Kitakaru RPL orthoscopic eyepieces?

[AntennaGuy]

These eyepieces don't appear to be discussed often. (There is some discussion on other forums, but I found none at TSS.) Anybody here using them?
Here's a magazine review from 2018: https://www.skyatnightmagazine.com/revi ... eyepieces/
Altair Astro offers them for sale here: https://www.altairastro.com/index.asp?function=search (Note: you may have to search explicitly for Kitakaru, there).
Note: They say RPL = "Really Perfect Eyepiece," but I suspect it previously was "Really Perfect Lens." Gotta like the name.
Altair's site says "The KITAKARU RPL is a modern interpretation of the traditional orthoscopic, producing orthoscopic images and a wider field of view. They are an evolution of the Lavendura series by one of Japan's most respected optical designers and lifetime observer." So maybe the "L" meant Lavendura?

[John Baars]

I use one in my 140 mm f/14,3 OMC maksutov. It is the 45 mm one.
I can underline the results of the review in the link. As to be expected it performs well in that "slow" instrument.
It has a slight drawback in the OMC140 though. Because of the rather small exit of the OMC140, the apparent field of view is vignetted to 55 degrees.
So a 2 inch exit is necessary for the 45mm.

[Bigzmey]

Interesting EPs. The eye relieve is closer to Plossls then Abbe orthoscopic. 62 deg and 4 element design, I don't believe they will be truly orthoscopic in fast scopes.

[Lady Fraktor]

Designed for telescopes slower than f/7.

The original Konig Orthoskop eyepiece has a 60° AFOV and is 4 elements in 2 groups.
A new version perhaps?

I remember seeing these on a manufacturers website a couple of months ago, Skyrover possibly...
Altair Astro must be taking marketing lessons from Skywatcher, the write up is pretty impressive!
Though I suspect in slower optics they will work very well.

[Jones]

Had a 45mm few years ago, seemed ok in my Surplus Shed 5" f/5.5 achro. Just the outer edge was out of focus. Did not keep it long. Really liked the Russell guys lenses, ebay seller, his 55 degree plossls have sharp stars to the edge . If you a wider field go lower power. Ended up with 65, 56, 45mm, 3 for the price of one RPL.

[AntennaGuy]

Thanks all. I've been thinking that one (or two) of the longer focal length Kitakaru eyepieces just might work well with a VMC260L (f/11.5)... that is, if I were to get a VMC260L, hypothetically speaking.

[Lady Fraktor]

Had a 45mm few years ago, seemed ok in my Surplus Shed 5" f/5.5 achro. Just the outer edge was out of focus. Did not keep it long. Really liked the Russell guys lenses, ebay seller, his 55 degree plossls have sharp stars to the edge . If you a wider field go lower power. Ended up with 65, 56, 45mm, 3 for the price of one RPL.

These are not Russell Optics eyepieces if that is what you are referring to but items through Altair Astro in UK.