EX DC OS HSM, what does these abbreviation means??

EX is Sigma's pro series lens (called EX finished), DC means it is for crop sensor cameras (DG for full frame), OS stands for Optical Stabilization (Image Stabilization) and HSM means it has hypersonic AF motor which is driven by untrasonic waves to provide a quiet operation.

Is it work with Canon 5D mark II?

It should work but it's not the best choice. The 5D is a full frame camera, and the Sigma is for APS-C sensors (smaller sensor). You will see vignetting (black area at edge of picture). You should consider the Sigma 24-60mm 2.8 instead, or check this list for other Sigma lenses for full frame cameras: http://www.amazon.com/Canon-Full-Frame-Lens-Substitutes-Sigma/lm/R1XMV8PZXQALTP

Does this lens work on the 70D? Looks like it'd be a great lens for video and stills.

Yes it does work and it is a great lens.You will be happy with the picture quality and sharpness.

Please tell me if this 1 more expensive lens could be used to obtain the similar quality images than 3 less expensive lenses that I am looking at -- 35mm prime f/2.4, 50mm prime f/1.8, the kit 18-55mm lens. I am on a budget and new to SLRs...thanks in advance.

I haven't used the 35mm but i can assure you the image quality is better than the 50 f1.8 or the kit lens. This sigma will serve you well as a starter lens and actually shouldn't be something you immediately feel like upgrading. Primes are well and good if you are ready for them but zooms are better for starting out. if you test out different focal lengths you can find out what prime lenses will work best for you. you don't want to buy a 35mm just to find out you'd rather have a 24, etc.

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17-50mm F2.8 DC OS HSM Large Aperture Standard Zoom Lens for Sony Digital DSLR Camera

Product ID: 5271583

Details

Brand
Sigma
Camera Lens Description
50mm
Compatible Mountings
Sony/Minolta
Focal Length Description
17-50
Lens Type
Standard

🌙Bright f/2.8 aperture for low light

🎯17-50mm versatile zoom range

🛡️4-stop optical stabilization

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Description

📸 Elevate your Sony shots with pro-grade clarity and speed!

WHISPER QUIET FOCUS - Hyper-Sonic Motor (HSM) ensures fast, silent autofocus—perfect for professional shoots and candid moments alike.
LOW LIGHT BRILLIANCE - Shoot confidently in dim environments thanks to the constant f/2.8 aperture that delivers stunning clarity and bokeh.
STEADY SHOTS ALWAYS - Advanced optical stabilization compensates for up to 4 stops of shake, keeping your images crisp and blur-free.
PRECISION ZOOM MASTERY - Seamlessly capture every moment from wide-angle to portrait with the flexible 17-50mm focal range.
OPTIMIZED FOR SONY A MOUNT - Tailored specifically for Sony APS-C sensor cameras, ensuring peak performance and compatibility.

The Sigma 17-50mm F2.8 DC OS HSM is a high-performance standard zoom lens designed for Sony A-Mount APS-C cameras. Featuring a constant bright f/2.8 aperture, 4-stop optical stabilization, and a fast, quiet Hyper-Sonic Motor autofocus, it delivers versatile, sharp, and steady images across a wide focal range. Ideal for professionals and enthusiasts seeking superior image quality and reliable performance in diverse shooting conditions.

Specifications

ASIN	B006G7WQOY
Best Sellers Rank	#94 in SLR Camera Lenses
Brand	Sigma
Camera Lens	50mm
Color	Black
Compatible Camera Models	[INSUFFICIENT_DATA]
Compatible Camera Mount	Sony/Minolta Alpha DT
Compatible Devices	Sony (D)
Customer Reviews	4.0 4.0 out of 5 stars (94)
Focal Length Description	17-50 millimeters
Focus Type	Auto Focus
Global Trade Identification Number	00085126928636
Image stabilization	4 stops claimed
Item Weight	565 Grams
Lens	Standard
Lens Coating Description	Super Layer Coating
Lens Design	Zoom
Lens Fixed Focal Length	50 Millimeters
Lens Mount	Sony A
Manufacturer	Sigma Corporation of America
Manufacturer Part Number	17-50mm F2.8 EX DC
Maximum Aperture	2.8 f
Maximum Focal Length	50 Millimeters
Minimum Aperture	22.0
Minimum Focal Length	17 Millimeters
Model Name	17-50mm F2.8 EX DC
Model Number	58C205
Number of Diaphragm Blades	7
Photo Filter Size	77 Millimeters
Real Angle Of View	72.4 Degrees
Screen Size	3 Inches
UPC	085126928636 085126583620
Unit Count	1.0 Count
Warranty Description	1 Year Limited Warranty
Zoom Ratio	2.94:1

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