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M31 with Canon 600D, 



    
        

            turfpit

M31 with Canon 600D

Technical card

Imaging telescopes or lenses:Altair Astro Lightwave 66ED-R

Imaging cameras:Canon 600D astromod

Mounts:Celestron AVX Mount

Focal reducers:Altair Planostar 0.8x

Software:Nebulosity 4.1.7SirilGIMP 2.10FITS Liberator 3.0


Dates:Nov. 11, 2018

Frames: 20x180" ISO800

Integration: 1.0 hours

Darks: ~10

Flats: ~10

Bias: ~10

Avg. Moon age: 3.70 days

Avg. Moon phase: 14.71%

Bortle Dark-Sky Scale: 6.00

Temperature: 8.00


Basic astrometry details

Astrometry.net job: 2405690


Resolution: 2352x3720

Data source: Backyard

Description

First attempt with a DSLR. The Canon has the filter removal mod from

http://www.astronomiser.co.uk/booking.htm

Several single frames with different expsoure/ISO values were captured and inspected in FITS Liberator, to check the Image Statistics were min > 0 and max < 65535. ISO 800 seemed to give a decent histogram using 18os exposure. Nebulosity used for capture.

The frames were calibrated and stacked using SiriL, output to TIFF. Final processing was with GIMP 2.10.

Dave

Comments

Author

turfpit
turfpit
License: None (All rights reserved)
1410
Like

Revisions

  • M31 with Canon 600D, 



    
        

            turfpit
    Original
  • M31 with Canon 600D, 



    
        

            turfpit
    B
  • Final
    M31 with Canon 600D, 



    
        

            turfpit
    C

B

Description: Re-processed the set, at registration in SiriL selected 'Simplified Drizzle x2'. This had the effect of increasing my file sizes from 105Mb to 420Mb. In GIMP, only curves/levels were used (no contrast, brightness, saturation, black-level). There was a slight blue imbalance which was corrected by using Levels with the blue channel. Managed to retain more stars near the core. Histogram colours fairly balanced and with an offset but still a long way to go ….. Dave

C

Description: I have been trying to improve the washed out colour on this image. Using the same stack and processing in GIMP I have created a duplicate layer (set as Luminance instead of Normal). Applied Hue/Saturation adjustments to the background layer, then flattened the image. Some colour has returned to the stars (see presence of yellow stars). Have managed to retain colour balance and offset in the histogram. Dave

Sky plot

Sky plot

Histogram

M31 with Canon 600D, 



    
        

            turfpit