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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📸 Elevate Your Photography Game!

BUILT TO LAST - Includes a durable carrying case and lens hood, so you can take your creativity anywhere without worry.
UNMATCHED CLARITY - FLD glass technology delivers image quality that rivals fluorite, providing sharp, vibrant photos.
CAPTURE EVERY MOMENT - With a versatile 17-50mm range, this lens is perfect for everything from sweeping landscapes to intimate portraits.
SMOOTH FOCUS TRANSITION - Ultrasonic focus type ensures quick and silent autofocus, making it ideal for both photography and videography.
BRILLIANT LOW LIGHT PERFORMANCE - The large f/2.8 aperture allows for stunning shots even in dim conditions, ensuring you never miss a moment.

The Sigma 17-50mm f/2.8 EX DC OS HSM FLD lens is a high-performance standard zoom lens designed for Nikon digital DSLR cameras. With a large aperture of f/2.8, it excels in low-light conditions and offers exceptional image stabilization. The lens features advanced FLD glass for superior clarity and a versatile zoom range, making it an essential tool for both amateur and professional photographers.

Real Angle Of View	72.4 Degrees
Maximum Aperture	2.8
Minimum Aperture	22
Zoom Ratio	2.94:1
Image stabilization	4 stops claimed
Photo Filter Size	77 Millimeters
Lens Mount	Nikon F
Number of Diaphragm Blades	7
Minimum Focal Length	17 Millimeters
Lens Design	Zoom
Focus Type	Ultrasonic
Lens Fixed Focal Length	50 Millimeters
Lens Coating Description	multi-layer coating
Focal Length Description	17-50 millimeters
Lens	Standard
Compatible Camera Mount	Nikon F (DX)
Maximum Focal Length	50 Millimeters

Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Nikon Digital DSLR Camera

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