Antlia ALP-T Dualband 3nm SII + OIII 2'' Filters

The Antlia ALP-T Dualband 3nm SII&OIII Filter is a dual narrowband filter, which lets the deep-red SII 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.

The advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, SII 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.

More information coming soon

Technical Data:

• FWHM: 3nm +0.6/-0.1nm
• Filter Thickness: 2mm+/-0.05mm
• Basic Substrate Optical, Single / Non-glued substrate
• Surface Quality S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
• Transmitted Wavefront Lambda/4 or better. Parallelism less than 30 arcsec

Filter Ring:

• 2’’ Mounted (M48*0.75 thread)
• Ultra-thin filter cell to minimize vignetting by maximizing possible clear aperture
• Black Anodized Finish
• Laser Engraving, No Fading

Not Recommended:

• Solar Observing and imaging
• Night visual observation
• DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.

Not Permitted:
DO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY
Serious eye damage will result if you fail to observe the warning.

Technical Specifications

More information coming soon

In the Box

• Antlia ALP-T Dual Band SII & OIII 3nm 2" Filter

Warranty & Manual

Antlia 3-Years Warranty against Delamination