It also depends on the numerical aperture in the eyepiece design.25585 wrote: Tue Jul 06, 2021 9:52 pmEye positioning is one factor, eye positioning and seeing the whole FoV, or being able to without any optical aberration, that is the whole equation. With Morpheus its solved, as much as can be, for me.Don Pensack wrote: Sun Jun 20, 2021 2:16 pmLong eye relief eyepieces used without glasses always require some experimentation to find the right position. Some LER eyepieces don't have a tall-enough eyecup for easy use, but the Baader Morpheus is not one of them. If the extender is added and the eyecup is flipped up, even people who prefer to have the eyecups touch their faces can use the Morpheus eyepieces without blackouts. With the eyecups in the Down position and no extender is added, the eyepieces will be suitable for glasses use at the eyepiece, but the non-glasses wearer will find the eyepieces difficult to use. The "effective" eye relief of the Morpheus eyepieces is longer than the "effective" eye reliefs of the XW series.Bigzmey wrote: Sat Jun 19, 2021 9:36 pm
But, that applies to any EP. Once you find the right eye position the EP works. My point was that for some EPs finding and maintaining that right position is harder than for others. Well designed EPs should guide you to that position and it should be easy to dial-in right height for the eyeguard.
Why some optical designers can achieve this, but others with smaller AFOVs, seem unable &/or unwilling to, is a puzzlement.
Changing the materials prescription, Baader has enlarged the numerical aperture on the BCOs, and herewith you get a more comfortable eye relief.
It is more tricky on the complex designs of the eyepieces, but again doable.
Best,
JG