Askar 52 mm f/4 Guide Scope - Black - 52F4GS-B vendor-explore-scientific and now you have four

and now you have four magnifications to choose from

5" Focuser Extension Tube

while the top portion consists of a dual Vixen/Losmandy saddle with two knobs to secure the other (optional) rail within it

This three element

the CEM70ECW is a solid performer for observers and imagers alike

Askar 52 mm f/4 Guide Scope - Black - 52F4GS-B vendor-explore-scientific and now you have fourAskar 52mm f 4 Guide Scope in Black The Askar 52mm F4 Guide Scope is lightweight, compact, and stable. The large aperture is 164% larger than that of the Askar 32mm F4 guide scope, with the substantial increase of light the limiting magnitude can reach 10. 4. The optical design of the doublet objective lens, as well as the precise X&Y axis fine adjustment, gives this 52mm f 4 guidescope great accuracy and stability while the OTA weighs in at only 0.