions. At 17mm the performance sags a little with some distortion and when wide open some vignetting. In most cases I haven't had a problem. At 17mm, however, the distortion gets pronounced at distances less than 3 feet (1 meter), so take a few steps back if possible. Aluminum construction is nice.
Overall highly recommended!
 Defective? January 27, 2008
Cynthia Farr-weinfeld (Portland, ME)
4 out of 7 found this review helpful
I used the 17-70 for a little over a week before coming to the conclusion that mine must be defective. Where other people rave about how it focuses on a dime even in low-light levels, mine could barely be persuaded to focus on the best of days in perfect light. Very few of my pictures taken with it were what you could call crisp and none "tack sharp." Plus, it's very heavy, which made it difficult for me to handhold w/o some motion blur which only added to my problems. My father owns this lens and swears by it and his pictures ARE tack sharp with no vignetting or chromatic aberrations, so that was ultimately what lead me to conclude it defective. I returned it to 47th Street Photo, who still have yet to give me my refund, despite having had the lens since the 11th of january, and even though there will be no re-stocking as they will be sending it back to the manufacturer, they are charging me an exorbitant $50 "re-stocking" fee as I decided I didn't want another one of these behemoth lenses in my camera bag.
Nice walk around lens, excellent color January 23, 2008
Sachin
2 out of 2 found this review helpful
I got this lens about a month ago and it has been on my Pentax K10D for most of the time. The lens produces sharp pictures with nice colour and contrast in daylight and covers a good range from wide angle to medium telephoto. The only issue is that f2.8 is only available till 21 mm. Not the best choice if you want to shoot in low light.
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