I used a Canon Ef 24-70mm f2.8 L USM Lens for the purpose of this tesing.
http://www.leedervillecameras.com.au/slr-lenses/canon/canon-ef-24-70mm-f2-8l-usm
I found it to be a reasonably consistant lens but it does feature some barrel distortions and slight vignetting. Below are the visual results of the lens test ranging from f2.8 through to f22 at two different focal lengths of 24mm and 70mm which is the extent of this lens range. This practical test gave me a better understanding as it allowed me to view this not just read about it. I consider myself a very visual learner and I really found a lot of benefit from this test.
I found that at its widest point of f2.8 there where some very noticeable barrel distortions particularly at 24mm focal length. There is a degree of light fallout at this same focal length and wide aperture but it seems to have dissapeared at f5.6 as well as when it is zoomed to 70mm.
This lens is generally used as a portrait lens and there for the distortions that are present shouldn't have as great as an affect that it would if shooting architecture. This lens appears to be at its sharpest at around f4/f5.6. I am looking to add a new lens to my kit and I know that there is similar research to this on the internet. I will now be able to interpret these online results better to find the perfect lenses for me.
f 2.8 @ 70mm
f4 @70mm
f 5.6 @ 70mm
f8 @70mm
f 11 @70mm
f16 @ 70mm
f 22 @ 70mm
f 22 @ 24 mm
f16 @ 24mm
f11 @ 24 mm
f8 @ 24mm
f5.6 @ 24mm
f4 @ 24mm
f2.8 @ 24mm
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