Hopefully, to sort, categorize, date, etc. Edscorp's RKE Series of eyepieces & accessories...
Bust some Myths, and maybe support the Legends...
Thanks Bob, but not this time. I'm not sure of dates at all, more going after mechanics and some test viewing. Sorting, catagorize, open each focal length to look at the design, check out things like Terra's comment since I have all those out, that sort of thing. Now what scope to use for quick checks, preferably and Edmund, super simple quick grab n go with some decent aperture, more aperture than a small grab frac...hmmmm ideas?
I had the one with the black anodized metal body one that was marked 1 1/8. I sold it because I had a lighter weight, blacker red band version marked 28mm RKE at the same time and in side by side examination in several different telescopes, I liked the red band version better. I like it to this day. In fact I used it just last Sunday night in my Vixen ED102SS. It really does give that floating in space feeling. To me, it’s the classic Edmund RKE that everyone should have in the tool kit.
The 1-1/8" is very similar to a Plossl. The RKE is similar to a Konig. Different eyepieces.
Some notes in passing. Any chips (clams) were all in the field facing surface that contacts the lower barrel. Two blackenings shown in the photo, the small one didn't need to be done. With this number of eyepieces at one time, it became obvious that the field surface shows the most 'wear' for lack of a better word. This is the surface that would take rotational contact from the lower barrel. I don't see any concern from it. The chips are from being too tight. The two assembled units on the Right had some small spots in the same edge I blackened.
One of the eye lens in a 1-1/8" was flipped. All the 1-1/8" are done and out of the picture. I did a swap comparison and definitely prefer the RKE in an Astroscan. The SAE has a larger AFOV by way of no field stop control. The RKE has a sharp edge of field, the SAE is a rotten blur.
From the left:
An empty body I found with no optics.
The orange band had to come apart for cleaning. It was locked tight and took two strap wrenches, no damage to the glass or threads.
The next three are the red band with the big black clam and two early black body, all previously shown.
The last two are 28 RKE that were nice enough to not take apart for any reason till I found the lens assemblies both scrambled order eggs.
The big clam still makes an excellent eyepiece. The clam is shallow and that edge is hardly visible from the eye end compared to looking at it directly from the back. The thicker barrel covers it too.
Edited by apfever, 14 October 2021 - 11:52 AM.