The YZ 2″ Universal Diagonal is an Astro Dog favourite.
It’s universal because it comes with a replacement tube that steps down from 2″ to 1.25″ natively, and then allows both 1.25″ and 2″ eyepieces. You can:
– Attach it into a 2″ telescope slot, allowing the use of 2″ eyepieces
– Attach it into a 2″ telescope slot, allowing the use of 1.25″ eyepieces
– Attach it into a 1.25″ telescope slot, allowing the use of 2″ eyepieces
– Attach it into a 1.25″ telescope slot, allowing the use of 1.25″ eyepieces
It has a heavy, solid build, features a compression ring and is well collimated.
The YZ mirror diagonals feature superior optical collimation (this has been tested by the SRAA) and very fine mirror polishing for outstanding optical clarity and contrast.
It can later be attached also to a 1.25″ slot by means of an optional adaptor ring (not included) then making it a truly universal diagonal.
nb. Note that it is pictured with the optional 1.25″ adaptor, which allows it to slip into a 1.25″ slot
Customer Review 3/8/2020 : “The diagonal performed admirably last night from my backyard. Everything was in focus right out of the box. Found the build quality of the diagonal to be superb (it’s built like a tank) and as you said, the mirror is very well collimated. Very clear flat views came through the eyepieces.”