Category:Reversed Kellner (RKE) eyepieces

Media in category "Reversed Kellner (RKE) eyepieces"

This category contains only the following file.

RKE 1970.png 450 × 200; 12 KB

Retrieved from "https://commons.wikimedia.org/w/index.php?title=Category:Reversed_Kellner_(RKE)_eyepieces&oldid=42530917"