Another good night with SQM 21.5+ skies starting at 12:30 AM.
Spent two hours comparing views of same MW objects using first the 17.5mm Morpheus and then the 18mm UFFs in my Lunt/APM 100mm APOs.
Contrast and image sharpness was to my eyes the same which is to say excellent and same number of stars in each noted in open clusters, so they both get high points. No apparent coma or astigmatism noted in either. Eye relief and ease of eye placement similar with a nod to the UFFs for my eyes....YMMV.
Big difference was the apparent fov, 65 degrees for the UFFs and 76 degrees for the Morpheus.
In a nutshell, if you like big immersive views with a moderate amount of field curvature 80% out from on axis, the Morpheus are your choice.
OTOH, if you want a really flat field almost to the fieldstop with just a touch of field curvature at the edge and don't mind the smaller apparent fov, the UFFs are it.
Me, I can't decide....
Edited by Mr. Bill, 13 June 2018 - 02:53 PM.