Adjustable Monocular Scopes

thingiverse

Here are a few simple adjustable scopes that I've made. Each scope only requires 1 concave lens (25mm, 38mm, or 50mm) for the eyepiece, and 1 convex lens (50mm or 75mm) for the objective. Magnification will typically range from 1.5x–10x depending on the focal length of your lenses. I included a few helpful files for determining the correct focal length and distance between lenses needed to get a desired magnification. The basic assembly is as follows: 1.) *[25mm→50mm Scope]* 25mm Parfocal Extension (optional) → 25mm Eyepiece+Arm → 50mm Objective → 75mm Adapter (optional) 2.) *[38→50mm Scope]* 38mm Parfocal Extension (optional) → 38mm Eyepiece+Arm → 50mm Objective → 75mm Adapter (optional) 3.) *[50→75mm Scope]* 50mm Eyepiece → 50mm Arm → 75mm Objective **Notes –The parfocal extension is only necessary for higher magnification which require a greater distance between your eyepiece and objective lens. –I made the 50mm Eyepiece and 50mm Arm models separate to make it easier to print. –Higher magnifications will show a greater amount of spherical aberration (unless you use achromatic lenses) –It's best to use a very powerful concave lens (i.e. Focal Length = -5cm or smaller). This will allow you to more easily achieve higher magnification at a shorter distance. –Your convex lens will most likely need to have a focal length between 10cm and 20cm. Let me know if you have any question!