Male thread - M42X0.75; Female thread - M42X0.75; eliminates a range of focusing problems
The extension tube has a T2 interior thread and a T2 exterior thread for elegantly solving spacing problems in astrophotography.
Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners
Variable 60 mm finder with 10x magnification with illumination and light-gathering guide scope for astrophotography; aperture 60 mm and focal length 248 mm; convenient 45 degree view with upright and non-mirrored image;
24.8 mm dual-crosshair with illumination adjustable in 7 steps; battery is coin style CR2032 not included; practical focusing with sliding focuser with rotation;