Originally posted by stevebrot It took me awhile to find them, but here are two images with similar composition, un-cropped, taken from different positions using different focal length lenses. They were posted as part of a similar thread about 18 months ago.
One was taken with a 50mm and the other with an 85mm. Both lenses were at f/5.6. The challenge put forth was to label which was the 85mm without peeking at the exif. (Hint: You can tell from the difference in perspective...)
Steve
this is very easy Steve. basing from the OOF background, the first pic is the 85mm while the 2nd pic is the 50mm.
btw, what you did here is a tough task since you needed to recompose the photo at a certain angle that it would look the same with the other photo.
with a definite background as a basis, one could easily identify which lens is which. but this task however is difficult to judge if the background is plain single colored wall or the the subject is completely isolated by wide open aperture brightness.