Kowa TSN-AR42GT 42mm Standard T2 Fit Adapter Ring with Protection Glass T-mount This is also the extension

This is also the extension bar for the CEM40/60/70 GEM45 mounts

AUX Operation temperature -10°C ~ +40°C Pier/Tripod Optional pier Warranty Two year limited OTA size and length dependent

The tube offers a focal ratio of f/10 with the added versatility of Fastar (see below)

Baffles have been added to increase contrast and AR coatings are optimized for the 656nm wavelength

and coin shooting

Kowa TSN-AR42GT 42mm Standard T2 Fit Adapter Ring with Protection Glass T-mount This is also the extensionAdapter Ring to Combine the TSN DA10 or TSN DA20 Digiscoping Adapters With T2 Rings Integrated Protective Glass Prevents the Camera Sensor From Becoming Dirty