- Exposure time: 3 hours, 45
minutes (15 min. sub-exposures)
- Lens/telescope: Takahashi FSQ-106ED (4.2")
quadruplet ED refractor at f/3.6
- Image scale: 2.89 arcseconds per
pixel, FOV 160.2' x 120.6' (F = 385 mm at 5.4 micron pixels)
- Camera: SBIG ST-8300M (T: -15 degrees
Celsius) with Baader
H-alpha 7 nm narrowband filter
- Mount: Astro-Physics Mach1 GTO
(guide rate: 1x, PEM activated)
- Guiding: Vixen 70/400 mm + SX
Lodestar +
PHD
- SQM: - (not measured)
- Location: Zoetermeer, The
Netherlands
- Date: April 9
- 10, 2011
Workflow
Image acquisition:
- Capturing 15 light frames of 900s
Pre-processing
in
Nebulosity
(v2.3.5)
and Sigma
Beta
10:
- Pre-processing the light frames
with
a master bias frame (from
library) in Nebulosity
- Aligning (registering) the
pre-processed light frames and saving
each individual file
- Stacking
the individually saved registered files with "Standard Deviation
Masking" algorithm in Sigma
Beta 10
- Trimming the dark edges by making
a crop in
Nebulosity
- Applying the "Digital Development
Processing (DDP)" tool
Post-processing
in
Photoshop
(CS4):
- Adjusting levels and curves in
order to get a smooth and proper histogram and as much dynamic range
as possible without clipping
- Applying
"GradientXTerminator" and
"Noise Ninja" filters
- Applying
Astronomy Tools v1.6 "Local Contrast Enhancement" action
Finishing
touches
in
Nebulosity
(v2.3.5):
- Sharpening image with "Tighten
Star Edges"
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