# Orion Nebula multiband 2x2 mosaic - HaRGBOIII

- By: Brainandforce
- Date: 2026-04-03
- Classification: Photograph
- Museum: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Orion_Nebula_multiband_2x2_mosaic_-_HaRGBOIII.jpg)
- Rights: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0)
- Picture: https://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Orion_Nebula_multiband_2x2_mosaic_-_HaRGBOIII.jpg/1920px-Orion_Nebula_multiband_2x2_mosaic_-_HaRGBOIII.jpg
- Who can see it: Kids profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

This multiband study of the Orion Nebula covered the near infrared, red, green, and blue bands along with H-alpha and \[O III\] emission. This image was assembled from the red, green, and blue data channels. H-alpha and \[O III\] emissions were then continuum subtracted from the relevant color data (red and blue in the case of H-alpha, green and blue in the case of \[O III\]), and added back linearly to increase the emission contribution.

To the naked eye, the Orion Nebula looks gray because our eyes are not sensitive to the deep red H-alpha band under dark conditions. Instead, we see the teal emission of the H-beta and O-III band combined with Rayleigh scattering of the light of the Trapezium by dust. However, taking long exposures even with a cheap camera will reveal the true color of the nebula.

Mount: Sky-Watcher Wave 150i (strain wave German equatorial mount)

Telescope: Apertura CarbonStar RC8 (Ritchey–Chrétien telescope, 203 mm aperture, 1624 mm focal length, no reducer or flattener)

Camera: Touptek ATR533M (Sony IMX533 monochrome sensor)

Filters:

Touptek 6.5 nm H-alpha (red channel) (255×60s)

Touptek R (red channel) (384×20s)

Touptek G (green channel) (384×20s)

Touptek…