Antlia Energy Rejection Filter for Solar Observation and Photography
The filter is placed in front of the H-alpha or calcium attachment. The filter reflects the thermal radiation. When used in a refractor, the solar energy is already concentrated by the lens. We therefore recommend using the filter up to a maximum aperture of 100mm. Larger apertures should be fitted with an energy blocking filter in front of the objective.
The transmission of the filter
The ERF has two transmission ranges, H-alpha around 656.3 nm and a window around CaK (393 nm) and CaH (396.8 nm). This allows the important spectral ranges for solar observation and photography to pass through. Other bands, especially IR light, are reflected.
Scope of Delivery:
