Antlia ALP-T 2 Inch Dual Band Narrow Band Nebula Filter - 5 nm

The 2" narrow band nebula filter allows nebula photography with extreme contrast with MONO and COLOR cameras - light pollution is no longer an issue.

♦ 2" low profile filter mount with M48x0.75 thread

♦ Suitable for telescopes and lenses with a focal ratio of f/3 and slower

♦ Optical Schott base substrate

♦ Blackened edges to avoid internal reflections

♦ Extremely narrow bandwidth of only 5 nm for maximum contrast

♦ Precise transmission in H-alpha and in O-III

♦ Filter thickness 2 mm

♦ Supplied in convenient plastic transport box
 

Antlia ALP-T Dual Band 5 nm Narrow Band Nebula Filter for B/W and Color Cameras

Antlia designed this 5 nm dual line-pass filter for one-shot color cameras (OSC), DSLRs and modern system cameras. However, it can also be used as a narrow-band filter for mono cameras to save valuable shooting time and produce extremely high-contrast luminance shots, even in moonlight and near cities.

The ALP-T dual-band filter passes red H-alpha light (656.3 nm) and green O-III light (500.7 nm) and blocks all other wavelengths. In particular, the unwanted wavelengths of light pollution and airglow are blocked. This allows you to take deep deep sky images even in moonlight and from close to the city. The signal-to-noise ratio is greatly increased, allowing you to bring out even the faintest nebulae.
 

The quality features of Antlia narrow band filters at a glance:

♦ High light transmission and smallest bandwidth to maximize contrast.

♦ Steep spectral profile minimizes halos around bright stars

♦ Single substrate to eliminate internal reflections

♦ Usable in light-polluted areas and dark locations

♦ Extends exposure time in moonlight conditions

♦ Antlia narrowband Pro filters can be used with low signal loss down to F/3 systems

♦ All Antlia narrowband filters are blackened at the edges to prevent internal reflections of stray light

♦ Superior optical reliability reduces image post-processing effort

Substrate:	Schott optical substrate
Filter thickness:	2 mm
Cell:	Low-profile metal cell with M48x0.75 filter thread
FWHM:	5 nm
CWL:	656.3 nm (90%), 500.7 nm (82%)
Surface quality:	S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
Surface accuracy:	Lambda/4 or better