ZWO OIII 7nm NARROWBAND FILTER H-Alpha The TOA-35 reducer has an

The TOA-35 reducer has an image circle of 44mm

This ZWO short adapter allows to connect your Canon EF lenses to ASI cameras with an M42 female thread and 6

detecting the pole itself as well as the fainter nearby stars

Views are generally somewhat dimmer

BA2457912 (0

ZWO OIII 7nm NARROWBAND FILTER H-Alpha The TOA-35 reducer has anThe ZWO 7nm Oxygen III 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