Askar 52 mm f/4 Guide Scope - Silver - 52F4GS-S Alpen Teton Binoculars Aperture (mm): 280 mm (11

Aperture (mm): 280 mm (11 in)

The scope comes with a great soft case

18 mm Eye Relief

6mm (25" x 25" x 29") Base Weight: 33

Length:  255 mm

Askar 52 mm f/4 Guide Scope - Silver - 52F4GS-S Alpen Teton Binoculars Aperture (mm): 280 mm (11Askar 52mm f 4 Guide Scope in Silver 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.