If you're using an UWA lens from ground height directing across the street, wouldn't that mean that two corners have sky instead of trees? And if you direct it downwards to fill those two corners with something other than sky, wouldn't the other two corners point to much close distances? I think you need to stand atop a very tall building for all corners to have subjects at roughly the same distance.
Here's my first attempt (1.5MB JPEG) to try this method. I think it's pretty self explanatory. I shot this using a Sony A77 MkII with 16-50/2.8 at 16/2.8. I think the right side is a bit sharper, but not sure that if was buying this lens second hand the difference would have been alarming enough to skip it. I don't expect perfection at the extreme corners when shooting wide open, only that the results would be close enough to not indicate a faulty lens.
Thoughts?
Here's my first attempt (1.5MB JPEG) to try this method. I think it's pretty self explanatory. I shot this using a Sony A77 MkII with 16-50/2.8 at 16/2.8. I think the right side is a bit sharper, but not sure that if was buying this lens second hand the difference would have been alarming enough to skip it. I don't expect perfection at the extreme corners when shooting wide open, only that the results would be close enough to not indicate a faulty lens.
Thoughts?