Antlia 3 nm calcium filter for solar photography

The filter allows solar photography in the Calcium K line around 393.3 nm. In the calcium range, sunspots are imaged in a similar way to white light, but with greater contrast. Faculae, solar granulation, flares and even bright prominences at the edge of the 'solar disc' become visible to the photographer.

The filter is suitable for refractors without a built-in field corrector up to 100mm aperture. Above 100 mm aperture, or if a field corrector is built into the tube (flat field), we recommend the use of an energy protection filter in front of the lens. This will reduce heat radiation and prevent damage to the telescope or camera.

The Solar Discover is easily connected directly to the focuser via 1.25" or 2". On the camera side the filter has a 2" connection for suitable adapters.

Scope of Delivery:

• Antlia Solar Discover CaK 3 nm calcium filter with 1.25 and 2 inch connection