ZWO NARROWBAND FILTERS 31mm Ring refractors

refractors

The dew heater avoids the problem of dew condensation on the optical window of the sensor

Type Truss tube Dobsonian

By using 2 clamps you can build a side-by-side system on the same PLUS Losmandy or Vixen bar

The connections of the mount and keypad security lock screws and only one cable runs from the control box to the mount

ZWO NARROWBAND FILTERS 31mm Ring refractorsThese new 31mm narrowband filters are not mounted in a cell and they are designed to fit on the ZWO filter wheels. Narrowband filters enhance 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