ZWO SII 7nm NARROWBAND FILTER GEOPTIK13 Connection telescope side 60 mm

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

The GIOTTO 255 can be used with telescopes with an aperture up to 255mm and an external tube diameter between 217 - 279mm with the included plastic thumbscrews

has a 3/8" female thread

With the optional TOA-35FL field flattener

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

ZWO SII 7nm NARROWBAND FILTER GEOPTIK13 Connection telescope side 60 mmThe 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