Edmund Scientific RKE 21mm

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Brand and Model:Edmund Scientific RKE 21mm
Price ($USD):$39.95
Focal Length:21.5 mm
Barrel Size:1.25 in
Apparent FOV:45.0 degrees
Field Stop Dia.:17.3 mm
Eye Relief:19 mm
Weight (lbs):0.4

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Edmund Scientific RKE 21mm
I love Al Nagler's wide-fields, but for lunar and planetary work at high power I found a nice surprise in the Edmund's Reversed KEllner (RKE). Even when you barlow them in PowerMates 2.5x (or 5x) they show me greater detail. I use them in my Portaball 12.5" (with legendary Zambutto mirror) and my Tak SKY90.
I wish they were supplied with rubber eye cups, I prefer my eye to touch the soft rubber rather than the metal. But I will try to buy them somewhere.

Overall Rating: 10
Optics:10 Value:10
Weight: 10 (Trustworthy Vote)
By: 4rBetter
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=130487

Edmund Scientific RKE 21mm
I've owned the complete set of RKEs for over a decade. They are well made and threaded for filters. They are sharp edge to edge, no noticable distortion and bright. These are not kelner type eyepieces, I have two kelners and the RKEs are far superior. They are nearly identical to the plossels I have, a bit brighter and a little more eye relief, but a slighty narrower field of view. All said, I think these are the cheapest good quality eyepieces available and a good value.

Overall Rating: 8
Optics:8 Value:9
Weight: 5 (Veritable Vote)
By: mhpdfp
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=123694

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