I rented this lens before I purchased it new. The rental appears to be an excellent copy so I was hoping the one I purchased would be too; unfortunately, it was a disappointment compared to the rental.
I tested this lens using stars. Stars are the toughest test for a lens, but they really show the lens' aberrations quite easily. I would like your thoughts and opinions on this lens. For example, is it a poor copy? If so, what do you think is wrong with the lens (e.g. De-centered, field curvature, etc.)? I have sent this lens to Canon for repair. I felt it had a De-centering problem. Upon return, the De-centering problem seems fixed, but now it seems to have a very bad field curvature problem. I'm no optics expert so perhaps something else may be wrong with lens. I plan on sending the lens back again with more data showing the problem I'm experiencing. I have included several links showing the rental lens and how it compares to my lens at each stage. The images are approximately 1.5 MB each.
I focused using LiveView with a 10X loupe using the belt stars of Orion near the center of the frame. The stars are trailing slightly due to using a fixed tripod.
As mentioned before, I just can't imagine how a $2200 lens can perform so poorly, especially since it is designed to cover 67mm. My TS-E 17mm is substantially better wide-open (see the last link). It is possible I have too high of expectations for the TS-E 24mm or just have a very bad copy.
Rental shifted 10 degreeshttp://www.northwest-landscapes.com/images/testing/ts-e_24mm_shifted_10_degrees_rental.jpg
Purchased shifted 10 degreeshttp://www.northwest-landscapes.com/images/testing/ts-e_24mm_shifted_10_degrees_purchased.jpg
Purchased non-shifted "fixed"http://www.northwest-landscapes.com/images/testing/ts-e_24mm_non-shifted_purchased_fixed.jpg
Purchased shifted 10 degrees "fixed"http://www.northwest-landscapes.com/images/testing/ts-e_24mm_shifted_10_degrees_purchased_fixed.jpg
Purchased TS-E 17mm for comparisonhttp://www.northwest-landscapes.com/images/testing/ts-e_17mm_non-shifted.jpg