Solar Discover filter with cell - opening 150 mm

Codice articolo: ANERF150

The pre-filter prevents heat from entering the tube and is necessary for H-alpha and calcium solar photography and solar observation

Free aperture is 150 mm
Suitable for 150 mm to 220 mm tube diameter
25 nm transmission in the H-alpha and calcium range - 90 % transmission
Min. 1/4 lambda accuracy - plane-parallel disks in high-quality mount
Stable attachment to the telescope via 6 metal screws with plastic tip

Antlia energy protection filters for solar observation and solar photography
The filter is placed in front of the telescope and thus prevents infrared heat radiation from penetrating the inside of the telescope. This prevents heating with all its consequences. The seeing improves dramatically and contrast filters, such as H-alpha or calcium, can also be used with larger telescopes.

The filter transmission
The ERF has two transmission ranges, on the one hand H-alpha around 656.3 nm and on the other hand a window around CaK (393 nm) and CaH (396.8 nm). This allows the important light ranges for solar observation and photography to pass through. Other areas and in particular the IR light are reflected.

Attaching to the telescope
Especially when observing the sun, it is important that the energy protection filter does not come off. That is why this filter is held in a high-quality temperature-compensated cell. The cell is fixed to the telescope with a total of six knurled screws. The screws are provided with a plastic tip to prevent scratches on the telescope.

Free aperture: 150 mm
Suitable for tubes: From 150 - 220 mm diameter
Transmission H-alpha: FWHM 25 nm - 656.3 nm
Transmission calcium: FWHM 25 nm - 393.3 nm and 396.8 nm
Max. Transmission: 90 %
Coating: Best possible coating from 200-1700 nm wavelength
Accuracy: 1/4 lambda or better