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Technical card

Imaging telescope or lens: Canon EF200mm f/2.8L II USM

Imaging camera: Canon EOS 600Da

Mount: Celestron AS-GT

Software: PixInsight

Filters: Astronomik Clip CLS CCDAstronomik Clip Ha 12nm

Accessory: Lacerta MGEN2

Resolution: 5158x3397

Dates: July 6, 2013July 7, 2013July 13, 2013July 14, 2013Aug. 4, 2013Sept. 3, 2013Sept. 4, 2013Sept. 5, 2013

Astronomik Clip CLS CCD: 101x540" ISO400
Astronomik Clip Ha 12nm: 36x720" ISO1600

Integration: 22.3 hours

Avg. Moon age: 22.08 days

Avg. Moon phase: 8.80% job: 1538000

RA center: 304.935 degrees

DEC center: 40.266 degrees

Pixel scale: 4.554 arcsec/pixel

Orientation: 136.662 degrees

Field radius: 3.907 degrees


This was my first bigger project and the first project with the CLS filter.

I didn`t dare to process it till now, because of the ungly color abberation, the green, defocused stars and terrifying halos caused by the CLS filter. And the distorted stars around the corners caused by stopping the apperture only to f4 as well.

After some years of sampling experience in the use of PixInsight i felt now ready to take the callenge of processing this hard cake.

By the overall exposuretime and the littele defocus, it was not necessary to use any denoise routine. In the opposite, i had to use a minimi of sharpening the fainter parts of the image.
Wich is a bit unusual.

In addition to correct the shape ot the stars in the corners, it was also a hard piece of work to remove the halos around the brighter stars.

All in all, iam now satified with the colorbalance, stars and nebuladetails.

Version A (Original) is the HaRGB Version.
Version B is the annotated HaRGB Version.
Version C is the Ha only Version.





Sky plot

Sky plot


IC1318 Butterfly Nebula, klausbaerbel