Adapter with T2 (M42x0.75) thread at 1.25 "allows, among other things:
• attaching the eyepiece behind the filter wheel equipped with the T2 thread outlet
• attaching the eyepiece, angular connector or other accessories in the 1.25 "standard with a device equipped with a T2 thread, eg to connect a telephoto eyepiece with a T2 output (MTO 1000, Rubinar, Tair, Falcon, Samyang and many others), thanks to which our telephoto lens will turn into a telescope / telescope (it's worth checking on the spot in our stores about the sharpening of a particular configuration).