The following Ostara PL 20mm eyepiece review was posted on an internet forum.
I have an ostara 20mm plossl in my collection that I picked up recently. I can’t compare it to anything really posh cos I haven’t got anything like that.
But it is massively better than the standard 20mm celestron ep my scope came with and is just as clear as the second hand Japanese circleT 20mm Ortho I got for Christmas – but with a much wider fov. I bought the ostara as a cheap ep to combine with a cheap 0.5 focal reducer for my 70 mm frac as a guide scope, but I do find myself using it as a normal ep in my main scope for the Pleiades etc and its v.nice