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by Chris Woodhouse
The Astrophotography Manual, 2nd Edition
Cover
Title Page
Copyright Page
Table of Contents
Preface to the Second Edition
About the Author
Introduction
Astronomy Primer
The Diverse Universe of Astrophotography
Space
Catalogs
Four Dimensions and Counting
Limits of Perception
Choosing Equipment
The Ingredients of Success
New Tools
General Equipment
Imaging Equipment
A Portable System
Setting Up
Hardware Setup
Software Setup
Wireless / Remote Operation
Image Capture
Sensors and Exposure
Focusing
Autoguiding and Tracking
Pointing and Tracking Models
Sequencing, Automation and Scripting
Mosaics
Image Calibration and Processing
Post Exposure
Getting Started in PixInsight
Image Calibration and Stacking
Linear Image Processing
Non-Linear Image Processing
Narrowband Image Processing
Pix Insights
Pre-Processing
Seeing Stars
Noise Reduction and Sharpening
Image Stretching
Color Filter Array (CFA) Processing
First Light Assignments
Practical Examples
M51a/b (Whirlpool Galaxy)
M45 (Pleiades Open Cluster)
C27 (Crescent Nebula) in Narrowband
M31 (Andromeda Galaxy)
IC1805 (Heart Nebula) in False Color
Horsehead and Flame Nebula
Comet C/2014 Q2
M27 (Dumbbell Nebula)
M3 (Globular Cluster), revisited
Exoplanet and Transit Photometry
NGC1499 (California Nebula Mosaic)
NGC2264 (Cone Nebula Region)
3-D Video Imaging
IC1396A (Elephant’s Trunk Nebula)
Appendices
Diagnostics and Problem Solving
Summer Projects
Automating Observatory Control
Collimating a Ritchey Chrétien Telescope
Bibliography, Resources and Templates
Glossary and Index
Glossary
Index
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Prev
Previous Chapter
Glossary
Index
Where possible, index entries are grouped logically and indicate primary references
.
A
absolute magnitude
31
aesthetics
190
alignment
collimation
115
drift alignment
106
,
108
EQMOD
114
,
291
Paramount MX RA Scale
380
PolarAlign app
108
,
381
polar alignment
106
Polaris hour angle
113
polar scope
25
,
62
,
64
,
97
,
105
,
106
,
112
,
113
,
114
,
115
,
291
,
292
,
309
,
380
,
381
polar scope calibration
113
polar scope reticule
107
PoleMaster
101
angular formats
28
degrees, minutes and seconds
28
radians
32
angular resolution
28
CCD
35
system resolution
32
,
35
,
36
apparent visual magnitude
30
Arduino
386
artificial stars
408
ASCOM
43
,
53
,
121
,
123
,
125
,
181
,
386
ASCOM driver
387
,
394
ASCOM hubs
391
asteroids
20
astrometry (see also
plate solving
)
95
,
125
astronomical unit (AU)
29
astrophotographers
Anahory, Sam
245
Carboni, Noel
227
Dunn, Lawrence
356
Gendler, Robert
308
Legault, Thierry
15
Lunar Imaging
13
Metsävainio, J-P
226
,
356
Peach, Damian
14
,
119
atmospheric effects
34
astronomical seeing
33
light pollution
34
transparency
34
,
105
,
370
visual perception
31
atmospheric refraction
45
,
85
,
126
autoguiding
46
,
85
,
150
algorithms
163
,
164
autoguider
85
autoguider min, focal length
86
autoguider rate equation
422
autoguiding sequence
151
backlash
165
calibration
158
cameras
152
DEC compensation
126
,
162
dither
112
,
126
,
141
,
161
,
294
error threshold
166
exposure settings
156
,
163
guider optics
85
,
152
guide scope
85
,
111
guide scope alignment
117
hot pixels
154
Lodestar
84
,
152
Min and Max Movement
162
off-axis guider
53
,
84
,
152
overcorrection
373
PHD2
86
,
159
,
302
,
303
PHD2 settings
159
seeing
156
setup
160
,
166
software controls
160
ST4 interface
153
,
161
star mass setting
163
stiction
165
tracking error
154
B
Bahtinov
146
Bahtinov grabber
146
Bahtinov mask
145
Bayer array
35
,
53
,
76
,
78
,
79
,
214
,
233
Bayer Drizzle
288
Bayer, Johann
23
best-fit modeling
345
bibliography
420
binary stars
18
C
cameras (see also
sensors
)
ASCOM control
78
Canon EOS
75
Carl Zeiss lenses
98
Color Filter Array (CFA
)
285
comparisons
79
DC power supply
74
DMK (video
)
80
DSLR
285
EOS 20Da
77
EOS 60Da
77
,
351
for guiding
84
Fuji X-T1
98
,
351
Live View
75
Nkon D810A
58
one-shot color (OSC
)
79
,
233
OSC
285
planetary
119
QSI683
244
,
302
,
308
,
310
,
314
,
319
,
324
remote release adaptors
75
SLR
74
SLR dark noise performance
77
Starlight Xpress
78
,
82
,
85
,
86
,
117
,
291
,
294
,
298
,
302
,
328
,
333
,
379
,
380
Toucam webcam
81
webcam
80
Canada France Hawaii Telescope (CFHT) palette
238
catalogs
Charles Messier
17
,
19
,
23
,
24
,
81
,
420
GSC
23
,
122
Henry Draper
23
Herschel
24
John Dreyer
23
NGC
23
Patrick Caldwell Moore
24
Tycho-2
23
Cepheid variables
18
CFA
285
cloud detector
96
C-mount adaptor
85
collimation
395
alternatives
418
Cheshire sight
397
diffraction mask star-testing
414
GoldFocus
416
hall of mirrors
407
Hotech laser
406
image scale and mirror separation
417
laser
397
primary adjustments
403
process
399
star testing
410
Takahashi collimating scope
397
comets
21
ISON
21
comfort
41
communications
automatic login
129
interface box (electronics hub
)
375
interfaces
89
Microsoft remote desktop
129
serial (RS232
)
23
,
48
,
89
,
90
,
122
SkyFi
122
USB extender over Cat
5
89
,
90
,
292
USB propagation delays
378
USB speed
90
virtual COM port
122
WiFi
122
comparison star
342
computers
computing stick
103
Intel NUC
128
Laptops
91
MacBook Pro
41
netbook, limitations
91
OSX vs. Windows
91
constellations
17
coordinate systems
26
altitude
26
azimuth
27
celestial equator
28
declination
27
ecliptic
27
equatorial coordinates
26
horizontal coordinates
26
meridian
26
,
28
right ascension
27
Spring equinox
27
zenith
26
Crescent Nebula
302
critical focus zone equation
422
D
decibel
36
deconvolution
218
,
259
Deep Sky Survey (DSS)
347
de-mosaic (DeBayer)
286
dew management
47
DewBuster
72
,
377
dew-heater
47
dew-heater controller
73
,
377
dew-heater tapes
73
dew shield
47
,
73
PWM power module
377
dew-point
47
diagnostics
368
diagonal
71
diffraction limit equation
33
diffuse nebulae
18
distance ladders
29
double stars
18
DSLR_RAW
286
dust spot distance
208
E
early astronomers
8
eclipse
21
Eddington, Arthur
21
Einstein, Albert
21
,
138
electroluminescent light panel
208
,
382
electronics hub
89
,
375
Elephant’s trunk nebula
362
EQMOD
158
equinox
22
equipment choices
60
exit pupil equation
72
exoplanet
337
exoplanets
337
Differential Photometry
338
The Transit Method
337
The Wobble Method
338
exposure (see also
image capture
)
139
Binning
80
eyepieces
71
F
field of view equation
72
filters
Astrodon
81
Astronomik
81
dichroic filters
81
,
82
filter wheel
53
,
81
,
82
Hubble Palette
79
IDAS LPS-P2
76
,
99
,
347
IR filter
76
light pollution
53
RGB
79
sizes
82
finder scope
71
finding North
375
FITS
76
,
127
,
212
Flamsteed, John
23
focusing
autofocus
89
,
148
automated updates
148
Bahtinov grabber
146
Bahtinov mask
75
,
145
binning
143
Crayford focuser
64
,
87
Feather Touch focuser
89
,
291
focusing accuracy
144
FocusMax
47
,
299
GoldFocus
147
half flux density (HFD
)
144
half flux radius (HFR
)
144
Lakeside Astro
88
manual focus aids
146
mechanisms
87
MicroTouch focus
88
motor control
48
motorized focusing
88
rack and pinion
87
Rigel Systems
88
Robofocus
88
Sequence Generator Pro
148
Shoestring Astronomy
88
temperature compensation
89
,
145
V-curve
47
,
144
,
148
full width half max (FWHM)
32
,
33
,
48
,
50
,
51
,
52
,
75
,
84
,
372
,
426
G
galactic coordinates
28
galaxy types
19
GEM (see
mounts
)
64
globular cluster
17
glossary
425
GPS
26
,
43
,
49
,
50
,
89
,
97
,
108
,
291
grey scale displacement mapping
361
ground spikes
291
,
374
H
Halley, Edmond
21
Herschel, John
24
Hertzsprung-Russell diagram
16
Higgs Boson
20
hot Jupiters
337
Hubble Color Palette (HCP)
238
Hubble, Edwin
18
,
19
Hubble Space Telescope
18
,
23
,
24
,
30
,
31
,
55
,
69
,
70
,
79
,
192
,
314
,
426
hysteresis (see also
backlash, play
)
45
,
302
I
image calibration
139
,
203
bad pixel mapping
209
Bayer Drizzle
289
bias frames
204
cosmic rays
206
dark frames
204
deBayer
287
de-mosaic
286
dust
206
dust spots
208
fixing residual defect pixels
252
flat-darks
206
flat frames
205
,
207
gain normalization equation
206
image calibration
53
image examples
205
master bias and darks
250
master calibration files
205
master flats
251
Maxim DL
206
Nebulosity
207
noise improvement equation
139
overview
203
pixel rejection
257
PixInsight
208
PixInsight batch calibration
210
process diagram
204
Superbias
250
Winsorized Sigma Clipping
310
image capture
binning advantage (CCD
)
143
CMOS binning
143
combining images
37
exposure
293
exposure bookends
139
exposure judgement
141
filter sequence
293
signal makeup
142
video capture
127
image file formats
127
image integration
combining images
212
different image scales
211
image assessment
210
registration
211
stacking
209
image processing
3-D
356
32-bit manipulation
193
advanced masks
301
aesthetics
190
,
191
alternative color palettes
245
background gradient removal
215
basic activities
193
Bayer drizzle
288
CFA workflow
289
channel mixer
242
,
243
color balance
220
,
221
color contrast
316
colored star fringing
235
color management
214
color palettes
242
color saturation
228
combining L with RGB
229
combining RGB and narrowband
239
comets
326
correcting elongated stars
235
cropping
215
curve adjustments
231
DDP
224
deconvolution
217
,
218
deringing
218
Digital Development Processing (DDP
)
213
enhancing image structures
226
,
232
faint nebulosity
235
Fast Fourier Transform (FFT
)
219
generic workflow
200
HDR Toning
232
histogram stretch
225
Hα contrast enhancement
240
image repairs
234
Kernel filter
219
LAB color
228
layer blending modes
232
lighten blend mode
239
linear image workflow
213
luminance mask
216
luminance noise reduction
219
luminance sharpening
219
manipulation (definition
)
193
masked stretching
225
masking
37
,
217
narrowband
238
narrowband enhanced RGB
238
narrowband processing workflow
241
neutral background
221
noise reduction
222
,
230
,
274
,
275
non-linear workflow
224
one-shot color (OSC
)
233
Photoshop
193
,
224
,
232
Photoshop blending mode math
240
PixInsight
195
processing guidelines
193
proportional combine
240
PSF model
299
removing dark pixels
237
removing green pixels
222
selection
248
Selective Color tool (Photoshop
)
243
sharpening
224
,
231
sharpening tools
279
soft light blending mode (Photoshop
)
228
software choices
193
star quality (see also
diagnostics
)
210
star reduction and removal
225
,
317
star substitution
365
Straton
226
stretching
223
,
281
superLum
334
,
348
superRed
348
synthetic green
306
synthetic luminance
233
wavelet filter
220
images for publishing
214
imaging record
423
imaging resolution
35
inferior conjunction
22
Internet resources
421
invisible spider cabling
381
iPad
42
,
43
,
49
,
50
,
94
,
97
,
108
,
381
J
JPEG
76
Julian Dates
26
Jupiter
14
,
19
,
20
,
22
,
68
,
105
,
120
,
127
K
Kepler space telescope
337
key events in astrophotography
10
Keyspan USB to serial
48
L
leg clashes
63
Leonids (meteor shower)
20
light years
29
location
39
logbook
423
Losmandy plate
62
,
99
M
magnification equation
72
magnitude
30
main sequence
16
Mars
14
,
19
,
20
,
22
mechanical backlash / flexure
45
,
64
,
82
,
85
,
125
Melotte
15
314
meridian
26
meridian flip
63
,
112
,
125
,
126
,
149
,
211
Messier
17
,
19
,
23
,
24
,
52
,
81
,
420
meteorites
20
meteor showers
20
Microsoft Visual Studio
390
min. exposure equation
140
Model Maker (10Micron)
172
,
173
monitor calibration
214
Moore, Sir Patrick
13
,
24
mosaics
183
,
346
combination and blending
188
DNA Linear Fit
349
planning
183
planning aids
184
registration
186
star canvas
186
mounts
62
10Micron
64
,
291
AstroPhysics
64
AstroTrac
100
Avalon
64
,
103
,
166
balancing
111
belt drive systems
292
fork mount
65
Gemini
64
German equatorial
62
home position
114
,
115
imbalance and backlash
112
iOptron IEQ30
100
Losmandy
64
Meade LX200
46
,
64
meridian flip
303
Mesu
64
model comparisons
66
mount setup
105
mount specifications
66
Paramount
64
,
291
,
302
payload
44
,
66
pier extension
63
RA scale
114
shaft encoders
64
SkyWatcher NEQ6
48
,
292
,
294
slew limits
118
Takahashi
64
wedge
65
Mounts
AstroTrac
100
N
narrowband imaging
blending modes
240
Hα OIII RGB
302
LRGBHα
308
,
319
narrowband and RGB
238
narrowband imaging
241
NarrowBandRGB
240
OIII
302
SII
302
North Celestial Pole (NCP)
25
,
113
Nyquist criterion
35
,
426
O
observatory control
179
,
384
,
387
power control
394
observatory flat panel
382
open cluster
17
,
298
opposition
22
optical gain equation
30
optimum exposure equation
140
overall noise equation
138
P
Paramount polar scope
380
parsecs
29
periodic error correction
45
,
157
PECPrep
155
PEMPro
157
periodic error (PE)
150
Perseids (meteor shower)
20
photosites
35
,
76
,
137
,
138
,
139
,
143
,
425
,
427
PixInsight tools
ACDNR
295
AdaptiveContrastDrivenNoiseReduction (ACDNR
)
230
,
295
AnnotateImage
357
ATrousWaveletTransform (ATWT
)
230
,
295
,
307
AutoHistogram (AH
)
284
BackgroundNeutralization (BN
)
220
,
306
BatchPreProcessing (BPP
)
296
BatchPreprocessor (BPP
)
287
Bayer Drizzle
289
Blink
249
Catalog Star Generator
187
,
348
changing hue (curves
)
318
ChannelCombination
220
,
229
ChannelExtraction
221
,
323
CloneStamp
296
,
317
ColorCalibration
222
ColorCombine
295
ColorSaturation
243
,
244
,
295
,
307
CosmeticCorrection
209
,
237
,
253
CurvesTransformation (CT
)
223
,
228
,
244
,
284
,
296
,
307
,
313
dark scaling
335
deconvolution
306
DefectMap
253
DNA Linear Fit
187
,
349
DrizzleIntegration
211
,
289
DynamicBackgroundExtraction (DBE
)
215
,
294
,
300
,
321
DynamicPSF
217
,
306
ExtractorWaveletLayers
274
GradientMergeMosaic (GMM
)
187
,
254
,
349
HDRComposition (HDRC
)
310
,
321
HDRMultiscaleTransform (HDRMT
)
227
,
231
,
277
,
295
HistogramTransformation (HT
)
223
,
281
,
295
,
317
ImageIntegration
315
ImageSolver
186
,
357
LinearFit (LF
)
219
,
229
,
281
,
295
,
306
LocalHistogramEqualization (LHE
)
231
,
235
,
282
,
300
,
312
,
317
,
322
LRGBCombination
229
,
230
,
296
,
312
MaskedStretch (MS
)
225
,
282
,
300
,
323
master dark calculation
296
MorphologicalTransformation (MT
)
225
,
235
,
307
MultiscaleLinearTransform (MLT
)
227
,
230
,
274
MultiscaleMedianTransform (MMT
)
218
,
225
,
276
,
296
,
307
,
313
,
317
MureDenoise
273
,
320
NarrowBandRGB
240
NBRGB script
246
PixelMath
217
,
236
,
239
,
296
,
305
PixInsight desktop
197
PixInsight semantics
198
PixInsight tool descriptions
201
PixInsight user interface
196
PreviewAggregator
312
ProcessContainer
363
RangeSelection
236
removing stars
317
ScreenTransferFunction (STF
)
224
,
229
,
311
SelectiveColorNoiseReduction (SCNR
)
222
SHO-AIP script
246
,
364
StarAlignment
254
StarMask
218
,
236
,
306
structures
220
SubframeSelector
249
,
310
TGVDenoise
222
,
276
,
296
,
307
,
311
,
317
,
322
UnsharpMask
277
Warren Keller
195
wavelet transform principles
220
planetarium
19
,
20
,
23
,
24
,
48
planetary nebulae
18
planetary targeting
119
PlateSolve2
56
,
95
plate-solving (see also
astrometry
)
50
,
125
pointing models
169
astrometry
171
atmospheric refraction
173
TheSkyX
174
TPoint
169
,
170
polar drift rate equation
422
polar error equation
422
Polaris
25
,
27
,
381
polar scope
25
iOptron
101
PoleMaster
101
,
150
polar scope reticule
380
PoleMaster
102
power
48-volt DC supply module
379
batteries
40
,
41
,
74
,
75
battery life
41
,
90
,
91
DC power supply
292
power
39
,
40
,
78
,
224
,
377
,
379
,
427
powering on
110
safety checks
379
USB hubs
40
precession
25
,
28
,
107
,
113
problem solving
368
Prolific USB to serial
48
R
rain detector
389
RAW files
75
,
76
,
95
Rayleigh Criterion equation
33
RDF
71
red dot finder
71
relative humidity
72
remote control
180
shutdown and restart
129
roll-off roof
384
Rosse, Earl of
294
RS232 (see also
communications
)
23
,
48
,
90
,
122
S
safety
40
earth leakage current breaker
40
mains power
40
satellites
20
Hipparcos
29
Scagell, Robin
60
scripting
177
,
180
sensors
ADC
36
advantages of CCDs
77
binning and pixel SNR
143
bit depth
36
CCD
51
,
74
,
75
CCD alignment jig
379
CCD cooling
78
CCD interface
78
CCD parameters
78
CCD resolution equation
35
CMOS
74
,
75
dynamic range
36
,
37
,
232
full well capacity
36
Ha sensitivity
52
improving dynamic range
37
Kodak KAF8300
208
,
291
,
294
,
298
,
302
,
308
,
314
,
319
,
324
,
328
,
333
Lodestar
84
,
291
minimum exposure
139
noise
137
noise equation
140
Peltier cooler
80
pixel size
52
QSI cameras
291
read noise
37
,
139
read noise and dynamic range
36
read noise density
422
sensitivity
52
sensor noise
52
shot noise
138
size
51
,
81
Sony ICX694AL
291
thermal noise
52
,
77
sequencing and automation
177
,
384
ACP
177
CCDAutopilot
178
CCDCommander
179
MaxPilote
180
Sequence Generator Pro
179
signal to noise ratio (SNR)
37
,
141
,
143
,
156
,
239
,
240
,
311
,
371
,
372
software
43
,
48
32-bit or 64-bit OS?
122
ACP (automation
)
96
APT
146
ASCOM
49
,
91
,
123
ASCOM hubs
391
ASCOM Web
59
AstroArt
97
,
193
AstroPlanner
42
,
92
,
94
,
126
,
302
AstroTortilla plate-solve
95
autoguiding setup
126
BackyardEOS
56
BackyardNikon
56
C#
388
CCDAutoPilot (automation
)
96
CCDInspector
83
,
314
Connectify
134
control and acquisition
95
debugging and compiling
393
Elbrus (plate solving
)
95
EQMOD (EQ mount interface
)
49
,
94
Equinox Pro (OSX planetarium
)
292
FITSLiberator
126
FocusMax (autofocus
)
43
,
47
,
94
,
95
,
123
,
144
Fusion 8
357
GIMP (processing
)
193
,
223
Good Night System
96
GradientXTerminator
216
image processing
97
INDI
59
Inno Setup
393
installation
121
inter-connectivity
123
Maxim DL (acquisition and processing
)
91
,
160
,
193
,
292
MaxPoint (model making
)
292
meridian flips
125
Nebulosity (acquisition and processing
)
95
,
193
,
215
,
221
,
231
PHD2 (guiding
)
309
Photoshop
50
,
91
,
97
,
122
,
223
,
231
PinPoint (plate-solving
)
122
PixInsight (image processing
)
97
planetariums
94
plate-solving (see also
PinPoint, astrometry
)
124
Registax (video processing
)
93
,
421
Scope Nights (weather
)
34
scripting
96
Sequence Generator Pro (acquisition
)
125
setup data
124
SkySafari (planetarium
)
41
Skytools (planning
)
94
Starry Night Pro (planetarium
)
94
,
292
TeamViewer (remote control
)
90
TheSkyX (planetarium and acquisition
)
50
,
91
,
95
,
126
,
148
,
157
,
158
TPoint (model making
)
292
utilities
97
Visual Studio
390
Winclone (windows clone in OSX
)
121
X2 driver (for TheSkyX
)
91
solar system
19
solstices
22
star naming systems
17
stars (definition)
16
startup sequence
43
sequencing
293
structured problem solving (8D)
368
Suiter, Harold
395
superior planets
19
supernova
13
,
15
,
16
,
18
,
20
,
21
,
24
,
29
,
31
,
50
,
95
supernova remnants
18
supports
levelling
105
paving slabs
374
pier
65
pillar extension
44
,
119
stability
44
tripod alignment
105
tripods
44
,
65
wedge
64
system choice
61
T
T-adaptor (also T2 and T-thread adaptor)
54
,
80
telescopes (optics)
54
achromatic refractor
67
alignment
115
apochromatic refractors
31
,
54
,
66
,
67
,
83
assembly and couplings
109
astrograph
68
,
84
,
314
Barlow lens
80
Celestron
69
cleanliness
50
collimation
117
diffraction performance
34
,
35
field curvature
373
field-flattener
44
,
54
,
74
,
83
folded telescope designs
69
Harmer Wynne
70
Maksutov Cassegrain
69
,
70
Maksutov Newtonian
67
Meade
69
,
291
Newtonian
35
,
66
off-axis pickup
110
RCT
70
,
395
reducing field-flattener
83
,
308
refractors
68
Ricardi Honders
70
Ritchey Chretien
55
,
69
Schmidt Cassegrain
35
,
55
,
69
,
70
Schmidt Newtonian
67
sensor alignment
117
sensor spacing
83
,
84
system resolution
35
T2 shims
118
TIFF
76
time systems
atomic time
26
Barycentric (Heliocentric) time
26
Coordinated Universal Time
25
epoch
26
Greenwich Mean Time (GMT
)
25
J2000 (epoch
)
26
JNow (epoch
)
26
Julian Dates
26
local sidereal time (LST
)
26
local time (LT
)
25
,
27
universal time (UT
)
25
Zulu time (GMT
)
25
tonal resolution
75
tracking
bearing preload
164
DEC backlash
373
oscillation
373
periodic error
45
,
114
,
126
periodic error correction (PEC
)
157
,
158
periodic error (PE) rate of change
46
ProTrack
169
,
176
system instability
373
tracking model
169
,
176
transit curve
339
transits
22
U
USB extender over CAT5
128
USB hubs
128
,
378
,
379
V
variable stars
18
visibility
31
Visual Micro
390
Vixen plate
62
W
weather forecasting
39
,
42
,
422
OpenWeatherMap.org
57
webcam
120
X
X2
387
XISF
57
,
285
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