- Exposure time: 3 hours, 40
minutes (20 min. sub-exposures)
- Lens/telescope: Takahashi FSQ-106ED (4.2")
quadruplet ED refractor at f/5
- Image scale: 2.10 arcseconds per
pixel, FOV 116.3' x 87.6' (F = 530 mm at 5.4 micron pixels)
- Camera: SBIG ST-8300M (T: -20 degrees
Celsius) with Baader
H-alpha 7 nm narrowband filter
- Mount: Astro-Physics Mach1 GTO
(guide rate: 1x, PEM activated)
- Guiding: TS OAG + SX
Lodestar +
PHD
- SQM: - (not measured)
- Location: Zoetermeer, The
Netherlands
- Date: June 3
- 2, 2011
Workflow
Image acquisition:
- Capturing 11 light frames of 1200s
Pre-processing
in
Nebulosity
(v2.3.5),
RegiStar
(1.0.7)
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 in RegiStar
- 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" filter
- Applying
Astronomy Tools v1.6 "Local Contrast Enhancement" action
Finishing
touches
in
Nebulosity
(v2.3.5):
- Sharpening image with "Tighten
Star Edges"
|
