Sergei Golyshev (AFK during workdays)
Laboratorium Solaris: Sleeping Sun
Saturdays' Sun was rather visually boring, hence the title :)
Bright rim aside - it's a deconvolution artifact - this is how the Sun looks like if observed visually through Hα interference filtering telescope.
WARNING! Sun is dangerous, use proper filters for observing and imaging!
Aquisition time: JD 2456717.886007 (01.03.2014 13:15:51 MSK).
Image orientation: inverted (west is left and North is down)
Equipment:
Canon EOS 60D (unmodded) coupled to Coronado PST via Baader Planetarium Hyperion Zoom 8-24 mm Mark III click-stop system eyepiece and Baader Planetarium M43-to-T2 conversion ring and mounted on photo-tripod.
Aperture 40 mm
Native focal length 400 mm
Projection zoom setting: 20 mm.
Effective focal length ~900 mm
Tv = 1/30 seconds
Av (effective) = NA
ISO 800
Exposures: 74 (all in :)
Processing: images were converted to monochrome and exported as 8-bit .TIFFs. Images were assembled into stack in ImageJ and saved as .AVI. AVI was processed in Autostakkert!2.
Resulting image was subjected to Richardson-Lucy deconvolution in AstraImage 3.0 (Cauchy type PSF, size 2,8 units, 10 iterations). Deconvolve image was tonmapped in Luminance HDR (QTPFSGUI) using Mantiuk'06 operator with contrast factor 0,3 and pre-gamma 0,515.
Contrast enchancement, high-pass filtering and coloration made in Photoshop.
Image was scaled down to have Solar disk equals to 1265 pixels in diameter to compensate oversampling.
Laboratorium Solaris: Sleeping Sun
Saturdays' Sun was rather visually boring, hence the title :)
Bright rim aside - it's a deconvolution artifact - this is how the Sun looks like if observed visually through Hα interference filtering telescope.
WARNING! Sun is dangerous, use proper filters for observing and imaging!
Aquisition time: JD 2456717.886007 (01.03.2014 13:15:51 MSK).
Image orientation: inverted (west is left and North is down)
Equipment:
Canon EOS 60D (unmodded) coupled to Coronado PST via Baader Planetarium Hyperion Zoom 8-24 mm Mark III click-stop system eyepiece and Baader Planetarium M43-to-T2 conversion ring and mounted on photo-tripod.
Aperture 40 mm
Native focal length 400 mm
Projection zoom setting: 20 mm.
Effective focal length ~900 mm
Tv = 1/30 seconds
Av (effective) = NA
ISO 800
Exposures: 74 (all in :)
Processing: images were converted to monochrome and exported as 8-bit .TIFFs. Images were assembled into stack in ImageJ and saved as .AVI. AVI was processed in Autostakkert!2.
Resulting image was subjected to Richardson-Lucy deconvolution in AstraImage 3.0 (Cauchy type PSF, size 2,8 units, 10 iterations). Deconvolve image was tonmapped in Luminance HDR (QTPFSGUI) using Mantiuk'06 operator with contrast factor 0,3 and pre-gamma 0,515.
Contrast enchancement, high-pass filtering and coloration made in Photoshop.
Image was scaled down to have Solar disk equals to 1265 pixels in diameter to compensate oversampling.