Antlia NII 3nm Pro Narrowband Filter-2'' Mounted

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Antlia NII 3nm Pro Narrowband Filter

 

The Antlia NII Pro narrowband filter optimizes the full width at half maximum (FWHM) to a 3nm bandpass. As the bandwidth narrows, these 3nm Pro narrowband filters enhance the contrast of emission targets by effectively reducing unwanted background signals. Designed to achieve an impressive 88% transmission at the 654.8nm line, Antlia NII 3nm Pro filters provide maximum signal and well-defined nebula structures. The out-of-band blocking specification is rated at OD5 (0.001%), ensuring excellent signal-to-noise ratio (SNR) and effective cutoff rates to minimize interference from other wavelengths. These improved sharp cutoff astrophotography 3nm Pro filters are specifically engineered to reduce halos around bright stars.

 

The main features and application

High transmittance and smallest bandwidth to maximize contrast

Steep spectral profile minimizes halos around bright stars

A single substrate to eliminate internal reflections   

Narrowband Objects: NII Emission Nebulae

Use in light polluted areas and dark sites

Extend imaging time when the moon is up

All Antlia narrowband Pro filters can be used down to f/3 with minimal loss of signal

All Antlia Narrowband filters unmounted are edge blackened to eliminate internal reflections from stray light

Superior optical reliability reduces post image processing

This filter is only effective for deep sky objects that contain NII emissions

 

Technical Specifications:

	NII 3nm Pro
FWHM (Full width at half maximum):	3nm
CWL (Central Wavelength)	654.8nm
Peak Transmission	88%
Blocking	> 5 OD (out of band blocking) @ 300-1100nm
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’’ (M48*0.75)

Warranty: 3-years against delamination

 

Available Size： 2’’ mounted

Retail Price: US$395.00

 

 

Spectrum Curve:

Filter Ring:

2’’ (M48*0.75)

Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture

Black Anodized Finish

Laser Engraving No Fading

 

Not Recommended:

Solar imaging

Night visual observation

 

Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY

Serious eye damage will result if you fail to observe the warning.

 

The Antlia 3nm Pro series currently comprises Ha, SII, OIII, H-Beta and NII filters that capture exceptionally narrow data from five channels, enabling a greater range of combinations in post-production to meet your diverse requirements.

It is important to note that Antlia also offers dual narrowband filters designed for OSC cameras: the ALP-T Dualband Ha&OIII 3nm/5nm and SII&Hb 3.5nm/5nm. The synergy of these two dual band filters enables the capture of exceptionally narrow-band images with OSC cameras by acquiring spectral data from four channels—Ha, OIII, SII, and Hb. The spectra from these four channels can be separated and recombined into various color palettes during post-processing. The resulting images can enhance luminance contrast in traditional RGB-balanced images or facilitate the creation of visuals in several popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, among others.