I only have one scope with a test report, from the vendor, I believe done in red wavelength if I remember right. So instead of being 1/8th to 1/9th pv it is probably more like 1/6th to 1/7th. Maybe a bit better than typical mass produced stuff. But it delivers sharp views so I am happy with it. I don’t really think of it as a premium mirror so much as a high quality one. But it is good enough I don’t have an urge to refigure it. It is sharper than the mass produced reflector it replaced.
Likewise I replaced a 100ED with a Vixen ED103S. No idea what the Strehl of either is. But the Vixen provides sharper views.
In both cases, I replaced relatively cheap scopes with somewhat higher end options. In both cases the higher quality scopes deliver better optical and mechanical quality, so money well spent in my opinion. The reflector is no ZOC. The Vixen is excellent but probably not quite as good as a new SVX or TEC or Tak. Not that I have compared it to a premium Apo. For me it is more about the brand reputation than a test report. I mean ZOC doesn’t give test reports. Doesn’t keep people from buying them.
Edited by SeattleScott, 29 June 2020 - 04:49 PM.