PUREBRAD wrote in post #14627191
Can you explain what you said?
I don't own an 85L, but kinda curious about that effect.
On the left side of the image, the circles have a slice missing on the right side of the circle.
On the right side of the image, the circles have a slice missing on the left side of the circles.
Is this particular to the 85L?
The contacts on the 85L are essentially mounted on the glass, blocking part of the image. To see this effect in action, you can take a piece of thick paper, cut a square or other shape into it and place it over the front of the lens. With the lens wide open you can throw it out of focus (hopefully with some specular highlights in the background) and move the lens around. As the out of focus elements move around in the frame they'll encounter the cut out and be partially blocked. The OOF specular highlights are essentially being flagged by the cut out (or in the case of the 85L the contacts) when at an oblique angle to the lens. IMAGE LINK: http://www.flickr.com/photos/tltichy/6553914867/ Mickey Mouse Lights
I have an example here of a cut out in front of a 50L wide open that demonstrates this:
, on Flickr
If you look you'll notice that not all of the "mickeys" are complete. Some of them are cut off in various areas, despite all being created by the same cut out on the lens.