Antlia Filter ALP-T Dual Band 3.5nm SII&H-beta mounted filter 2"

Antlia Filter ALP-T Dual Band 3.5nm SII&H-beta mounted filter 2"

The ALP-T dual band 3.5nm SII&Hb filter is a dual line-pass filter, which lets the deep red Sulfur-II line and the blue Hydrogen-Beta line through and is used with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It is a significant addition to the popular Antlia ALP-T dual band 5nm Ha&OIII filter and enables false-color images and narrow-band nebula images using OSC. When capturing data with this filter, the nebulae are recorded with greater contrast against the background than without it.

The combination of these two dual band filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha/OIII/SII/Hb. The spectrum of these four channels can be separated and recombined into various colour palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O etc.

Antlia ALP-T Dual Band 3.5nm SII&Hb filter: Dual band filter with a very narrow pass band of 3.5nm 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 3nm Ha&OIII and 3.5nm 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 3.5nm allows for increasing in exposure time;

Recommended to be used with ALP-T Dual Band 3nm 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.

echnical Specifications: