Sergei Golyshev (AFK during workdays)
The Colour of Venus II: Solved!
This time the atmosphere was calmer and I have started my search for Venus earlier, that allowed me to collect 143 frames while planet was still relatively high. And before processing I have checked the brightness of colour channels. The dominant component is Red, peaking near 55000. The Green is about 40000, and Blue only reaches 29000. The same ratios were preserved after processing.
Left - just like it was shot, NR and Sharp - off; center - contrast set to "Linear"; right - processed as below.
Aquisition time (start of a session): JD 2456659.041748 (01.01.2014 17:00:07 MSK)
Image orientation: straight.
Equipment:
Canon EOS 60D (unmodded) with Vixen Deluxe 2x Barlow lens on Vixen VMC110L Klevtsov-Cassegrain telescope mounted on photo-tripod via Manfrotto 410 Junior geared head.
Aperture 110 mm
Focal length 2070 mm
Tv = 1/60 seconds
Av = f/18,8
ISO 800
Exposures: 143
Processing: contrast curve was set to linear for all images and images were converted to 16 bit clour .TIFFs, assembled into stack in ImageJ and separated into colour channels. Each channel was saved as .AVI and stacked in Autostakkert!2. Images were asembled into colour composites in ImageJ and subjected to Richardson-Lucy deconvolution in AstraImage 3.0 (Gaussian type PSF, size 2,2 units, 7 iterations).
Note: apparent size of a planet exceeded 1 minute of arc :)
The Colour of Venus II: Solved!
This time the atmosphere was calmer and I have started my search for Venus earlier, that allowed me to collect 143 frames while planet was still relatively high. And before processing I have checked the brightness of colour channels. The dominant component is Red, peaking near 55000. The Green is about 40000, and Blue only reaches 29000. The same ratios were preserved after processing.
Left - just like it was shot, NR and Sharp - off; center - contrast set to "Linear"; right - processed as below.
Aquisition time (start of a session): JD 2456659.041748 (01.01.2014 17:00:07 MSK)
Image orientation: straight.
Equipment:
Canon EOS 60D (unmodded) with Vixen Deluxe 2x Barlow lens on Vixen VMC110L Klevtsov-Cassegrain telescope mounted on photo-tripod via Manfrotto 410 Junior geared head.
Aperture 110 mm
Focal length 2070 mm
Tv = 1/60 seconds
Av = f/18,8
ISO 800
Exposures: 143
Processing: contrast curve was set to linear for all images and images were converted to 16 bit clour .TIFFs, assembled into stack in ImageJ and separated into colour channels. Each channel was saved as .AVI and stacked in Autostakkert!2. Images were asembled into colour composites in ImageJ and subjected to Richardson-Lucy deconvolution in AstraImage 3.0 (Gaussian type PSF, size 2,2 units, 7 iterations).
Note: apparent size of a planet exceeded 1 minute of arc :)