Antlia ALP-T Dual Band 3nm SII & OIII Filter – 2” Mounted

Description

The ALP-T dual band 3nm SII&OIII filter is a dual narrowband filter, which lets the deep red Sulfur-II 672.4nm and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR(Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and OIII emission lines signal only.

It is a significant addition to the popular Antlia ALP-T dual-band 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 high signal-to-noise ratios and greater contrast than without it.

The main features and application

Passes SII 672.4nm and OIII 500.7nm lines

Capturing of the two main emission wavebands in the deep red and blue-green at the same time

Ultra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal

Designed to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time

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

Near IR (NIR) is blocked up to 1100nm

Ideal flat-top and moderate bandpass reducing spectrum downshifts

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

Halo suppression anti-reflective