from top of eyecup (big 42mm diameter eyecup) to center surface : 23mm
Cornea is at the limit of the top of the eyecup for me.
My review was done at a club Star Party, not alone...
Thank you for this information. I didn't see anything like it on the first link you provided, although it could have disappeared in Google Translate (though I did search the original page for "relief", which appears to be spelled the same in both languages).
Can you give me the Z-dimension from the highest part of the body to the center surface of the eye lens with the eyecup removed? (In other words, how far is the center of the eye lens recessed into the metal body?) I suspect I'll need almost all of that 23mm.
I did not speak about eye relief in my review, we did it "blind" at night, so it was or was not comfortable to see in the eyepiece. As everyone used it without questionning we did not mesure. In fact, I swap it in the focuser with the Nagler 31T5 and had got the member impressions.
I redid the check, from center to top aluminium M43 thread : ~10mm (not touching lens)
rubber eyecup to top of aluminium M43 thread ~16mm -4mm -> 12mm
So from top of the rubber : 22 to 23mm as I checked last time
When folded, the rubber is still 3 to 4mm over the top aluminium part (you cannot touch aluminium : a thin rubber protection avoid it)
so 13 to 14mm over the center of the eye lenses when using my eye glasses
I can see all the field with eyeglasses when folding the rubber eyecup, image is clean. (I still have a little margin outside the field stop and the visible eye lens part is around 35mm diameter)
We did not questions this point when whe tested it at night : was considered eyeglasses friendly
Ergonomy of this eyepiece is good : better than LVW, Hyperion, Morpheus, Zeiss OPMI 10x22B i have
I never believed to given datas about eye relief.
It depends much on your physiology.