The Alpine Astronomical Zeiss DiaScope Bayonet Eyepiece Adapter allows you to use conventional 2" astronomical telescope eyepieces in Zeiss DiaScope spotting scopes. Using this adapter, you are able to greatly increase the power and versatility of the scope, while still enjoying the optical precision the DiaScopes are known for. The adapter has a proprietary Zeiss bayonet to perfectly mount into the scope body, with a standard 2" holder for your eyepieces. To add even more versatility, the adapter is reversible. Installing the adapter on a DiaScope eyepiece and adding an optional 2" or 1.25" nosepiece enables it to be used in telescope focusers and accessories, like Barlows and diagonals.