DIY ~18mm Eyepiece for Public Viewing

[Rocket_the_Raccoon]

Ingredients:
- eyepiece from an old 10x50mm (5-degree FOV) binocular
- 35mm film can (...the 1.25" eyepiece barrel)
- rubber cup from another old eyepiece (...installed in reversed)
- superglue, masking tape, Tamiya XF-1 flat-black model paint

Using my Celestron stock 3-element stock 20mm as a reference, this DIY eyepiece has a focal length of approximately 18mm and a AFOV of around 45~50 degrees. Image quality falls slightly behind the Celestron but it is not very obvious. However, it makes a good general purpose eyepiece for public viewing.