Astronomy Specialist

ANTLIA OIII 3nm PRO ULTRA NARROWBAND FILTER

$260.00 USD
SKU: AN-OIII3nm1.25
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Antlia

  • 3 nm


Size


The new Antlia O-III 3nm PRO ultra narrowband it is the latest filter produced by Antlia. This filter boosts the contrast of emission and planetary nebulae, Wolf-Rayet nebulae and supernova remnants for professional results, even under a bright sky affected by light pollution.

The 3.0 nm band pass is only 1% of the entire visible spectrum, increasing the signal to noise ratio and delivering high contrast images and extremely dark backgrounds. To even further enhance the contrast, and suppress the stray light and internal reflections, Antlia applies edge-blackening coating on each filter.

The maximum transmission of the Oxygen III line (500.7 nm) is above 85% within 1nm of the centre bandwidth and the transmission off band is only 0.001%. This is a value often undisclosed by other filter producers and it is critical to darken the sky background and minimise the halos around the stars.

Blue-shift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f/3 with minimal loss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.

Each filter is individually tested to ensure a high quality standard. The tight tolerance of the filters substrate assure a maximum deviance of ±0.05 from specifications making these filters parfocal.

The filter cuts off the ultraviolet and infrared light so there is no need to use the IR-cut filter.

DO NOT LOOK AT THE SUN WITH THE ANTLIA FILTERS. Serious eye damage will occur.

  

 

Passing band 3 nm (FWHM)
Glass thickness 2.0 mm ±0.05 (3.0 mm for 50 mm round & 50 x 50 mm square)
Optical flatness 1/4 λ (wavefront)
Bandpass transmission 85%
Off-band transmission OD5 @ 300-1000 nm
Coating Double-sided multilayer nano-coating
Surface quality 60/40 (in accordance with US military watch MIL-O-13830)
Parallelism <30"
Glass type Monolithic optical substrate (non glued)
Filter size Mounted 1.25", 2", Unmounted 31 mm, 36 mm, 50 mm round, 50 x 50 mm square

 

Antlia O-III 3nm PRO ultra narrow-band filter transmission curve

OIII 3nm filter transmission curve

 

Seagull Nebula by Robert Theunissen | APM LZOS 130/780, ZWO ASI2600MM Pro, Antlia 3.5nm & 3nm Ha, OIII & SII, iOptron CEM40   Seagull Nebula by Robert Theunissen | APM LZOS 130/780, ZWO ASI2600MM Pro, Antlia 3.5nm & 3nm Ha, OIII & SII, iOptron CEM40

 

Tarantula Nebula - QHY268M with Antlia 3nm Pro H-alpha & OIII filters by Caleb Kam

 

Tarantula Nebula - QHY268M with Antlia 3nm Pro H-alpha & OIII filters by Caleb Kam.

 

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Crescent Nebula (NGC 6888) taken with Antlia filters by Andrea Maggi.
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ANTLIA OIII 3nm PRO ULTRA NARROWBAND FILTER 1.25".

ANTLIA OIII 3nm PRO ULTRA NARROWBAND FILTER

From $260.00 USD

Size

  • 1.25"
  • 2"
  • 31mm
  • 36mm
  • 50mm round
  • 50 x 50mm square

Optical design

Image circle

Focal ratio

Aperture

Focal length

Optical thickness

Threads

Cooled

Colour or Mono

Pixel size

Sensor dimensions

Resolution

Sensor diagonal

Quantum efficiency

Read noise

Fullwell capacity

Bit depth

FPS

Camera backfocus

Filter size

1.25"

Filter size

1.25"

Bandpass (FWHM)

3 nm

Bandpass (FWHM)

3 nm

Glass thickness

2 mm

Mount type

Payload capacity

Latitude range

Dovetail saddle

Slew speed

Encoders

Periodic error correction

Counterweight shaft

Azimuth adjustment range

Internal diameter

Illuminated diameter

Compatible telescope external diameter

Weight

Length

Width

Height

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