Can we zoom using Canon DSLR's?

[belial]

Are you sure this lens is a waste of money?

It's known for being poor quality. I wouldn't worry about the $500 70-300 either. It's a little better quality than the 55-250 for twice the money and a little less than the much better 70-200 4.0

 

[belial]

I got that lens with my T21 (550D) as part of a bundle. It is an OK lens. Not great, not fantastic, just OK. I've tried using it off tripod with very mixed results, some of which could simply be a lack of technique on my part. The sharpness of the photos take does tend to drop off the farther in you zoom.

The sharpness of that lens isn't known to be that great. As for off of tripod make sure you're getting fast shutter speeds to handheld a telephoto. At full zoom you should be trying for 1/400ish-1/500ish at least. Also work on your handholding technique.