Sergei Golyshev (AFK during workdays)
Anywhere Is, project SWANS, day 3: Tearing the Veil, featuring NGC 6960, 6992, 6995 and NGC 6940, open cluster
View "Original", please. Only 2048x2048 pix.
SWANS - Semi-Wide Angle Nebulae Survey
The Western part of this huge but faint bubble of ionized gas happened to be grazed by the margin of the shot made at day 2. With its 3° width it deserves a separate shot.
This is a complex object, containing several individually designated parts, and a huge portion of it is unseen by human eye.
Aquisition time: 09-10.08.2013 between 23:40 and 02:40 MSK (UTC+4)
Equipment:
Canon EF-S 60mm f/2.8 macro USM lens and Baader Planetarium 2" UHC filter mounted in front of the lens via step-down ring attached to Canon EOS 60D running Magic Lantern 2.3 firmware override riding on Vixen Polarie tracking platform over photo-tripod (alltogether codenamed "Anywhere Is, SWANS configuration").
Aperture 21,4 mm
Focal length 60 mm
Tv = 60 seconds
Av = f/2.8
ISO 2000 and 4000
Exposures: 41@ ISO2000 and 21@ISO400 (plus 15+10 dark frames and 10+10 offset frames plus 2 fake flat-field frames).
Processing: Contrast was set to "linear" for all images in Canon DPP and 16-bit outputs were fed to DSS (note for DSS users: each ISO-set was processen in separate group with only Master Flat residing in the Main Group, Maximum Enthropy image generation mode was used ).
Flat-field images were made by applying Gaussian Blur of 250 pixel radius to a randomly chosen image from the series. Once made, Master Flat works fine and removes vingetting very efficiently.
16-bit stacking result were then processed in Photoshop with Levels (namely gamma was set to 3,5) and Curves (skewed sigmoid curve was applied two times).
Note: some star-reduction technique wouldn't hurt...
Anywhere Is, project SWANS, day 3: Tearing the Veil, featuring NGC 6960, 6992, 6995 and NGC 6940, open cluster
View "Original", please. Only 2048x2048 pix.
SWANS - Semi-Wide Angle Nebulae Survey
The Western part of this huge but faint bubble of ionized gas happened to be grazed by the margin of the shot made at day 2. With its 3° width it deserves a separate shot.
This is a complex object, containing several individually designated parts, and a huge portion of it is unseen by human eye.
Aquisition time: 09-10.08.2013 between 23:40 and 02:40 MSK (UTC+4)
Equipment:
Canon EF-S 60mm f/2.8 macro USM lens and Baader Planetarium 2" UHC filter mounted in front of the lens via step-down ring attached to Canon EOS 60D running Magic Lantern 2.3 firmware override riding on Vixen Polarie tracking platform over photo-tripod (alltogether codenamed "Anywhere Is, SWANS configuration").
Aperture 21,4 mm
Focal length 60 mm
Tv = 60 seconds
Av = f/2.8
ISO 2000 and 4000
Exposures: 41@ ISO2000 and 21@ISO400 (plus 15+10 dark frames and 10+10 offset frames plus 2 fake flat-field frames).
Processing: Contrast was set to "linear" for all images in Canon DPP and 16-bit outputs were fed to DSS (note for DSS users: each ISO-set was processen in separate group with only Master Flat residing in the Main Group, Maximum Enthropy image generation mode was used ).
Flat-field images were made by applying Gaussian Blur of 250 pixel radius to a randomly chosen image from the series. Once made, Master Flat works fine and removes vingetting very efficiently.
16-bit stacking result were then processed in Photoshop with Levels (namely gamma was set to 3,5) and Curves (skewed sigmoid curve was applied two times).
Note: some star-reduction technique wouldn't hurt...