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This Pentax M42/Universal Screwmount Lens to Telescope Adapter - to Convert Lens to Telescope allows you to convert your "universal" (M42) screw lens into a telescope. By attaching this eyepiece to the back of a lens you can now view directly through the lens, as you would with any standard telescope.
Not ideal for terrestrial viewing, since no erecting prism is included in this design.
In the Box
General Brand M42/Universal Screwmount Lens to Telescope Adapter - to Convert Lens to Telescope