The Baader Planetarium 1.25"/2" Expansion Adapter enables use of 2" eyepieces in 1.25" focusers and diagonals (of course, some vignetting will occur with larger 2" eyepieces). The 1.25" nosepiece is threaded for 1.25"filters, and the internal surfaces are fully baffled to control stray light reflections. Optical path length is 49mm and the adapter weighs 6.7oz.
The expansion adapter's modular construction permits other uses. The 1.25" nosepiece may be removed to expose an internal T-2 photo thread, enabling connection to all the other Baader Astro T-2 accessories. Also, the T-2 threaded ring may be removed to expose a 2" SCT thread.
Baader part numbers: # CLEXA-2 and # 2956215