ZWO SII 7nm NARROWBAND FILTER GEOPTIK13 Direct drive high torque motors

Direct drive high torque motors specifically designed for the demands of astronomy

With the optional TOA-35FL field flattener

The ZWO off-axis guider uses a prism that deviates part of the light from the main telescope and redirects it to the guiding camera

which is useful for telescopes with short backfocus such as fast Newtonians

Connection telescope side 60 mm barrel Connection eyepiece side 2" clamp Weight 90 g SKU BA6015180

ZWO SII 7nm NARROWBAND FILTER GEOPTIK13 Direct drive high torque motorsThe ZWO 7nm Sulphur II narrowband filter enhances the contrast of emission and planetary nebulae. These peculiar nebulae emit light only in specific wavelengths (H; OIII; SII) and the narrowband filters have the property to reject all light outside these bands. The passing band or "window" of these filters is 7nm wide. Considering that the visible light spectrum is between 380nm and 740nm, a 7nm filter would block 98% of the unwanted light. As a