This diagonal provides excellent views, it is 1/8 wave and has 96 to 97 percent transmission.
I bought this diagonal used several months ago for my Nighthawk but don't need it anymore because I just sold that scope. There is one tiny mark on the mirror which doesn't effect the view as far as my eyes can tell and there are numerous set screw marks around the barrel part that goes into the focuser tube. Other than that it is in great shape and performs wonderfully. The diagonal itself is threaded for 2" filters and I will also include a 2" to 1.25" eyepiece adapter from scopestuff that is also threaded for 2" filters.
$80.00 shipped - I prefer paypal (no extra fee).
Thanks for looking,