The Antlia Dualband Solar Energy Rejection Filter is designed by combining Hydrogen Alpha, Calcium K-Line and Calcium H-Line in one dualband filter. It is the filter used in conjunction with Antlia Solar Discover 3nm CaK, 5Å CaK or similar product to protect your solar imaging equipments from high temperature and bandpass shifting by rejecting massive heat before it enters telescope when imaging and observing solar.

They are very effective at blocking UV and IR light, and allow the desired wavelengths Ha 656.3nm, CaK 393.3nm and CaH 396.8nm to pass through.

Product Features:

- FWHM 25nm with CWL at H-alpha wavelength of 656.3nm; Transmission: T＞90%

- FHWM 25nm with CWL at CaK wavelength 393.3nm covering Calcium K-Line 393.3nm 

- Warranty: 3-years