iOptron iPolar Electronic Polarscope for CEM40 Internal mount - 3339A-040 type-digital-ccd-cameras 20") Diopter Adjustment Range ±

20") Diopter Adjustment Range ± 3 diopters Twilight Factor 17

The M42 Spacer Rings are made so as to be compatible with M42 x 0

With the NexStar 90'''s you can see breathtaking views of the lunar landscape

soft bag Camera Adaptable No SmartPhone Adapter Yes

iOptron iPolar Electronic Polarscope for CEM40 Internal mount - 3339A-040 type-digital-ccd-cameras 20") Diopter Adjustment Range ±iOptron iPolar Electronic Polarscope For CEM40 Internal Installation Mount The iOptron iPolar Electronic Polarscope is a high precision easy to use polarscope which combines an optical system which detects star patterns in the night sky by means of an internal electronic camera and uses software on your PC to determine the position of the polar axis with respect to the celestial poles. This is not an optical polar scope in that you cannot look through