53mm x 145mm spotting scope
thingiverse
The eyepiece end is designed for a friction fit 1 1/4 inch standard eyepiece. Surplusshed.com sells a roof prism you can mount in the end of the eyepiece barrel to erect the image. Tube length is optimized for focul length 53mm diameter objective achromat lens. This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/8XYmIzEv3GU145mm
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