Eyepiece Defects

Hi all,

Anybody know where there is a collection of photos on the web (or in a book) that show what various lens defects (astgmatism, color, bad edge sharpness, poor contrast, etc.) look like in a real eyepiece?

Alex

Although the context is primarily microscopy, these are just fabulous.

http://www.microscopyu.com/tutorials/java/aberrations/curvatureoffield/index.html

http://www.microscopyu.com/tutorials/java/aberrations/astigmatism/index.html

http://www.microscopyu.com/tutorials/java/aberrations/distortion/index.html