Jack's post here in a recent thread got me to thinking. I would be very interested to see the variation in character in the look of images shot with different lenses of identical focal length - whatever the focal length may be. As has been pointed out to me, threads exist that discuss "Which 28mm?", "Which 50mm?" etc. However, while such threads contain example images, they normally have been provided by a range of forum members and therefore are of different composition and captured using camera settings that may be dissimilar.
What I am interested in seeing in this thread is images of identical composition shot with identical camera settings. With all else equal, or as near as damn it, the difference in character in the look of images from equivalent lenses - whether it be large or small - should be more readily apparent and may help to inform others' purchase decisions.
Now, unfortunately I do not happen to own lenses that are identical or overlap in focal length, so cannot kick start the thread. Therefore, if this thread is to make it past a single post I will need your help, if you are willing.
I suspect the lens that most own two or more copies of in the same focal length will be 50mm. However, if you own two or more copies of any other focal length then by all means include them. This thread is not about comparing one focal length, but about sets of comparable images for any focal length. Nor is it restricted to primes - if you wish to compare a 50mm prime to a 24-70mm zoom @ 50mm then by all means do. My only request is for the following to be identical for each set of images posted:
1. Composition. Marginal differences in FOV between prime lenses of stated identical focal length can be ignored
2. Placement of focus so that if need be we can inspect the identified area knowing that difference in field curvature between lenses will be small
3. Camera settings, principally aperture but ideally all others
Finally, a couple of questions:
I have read several times that the character of a lens is at least in part a function of optical aberations. Hence, given that lens aberations are visible at larger apertures more so than small, I conclude that the character of a lens changes as one stops down the lens. Do you agree? If not, why not?
In addition, the character of the look from lenses is normally noted when a fast lens is the topic of discussion and it is shot wide open or close to it. Therefore, I conclude that not only does character change as one stops down, as noted above, but that it reduces. Again, do you agree? If not, why not?
Thanks in advance for posting any sets of images from identical focal length lenses you own.