Antlia Solar Discover Dualband H-Alpha, CaK and CaH filter with 1.25 connection

Antlia contrast filter for solar photography

The photographic filter increases the contrast on the surface of the sun. It improves sharpness and makes details in the calcium and H-alpha range more recognizable. The filter allows light in the H-alpha range (656.3 nm), CaK range (393.3 nm) and CaH range (396.8 nm) to pass through. The increase in contrast is not as extreme as with the 3 nm CaK filter. The filter cannot be compared with the expensive H-alpha filters used to visualize prominences. The FWHM is much too large for that. It is more of a general and very good contrast filter.

The filter is suitable for refractors without a built-in image field corrector up to an aperture of 100 mm. Above 100 mm aperture or if an image field corrector is installed in the tube (flat field), we recommend using an energy protection filter in front of the objective. This reduces the entry of heat radiation and prevents damage to the telescope or camera.

The Solar Discover is simply connected directly to the focuser via 1.25" barrel. On the camera side, the filter has a 1.25" receptacle for suitable adapters and an attached T2 (M42x0.75) thread.

Safety informations: PDF Download