"Diffraction Limited" means that the limits of image detail are determined by the physical properties of light, and not by optical defects in the telescope.
Instead of a single thumb screw locking the eyepiece in place, a brass ring compressed by a thumb screw secures the eyepiece. This spreads clamping force over a larger area of the eyepiece's barrel, which provides a better connection. The compression ring also prevents the tip of the thumb screw from producing unsightly scratches and divots on the eyepiece barrel.
Weight (oz.)
5.21
Warranty
One year
Included Items:
5/27/09 9:05 PM
1.25" Orion Prism Star Diagonal
Reviewer: G. Wang
When I popped this baby in to my scope, it was
severely miscollimated. Stars looked like comets
even at low power. I could tell by the defocused
image that it could be a good diagonal if aligned.
After some tinkering, the prism was aligned and it
gave very nice images of Izar and Saturn in my
100ED. I needed a diagonal in a bad way, so
returning wasn't an option, but the story has a
happy ending. It's a nice diagonal if it comes
aligned.