2" to 1.25" Self Centering Lock adapter featured the optical length is the

the optical length is the same as the overall physical length

● Calibrate the effect of sky brightness on qualitative measures such as the Bortle Scale

Thickness: 28 mm

Specifications

60 degrees wide angle field of view (FOV) with quality images across the whole FOV

2" to 1.25" Self Centering Lock adapter featured the optical length is the2" to 1. 25" Self Centering Lock adapter Self Centering Visual Back 2" to 1. 25" with M48 Female Thread It is practically a 1. 25" eyepiece holder visual back that can be plugged into a 2" eyepiece holder, thus effectively converting 2" into 1. 25", but with quick locking and self centering ability. This makes for quick an easy eyepiece swapping with no fiddling with locking screws. Also particularly suited for imaging due to the self centering