Astronomy Specialist

ANTLIA TRIBAND RGB ULTRA FILTER 2"

$200.00 USD
SKU: AN-TRIBAND-2

Antlia


 

The new Antlia Triband RGB Ultra 2" filter is a broadband filter specifically designed for astrophotography with colour DSLR, CMOS or CCD cameras in areas with heavy light pollution. Three passbands in the red, green and blue allow imaging of all deep sky targets such as galaxies, star clusters and reflection nebulae.

The Triband RGB Ultra filter has a balanced colour transmission so that objects are captured accurately. The quantum efficiency of current CMOS sensors is often quite low in the blue end of the spectrum, so most broadband light pollution filters do not render a balanced image. To address this, Antlia has designed this filter to increase the luminous flux of the blue channel while retaining good OIII and H-beta transmission.

 

 

Witch Head Nebula at f/2 by Greg England | Antlia Triband filter, RASA 8", 24 x 300 seconds.

 

The Triband RGB Ultra filter can be used with telescopes as fast as f/2 with minimal band-shifting. The optical density of 4 suppresses unwanted wavelengths from light pollution, moonlight and skyglow, resulting in superior signal-to-noise ratio and better contrast. 

  • It blocks the artificial light from mercury vapour lamps, both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
  • Maximum transmission of the main nebula emission lines >92%.
  • Ideal for urban areas with extreme light pollution.
  • It incorporates an IR/UV-Cut filter that is necessary in astrophotography, especially for astronomy cameras that are sensitive to the infrared radiation.
  • Can be used as a luminance filter with monochrome cameras.
  • Ultra-thin filter cell to maximise the compatibility with most filter drawers.
  • Ideal flat-top and large bandpass reduces spectrum down shifts.
  • Good performance at focal ratios slower than f/2.

To even further enhance the contrast, and suppress the stray light and internal reflections, Antlia applies edge-blackening coating on each filter. 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.

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

 

 

Passing band RGB
Glass thickness

2.0 mm ±0.05

Optical flatness

1/4 λ (wavefront)

Transmission at H-a, S-II, O-III, NII >92%
Off-band transmission OD4 @ 300-1100 nm
Coating Double-sided multilayer nano-coating
Surface quality 60/40 (in accordance with US military watch MIL-O-13830)
Parallelism 30"
SKU
AN-TRIBAND-2


Customer Reviews

Based on 1 review
100%
(1)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
G
Greg England
Great filter

Performance of this filter on the RASA 8 is very good, as good as the Celestron branded LPF but a fraction of the cost.
I saw no gradient in the 300 sec subs taken in a bottle 4 sky looking towards Hobart.
Results look very promising and I am glad I made the decision to purchase this filter.

ANTLIA TRIBAND RGB ULTRA FILTER 2".

ANTLIA TRIBAND RGB ULTRA FILTER 2"

$200.00 USD

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

2"

Filter size

2"

Bandpass (FWHM)

Bandpass (FWHM)

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

View product