This eyepiece was suggested as a low power, widefield eyepiece for my 10" f/5 newt.
I had the opportunity to test this eyepiece at Kulnura on Saturday night, thanks to Joe (astropolak) who owns one and let me borrow it for a little while.
First impressions - the eyepiece is HUGE! It's a 2-inch (only) barrel, and the body of the eyepiece is massive. The eye lens is quite large.
It felt quite comfortable to use, the eye relief felt about 15mm, and upon looking at the specs just then, it's quoted at 18mm so I was close
The field of view felt large, the specs say 82 degrees and I'd guess this is right.
Unfortunately I don't have any more good things to say about it.. the eyepiece has
shocking field curvature in my scope. The outer 30-40% of the field is not in focus when the centre is in focus, and if I focus for the outside, the inside goes out of focus.
When the stars were in focus, they were quite crisp and sharp and there was little evidence of astigmatism at the edge of the field.
However the field curvature is terrible and I just could not use this eyepiece on a regular basis in my scope. It was really distracting and a big put-off.
I did look through it again later in Joe's 8" f/10 LX90, and the field curvature was still there, but only in the outer 5-8% and was certainly not nearly as distracting.
At US$400 it's not cheap, and I would not recommend this eyepiece to anyone with a fast scope.