Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: MAKE SURE YOU CAN RETURN IT, 2ND ONE IS GREAT!!

Review of lens based on Canon 40D:Be sure you can return it because the first one I got was pure junk. All of the images at 70mm f2.8 where unusably blurry.But wait... after returning it to Amazon (which was quick, return shipping paid, and pain free!!) for another copy of the lens it is very sharp and I would consider it acceptable for any amateur as well as professionals on a budget(such as myself).That being said, I should mention that there is a bit more chromatic aberration than I have seen from other lenses but it's acceptable and can be minimized with smart shooting.CONCLUSION:Don't be scared of the lens but do be sure you can return without hassle. All-in-all I am extremely happy with the results of the second lens.