



It takes patience to test a lens
I am new to DSLR photography having just moved from Canon point-and-shoot in September 2009. I purchased the Canon XSI with kit lens EFS 18-55mm and in the same order I bought the EFS 55-250mm. For the first couple months I used the full auto function and was disappointed in the results because they were not any better than the Canon PowerShot -- not bad but I expected more. Then I bought a DVD beginner course in DSLR photography for the XSI and started using the 'creative modes' and my pictures improved a great deal. I bought two more lenses the Canon EF mm50 1.4 and for some reason the competing EF mm50 1.8.
So for the last few months I have been taking many pictures with all four lenses in series starting with wide aperture and incrementally closing, which of course changes shutter speed and depth of field. Then I would use the shutter priority setting and play around with the white balance and the ISO setting. Then I carefully studied the pictures on my wide screen computer monitor and increased magnification to look more closely at the edges and color. I would try to determine for each lens the affect of aperture, shutter, ISO, white balance on the quality of the pictures.
I have found that I can get good and bad pictures from any of the lenses. However, the EFS 55-250 is probably the most consistent in terms of decent quality -- a little better than the kit lens. And of course it is a telephoto lens. The mm50 1.8 takes very sharp pictures but the mm50 1.4 can really take some beautiful color and the bokeh is wonderful. I like them all!
I guess that as I get more experience I could change my mind and of course there is still the wonderful world of the 'L' lenses.
2010-03-03