Quote Originally Posted by kbrede View Post
Thanks for posting this. I went with the 65mm but at some point will probably take a look at the 50mm. What's the "floating optic ring" for?
From what I understand, the floating optic ring controls a piece of focusing glass that is rotated in order to combat astigmatism and promote corner sharpness. I've read that the corner sharpness thing is more noticable at smaller distances though and that most people just set it to infinity and step down. I don't know the optical theory as to what it does, maybe someone smarter than me can tell us more about iit