When doing afocal astrophotography special eyepieces might be needed.

The GSO 32mm and 40mm photo eyepieces are Plossl eyepieces but the eye rubber can be removed revealing a T2 thread. This T2 thread can accept many different adaptors. Using the proper one almost all of the cameras can be mounted and breathtaking images can be captured. Using a bayonett adaptor even DSLRs can be used.

The T2 thread distance can be adjusted, so the important camera lens - eyepiece distance can be finetuned, or using a DSLR the magnification can be adjusted slightly. Using the eye rubber the eyepieces can be used for visual purposes just like any other eyepiece.