Do you have a T-2 thread on your telescope or accessory, but want to adapt it to a standard 2" eyepiece? The 2" eyepiece to T-2 thread adapter allows you to do this straightforwardly for eyepieces or cameras with a 2" connector. The possibilities are incredibly diverse - connecting to a filter wheel, to another adapter with T-2 thread, with an off-axis guider for astrophotography or visual observing. The most common adapter types in amateur astronomy are the 2" and T-2 standards. This allows you to find the right solution.