Quote Originally Posted by Paul_Baker
Check this page out. It shows the darkening of the corners at 1.4 very clearly.

http://www.physics.montana.edu/stude...g/50mmTest.htm
This is exactly what is happening. As long as it's not something wrong with my lens, then I'm fine with it.

Stefan,
I can appreciate your advice. I will use it to my advantage and at least I know now that I can stop down to lose the effect. I've taken some great shots wide open with this lens, that wouldn't have been possible had I not had the extra stop.

Thanks to everyone,
Ara