Edmund RKE a classic or outdated?
- WilliamPaolini
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Re: Edmund RKE a classic or outdated?
U.S.A.F. Veteran - Visual Amateur Astronomer since 1966 - Fully Retired since 2019
8" f/5 Newt - Lunt 152 f/7.9 - TSA 102 f/8 - Vixen 81S f/7.7 - P.S.T. - Pentax 65ED II - Nikon 12x50 AE
Pentax XWs - Baader Morpheus - Takahashi LEs - Edmund RKEs - BST Starguiders - 6ZAO-II/5XO/4Abbe
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- Don Pensack
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Re: Edmund RKE a classic or outdated?
But by the time you get to the exit pupil of the eyepiece, your eye's perspective of the wide black area surrounding the lens narrows down to just a thin black line around the field.
Pull back from the eyepiece because you are uncomfortable only 10mm away from the glass, and the thin black line around the field becomes wide and thick again.
The black line around the field does not completely disappear, but then it doesn't completely disappear on the RKE either, it just appears to be very thin.
It's a type of foreshortening, though not that used in art.
I only referred to the Zoom to point out that an eyepiece doesn't have to have a lot of eye relief, or a large eye lens, to display this characteristic.
It merely has to have a perspective, from the exit pupil, of the top of the eyepiece that makes little of the aluminum barrel outside the eye lens visible to the eye from that position.
Currently using a 12.5" dob and a 4" apo refractor
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