First light on my Baader Hyperion. Star test suggest Pickering 3 to 4 so not a great time to do much testing. I used Saturn for my first evaluation. Excellent on axis focus. Focus began to deteriorate at about 80% which was mostly correctable by refocussing. With a 2X UO 2" barlow the focus improved to about 90%. At the edge some chromatic aberation was evident with blue violet at the outer edge and a faint green tinge on the inner. A little minor distortion at the edges of the field was noticed. Had some difficulty with kidney bean especially with the barlow, causing some head movement to find an image. In fact a few times the field was totally black until eye position over the EP was found. When tracking Saturn to the edge of the field some improvement of focus was possible with head movement but the result was a field of view shaped like an elongated football with minor axis about 10% of the diameter of the FOV, the rest black. Have not noticed this in other EPs. Did not have the opportunity to compare the EP to a Stratus 13mm or use it on another scope. Hopefully in a few days. Friend has both the Stratus 13mm and an orion 12" Dob. Observations of a rookie, YMMV.
I Yam What I Yam!
