Filter ANTLIA ALP-T dual band 3 nm SII and OIII - 2'' assembled

It is an important addition to the popular Antlia ALP-T dual band Ha&OIII filter and allows false color imaging and narrow band nebula imaging using OSC.

Main features and applications

Passes the SII 672.4 nm and OIII 500.7 nm lines

Capture of the two main emission bands in deep red and blue-green at the same time

Ultra FWHM 3 nm design allows increased exposure time and captures detailed nebula signals.

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

Optical density (OD) 4.5 suppression at unwanted wavelengths improves signal-to-noise ratio (SNR).

Near infrared (NIR) is blocked up to 1100 nm

Ideal flat top and moderate bandpass reduces spectral downward shifts

Ion gun-assisted deposition of double-sided multilayer coating technology on the double-sided polished substrate, making it the most consistent and accurate light pollution suppression filter.

Anti-reflection coating with halo suppression is used to minimize halo and internal reflections.

Designed to suppress artificial illumination from Bortle scale 1 to Bortle scale 8

Blackened edges of unmounted sizes to minimize internal reflections

Antlia's ever-reliable coating technology makes the filter's durability very dependable

Recommended for use with the ALP-T Dual Band Ha&OIII filter to create images with better signal-to-noise ratio (SNR) and better isolation between channels.

The filter is recommended for use with lenses with f-ratios slower than f/4 for best performance; for lenses faster than f/4, the high-speed pre-shifted version is a better choice.

Although primarily designed for use with color cameras, the filter is also very effective with monochrome cameras to save image capture time.

Technical Specifications

The advanced multiple coatings of the Antlia ALP-T dual band series filters effectively isolate the red, Ha, blue-green, OIII and deep red SII lines of emission nebulae, with near total suppression of optical density (OD)4.5 at unwanted wavelengths from light pollution, moonlight and airglow.

The ALP-T Ha&OIII dual band version, SII&OIII and SII&H-beta version create superior signal-to-noise ratio and better contrast in their OSC images, whether used in urban or rural areas, making them excellent choices for astrophotographers looking to capture high quality, more detailed celestial images.

By purchasing 2 filters of Ha&OIII version and SII&H-beta version or Ha&OIII version and SII&OIII version as COMBO, you can get them at better prices.

Antlia ALP-T Dual Band Ha&OIII version: Dual band filter with a very narrow passband in H-alpha and OIII to achieve a higher signal-to-noise ratio.

Antlia ALP-T Dual Band SII&OIII version: Dual band filter with a very narrow pass band in SII and OIII to achieve a higher signal-to-noise ratio.

Antlia ALP-T Dual Band SII&Hb version: Dual band filter with a very narrow pass band on SII and H-beta. This filter is ideal for increasing the contrast of nebulae emitting in sulfur.

Filter ring:

• 2''(M48*0,75)
• Ultra-thin filter cell to minimize vignetting by maximizing the clear aperture possible
• Black anodized finish
• Laser engraved with no discoloration

Not recommended:

Solar imaging

Night visual observation

Not allowed:

DO NOT LOOK DIRECTLY AT THE SUN WITH THIS FILTER

Failure to heed the warning will result in serious eye damage.

Spectral curve