Antlia ALP-T Dual Band 5nm SII&H-beta Filter

- Dual band filter with a very narrow pass band of 5nm H-beta and S-II. This filter is ideal for increasing contrast of nebulae that emit in the sulfur and H-beta range using OSC. It provides additional feature separation and isolation in Hb areas.

- The advanced multi-coatings on Antlia ALP-T dual band filters effectively isolates the red, Ha line, blue-green, OIII line, deep red SII and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band 5nm Ha&OIII and SII&Hb filter creates a superior signal-to-noise ratio and better contrast in your OSC images.

The main features and application

- Passes SII 672.4nm line and H-Beta 486.1nm line;

- Engineered specifically for use with DSLR, CMOS, and CCD color cameras;

- Ultra FWHM 5nm allows for increasing in exposure time;

- Recommended to be used with ALP-T Dual Band 5nm Ha&OIII filter to create images with better signal to noise and better isolation between the 4 channels;

- Suppression of optical density (OD)4.5 on unwanted wavelengths improves signal-to-noise;

- Extremely steep bandpass and blackened edges of unmounted sizes to minimize internal reflections;

- Ideal flat-top and moderate bandpass reducing spectrum down shifts;

- Ion Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter;

- Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8;

- It can also be used as a narrowband filter for monochrome cameras to save imaging time;

- Near IR (NIR) is blocked up to 1100nm.