Sergei Golyshev (AFK during workdays)
Reel around the Sun, revolution III, Laboratorium Solaris: 26.08.2013, 08:38 - 08:55 MSK
The Sun was fluffy today with lots of prominences protruding all around the limb. I still can't make a full-disk shot in Hα so I concentrated on huge cloud of gas floating aloft the solar magnetic field. Since it didn't escape, it would eventually fall down on the Sun sooner or later. Maybe it would be possible to see how the prominence turns into a filament.
It is rather hard to identify the same feature in white-light and in Hα - the Sun looks too different in those lights, especially at different magnifications. Only the spots are prominent in both "channels".
Aquisition time: 26.08.2013, 08:45 MSK (UTC+4)
Image orientation: straight for all panels (North is up, East is to the left).
Equipment:
Hα: Canon EOS 60D (unmodded) coupled to Coronado PST via SpaceWeatherLive.com-style modified eye-piece projection adapter with modified 20 mm eyepiece on photo-tripod.
Aperture 40 mm
Native focal length 400 mm
Effective focal length 1995 mm
Tv = 1/13 seconds
Av (effective) = f/50
ISO 400
Exposures: 10 of 25 (image quality was set to sRAW, resulting in 2592x1728 frames with diameter of solar disk around 2050 pix)
Processing: images were converted to monochrome and pre-cropped to 717x717 pix in Canon DPP and exported as 16-bit TIFFs. Images were stacked in Registax 6 and subjected to Richardson-Lucy deconvolution in AstraImage 3.0 (Cauchy-type PSF, size 7 units, 5 iterations). Contrast enchancement and coloration (in "artisitc" way :) was made in Photoshop.
The right panel is the most succesfull single frame, deconvolved in the same way and routinely colorised. The final image was scaled down and the zone of mis-tuning was cropped away.
White-light: Canon EF 70-200 f/2.8L IS + USM lens + EF 2x III extender @200 mm with double polarization filter on EOS 60D mounted on photo tripod via Manfrotto 410 Junior geared head (codenamed "The Glimpser").
Filter: Cokin linear polarization filter @90° to Doerr circular.
Aperture 71 (40) mm
Focal length 400 mm
Av = f/10
Tv = 1/1600 sec
ISO 100
Exposures: 15 of 25
Processing: in Canon DPP the contrast of original RAW was set to "linear" and images were converted into monochrome. RAWs were converted into 16 bit TIFFs and were fed to Registax 6. Result were deconvolved (Cauchy type PSF, 1,1 units, 5 iterations) in Astra Image Pro 3. Final touches were made with Curves and assembled in Photoshop.
Reel around the Sun, revolution III, Laboratorium Solaris: 26.08.2013, 08:38 - 08:55 MSK
The Sun was fluffy today with lots of prominences protruding all around the limb. I still can't make a full-disk shot in Hα so I concentrated on huge cloud of gas floating aloft the solar magnetic field. Since it didn't escape, it would eventually fall down on the Sun sooner or later. Maybe it would be possible to see how the prominence turns into a filament.
It is rather hard to identify the same feature in white-light and in Hα - the Sun looks too different in those lights, especially at different magnifications. Only the spots are prominent in both "channels".
Aquisition time: 26.08.2013, 08:45 MSK (UTC+4)
Image orientation: straight for all panels (North is up, East is to the left).
Equipment:
Hα: Canon EOS 60D (unmodded) coupled to Coronado PST via SpaceWeatherLive.com-style modified eye-piece projection adapter with modified 20 mm eyepiece on photo-tripod.
Aperture 40 mm
Native focal length 400 mm
Effective focal length 1995 mm
Tv = 1/13 seconds
Av (effective) = f/50
ISO 400
Exposures: 10 of 25 (image quality was set to sRAW, resulting in 2592x1728 frames with diameter of solar disk around 2050 pix)
Processing: images were converted to monochrome and pre-cropped to 717x717 pix in Canon DPP and exported as 16-bit TIFFs. Images were stacked in Registax 6 and subjected to Richardson-Lucy deconvolution in AstraImage 3.0 (Cauchy-type PSF, size 7 units, 5 iterations). Contrast enchancement and coloration (in "artisitc" way :) was made in Photoshop.
The right panel is the most succesfull single frame, deconvolved in the same way and routinely colorised. The final image was scaled down and the zone of mis-tuning was cropped away.
White-light: Canon EF 70-200 f/2.8L IS + USM lens + EF 2x III extender @200 mm with double polarization filter on EOS 60D mounted on photo tripod via Manfrotto 410 Junior geared head (codenamed "The Glimpser").
Filter: Cokin linear polarization filter @90° to Doerr circular.
Aperture 71 (40) mm
Focal length 400 mm
Av = f/10
Tv = 1/1600 sec
ISO 100
Exposures: 15 of 25
Processing: in Canon DPP the contrast of original RAW was set to "linear" and images were converted into monochrome. RAWs were converted into 16 bit TIFFs and were fed to Registax 6. Result were deconvolved (Cauchy type PSF, 1,1 units, 5 iterations) in Astra Image Pro 3. Final touches were made with Curves and assembled in Photoshop.