Astronomy Specialist

ANTLIA 3nm FAST ULTRA NARROWBAND SET Ha + OIII + SII

$1,065.00 USD
SKU: AN-3NMSHO36FAST

Antlia


Size


The Antlia 3nm FAST ultra narrowband filters boost the contrast of emission nebulae and supernova remnants for professional results, even under a bright sky affected by light pollution. The FAST series of filters are designed for telescopes with a focal ratio between f/2.6 - f/3.6.

 

 

Blueshift data indicates that at a focal ratio of f/2.6, the angle of incidence of the light cone is 10° and its bandwidth shifts 2.2nm to shorter wavelengths. Therefore, the FAST 3nm ultra narrowband filters are designed to be pre-shifted by 1.2nm towards the longer (red) end in order to compensate for this blueshift and ensure high signal with telescopes which have fast focal ratios.

Using these highspeed SHO 3nm Pro narrowband filters for telescopes with focal ratios between f/2.6 and f/3.6 shows much stronger and more contrasted images compared to the standard non-FAST filters.

For optics with f-ratios slower than f/3.6, the standard 3nm Pro filters are recommended. Meanwhile, if you use optics faster than f/2.6, the 4.5nm EDGE filters will give better signal.

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 each filter is above 90% 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.

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 90%
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 Schott monolithic optical substrate (non glued)
Filter size Mounted 2", Unmounted 36 mm

 

 

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ANTLIA 3nm FAST ULTRA NARROWBAND SET Ha + OIII + SII

From $1,065.00 USD

Size

  • 36mm
  • 2"

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

Filter size

Bandpass (FWHM)

Bandpass (FWHM)

Glass thickness

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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