Antlia ALP-T Dual Band 5nm Ha and OIII Filter

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Antlia ALP-T Dual Band 5nm Ha and OIII Filter

£312.00✓ 2 year warranty

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36mm: £312.00
2": £398.00

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About this product

Model: antlia_alp_t_dual_5nm_36mm

Antlia ALP-T Dual Band H-alpha / Oxygen III 5nm Ultra-Narrowband Filter

For One Shot Colour CCD / CMOS / DSLR Imaging - Simultaneously Capture H-alpha and Oxygen III

The Antlia ALP-T dual band 5nm filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.

The filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution.

IMPORTANT: These filters are NOT designed for observing or photographing the Sun. DO NOT use these filters to observe or photograph the Sun. If you do it will result in permanent eye damage!

FEATURES

High transmission of H-Alpha and Oxygen III emission lines (peak transmission 90% for Ha & 82% for OIII)
FWHM: Ha 5nm, OIII 5nm
Engineered specifically for use with DSLR, CMOS, and CCD colour cameras
Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8
36mm unmounted or 2" mounted filters
36mm supplied with a B4836 filter holder enabling it to fit a 2" / M48x0.75 filter thread
2" mounted filter has an ultra-thin filter cell to minimise vignetting and maximise clear aperture
300-1100nm ≥OD4.5 blocking of unwanted wavelengths for improved signal to noise
Near IR (NIR) is blocked up to 1100nm
Extremely steep bandpass edges minimises internal reflections
Ideal flat-top and moderate bandpass reducing spectrum down shifts
Supplied in a protective plastic case with EVA foam lining
2mm+/-0.05mm glass thickness
Fine-optically polished on both sides
Ion Gun Assisted Deposition coating technology making it a highly consistent and accurate light pollution suppression filter

Transmission Chart

Blue Line - Represents the transmission curve of the filter.

The Major Emission Lines of Nebulae: H-α (656.3nm), H-β (486.1nm), OIII (495.9nm) and OIII (500.7nm)

The Major Emission Lines of Artificial Light Pollution: Hg / Mercury (435.8nm, 546.1nm, 577nm and 578.1nm), Na / Sodium (598nm, 589.6nm, 615.4nm and 616.1nm)

Sample Images

Target: IC434 – Horse Head and Flame Nebulae

- Telescope: Skywatcher 130mm F5 w/MPCC

- Mount: Losmandy G11

- Camera : IMX571 26000KPA

- Filter: Antlia ALP-T Dual Band 5nm Filter 2''

- Exposure info: 300s X 24

- Bortle scale 5

Target: NGC2244 – Rosette Nebula

- Telescope: Skywatcher 130mm F5 w/MPCC

- Mount: Losmandy G11

- Camera: IMX571 26000KPA

- Filter: Antlia ALP-T Dual Band 5nm Filter 2''

- Exposure info: 300s X 30

- Bortle scale 5

Target: Western Veil nebula

- Telescope: Skywatcher 130mm F5 w/MPCC

- Mount: Losmandy G11

- Camera: IMX571 26000KPA

- Filter: Antlia ALP-T Dual Band 5nm Filter 2''

- Exposure info: 300s X 7

- Bortle scale 5

Target: IC63 - The Phantom of Cassiopeia

- Telescope: Skywatcher 130mm F5 w/MPCC

- Mount: Losmandy G11

- Camera : IMX571 26000KPA

- Filter: Antlia ALP-T Dual Band 5nm Filter 2"

- Exposure info: 300s X 32

- Bortle scale 5

Target: Betelgeuse(Magnitude：0.5)

- Telescope: Skywatcher 130mm F5 w/MPCC

- Mount: Losmandy G11

- Camera: IMX571 26000KPA

- Filter: Antlia ALP-T Dual Band 5nm Filter 2”

Specifications

	Hydrogen-alpha	Oxygen III
FWHM	5nm	5nm
CWL (Central Wavelength)	656.3nm	500.7nm
Peak Transmission	90%	82%
Blocking	≥OD4.5 @ 300-1100nm
Filter Thickness	2mm+/-0.05mm