The Variable-Projection Camera Adapter includes a sliding mechanism, permitting variable projection distances during eyepiece projection photography, avoiding the need to switch to higher power eyepieces when additional projection enlargement is desired.
Each complete Meade Variable Projection Camera Adapter (camera not included) consists of two separable units for either prime focus or eyepiece-projection photography.
Please Note: The Meade Variable Projection Camera Adapter was created to work with Meade Series 4000 eyepieces. These eyepieces have very little extra width throughout the length of the eyepiece, and so slip easily inside the tube when doing eyepiece projection photography. If the eyepieces you plan to use with this adapter are wider at any point, or have an eyecup that is not removable, they may not fit inside. Many people end up buying a specific eyepiece just for this purpose because their visual collection consists of beefier, tricked out eyepieces. Hope this helps!