Sigma-17-50mm f2.8 EX DC OS HSM lens is one of the most successful sigma general purpose lens for any crop sensor camera produced by sigma ever. I bought this lens 6 months ago and since then it is most widely used lens on my canon 600d. Its razor sharp . It has good Optical stabilization. Very good build quality and a bit heavy but any good lens with these qualities normally has some weight because of all the internal mechanisms. It is definitely the best lens if you are moving from kit lens. Although the focal range is pretty much the same as kit lens so a lot of new comers hesitates to buy this as they are looking for some different focal length and hoping that the different focal length will improve their shots . But believe me this lens can take your photography to new level altogether. The amount of sharpness and saturation that you will get with this is simply amazing.
Below is the complete nomenclature of this lens as appeared on Sigma’s website.
- DC:These are special lenses designed for APS-C size sensors so that the image circle matches the smaller size of the image sensor of most digital SLR cameras. Their specialized design gives these lenses the ideal properties for digital cameras, the compact and lightweight construction is an added bonus!
- EX:The exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance.
- HSM:This lens uses a motor driven by ultrasonic waves to provide a quiet, high-speed AF.
- IF:To ensure stability in focusing, this lens moves the inner lens group(s) without changing the lens’ physical length.
- OS:This function utilizes a built-in mechanism that compensates for camera shake. It dramatically expands photographic possibilities by alleviating camera movement when shooting by hand held camera.
I am not going to give a lot of comparison details as I find it useless but I will show you some of my shots taken from this lens and even after that if you are not satisfied, I will share some links to very detailed reviews that you may find helpful.All these photos are taken by me on Canon 600d with this lens.
You can ask any query regarding this lens on my email
imran.zahid 
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