I posed this question in march regarding the 10-20mm lens sigma you suggested that get from amazon not third party you said returning is easy if its a bad copy so how do i check the lens to ensure its a good lens what are the things i should check once i receive it, appreciate all that you do not many people do this-Nik
Sunday, March 9, 2008 10:24 PM
Yongbo im trying to decide between the 10-22mm canon lens and the sigma 10-20mm lens any suggestions
yongbo:
Hi Nik, The copy that we have (Canon 10-22mm) is sharp from corner to corner. Canon have two rebate programs every year, the spring program should be started soon when people get their tax return back. Normally, it's $50 on that lens. The Sigma 10-20mm is a high quality lens too, as long as you get a good copy, there is not much difference between these two lenses. So, I will recommend Amazon.com (not 3rd party), since they pay shipping for exchange
Hi Nik, Since that lens is so wide, you need to take some pictures with a lot of details. Try put it on tripod and take a picture of a brick wall at 10mm, use f/4 and f/8. Post the original pictures on
Picasa or
Flickr. Post the question on
Canon SLR Lens Talk Forum on Dpreview.com with link to the original pictures. People who own this lens will tell you either it's good or not. Soft corner is quite common, for example, here are some 100% crops from my P&S, the Canon SD800 IS:
http://www.photo96.com/blog/?p=76, the corner is soft/blurry, for P&S, it's acceptable. This is the kind of test that people expect to see. As long as the lens is not terribly wrong, a little bit effort in post processing will make a big difference, here is an example:
http://www.photo96.com/blog/?p=242, the software is Digital Photo Professional, which came with most of the Canon DSLRs. Good luck!