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lefty7283, lefty7283@lemmy.world
Instance: lemmy.world
Joined: 2 years ago
Posts: 13
Comments: 11
Posts and Comments by lefty7283, lefty7283@lemmy.world
c/spaceflightmemes
lefty7283
c/mealtimevideos
c/astrophotography
c/mealtimevideos
Comments by lefty7283, lefty7283@lemmy.world
Expansion ratio with a 30ft nozzle gotta be insane
Casual ConversationWe watched Hell Comes to Frogtown for bad movie night last night. It certainly was interesting.
After a worldwide nuclear war, where 68% of the male population was wiped out and virile men becoming a rarity, Sam Hell, a scavenger and a highly virile man, is assigned to help rescue a group of fertile women kidnapped by humanoid frogs.
Siril should be able to. I’ll admit I’ve never used it myself (I use pixinsight for all my processing), but I know it’s a fairly popular free processing option. Also you’ll definitely want to try and take more dark frames than just one. Generally you’ll stack the darks together, and then subtract that from your lights (this should remove most of the noise thats not the fixed hot pixels)
That seems like a fairly typical amount to me (certainly a lot less than my old canon 600d)
Hot pixels! Best way to deal with them is taking dark frames: a bunch of exposures with the exact same settings as your light/main frames, but with the lens cap on so it just captures the noise. Also important that your camera is roughly the same temperature as when you took the light frames, since this type of noise is very temperature dependent. Once you have your dark frames, you can stack them to make a master dark, and use this to subtract the hot pixels from your lights using a deep sky stacking program of your choice.
Side note: for most consumer cameras, using a higher ISO will actually lower noise, at the cost of dynamic range
Lemmy Shitpost☝️presenting to the emergency room
Another pic from my recent dark site trip! Decided to shoot something bright and in true color LRGB. If I had stayed another night and gotten more data I probably would've pushed the image more to get more background details, but overall I like this darker look on the image. Last time I shot this nebula was in 2022 using the false color OSH palette). Captured on July 26th, 2025 from a bortle 3 zone (deerlick astronomy village).
Places where I host my other images:
Flickr | Pixelfed
TPO 6" F/4 Imaging Newtonian
Orion Sirius EQ-G
ZWO ASI1600MM-Pro
Skywatcher Quattro Coma Corrector
ZWO EFW 8x1.25"/31mm
Astronomik LRGB+CLS Filters- 31mm
Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm
Agena 50mm Deluxe Straight-Through Guide Scope
ZWO ASI-290mc for guiding
Moonlite Autofocuser
Acquisition: 4 hours 2 minutes (Camera at -15°C), half unity gain
L - 49x120"
R - 267x120"
G - 23x120"
B - 23x120"
Darks- 30
Flats- 30 per filter
Capture Software:
- Captured using N.I.N.A. and PHD2 for guiding and dithering.
PixInsight Preprocessing:
BatchPreProcessing
StarAlignment
Blink
ImageIntegration per channel
DrizzleIntegration (2x, Var β=1.5)
Dynamic Crop
DynamicBackgroundExtraction
duplicated each image and removed stars via StarXterminator. Ran DBE with a shitload of points to generate background model. model subtracted from original pic using the following PixelMath (math courtesy of /u/jimmythechicken1)
$T * med(model) / model
Luminance Linear:
Blur and noisexterminator
Stars removed with starx
ArcsinhStretch + HistogramTransformation to stretch nonlinear
RGB Linear:
ChannelCombination to combine monochrome R G and B images in to single color image
SpectrophotometricColorCalibration
BlurXterminator (correct stars only)
HSV Repair
Extracted stars with starXterminator, to be used later for independent starless processing
ArcsinhStretch + HistogramTransformation to stretch nonlinear
Slight saturation curve boost
* Stars only processing:*
ArcsinhStretch + HistogramTransformation to stretch nonlinear
Slight SCNR to remove greens
Curves to boost saturation
Nonlinear Processing:
LRGBCombination to combine stretched RGB and L images
NoiseX again (more for chrominance noise)
Several rounds of curve adjustments for lightness, contrast, saturation, color balance, with various masks
LocalHistogramEqualization (one at 16 scale for fine details, and another round at ~300 scale for larger structures)
More curves
Color Saturation
Even more curves
Slight SCNR on the background
Pixelmath to add in the stretched RGB stars only image from earlier
This basically re-linearizes the two images, adds them together, and then stretches them back to before. More info on it here)
mtf(.005,
mtf(.995,Stars)+
mtf(.995,Starless))
Resample to 80%
Tighter crop in on just the nebula
Annotation
Expansion ratio with a 30ft nozzle gotta be insane
We watched Hell Comes to Frogtown for bad movie night last night. It certainly was interesting.
What did you use to capture/process this?
ULA L
How Spiders Survive Winter is Cooler Than You Think [21:55]
Siril should be able to. I’ll admit I’ve never used it myself (I use pixinsight for all my processing), but I know it’s a fairly popular free processing option. Also you’ll definitely want to try and take more dark frames than just one. Generally you’ll stack the darks together, and then subtract that from your lights (this should remove most of the noise thats not the fixed hot pixels)
That seems like a fairly typical amount to me (certainly a lot less than my old canon 600d)
Hot pixels! Best way to deal with them is taking dark frames: a bunch of exposures with the exact same settings as your light/main frames, but with the lens cap on so it just captures the noise. Also important that your camera is roughly the same temperature as when you took the light frames, since this type of noise is very temperature dependent. Once you have your dark frames, you can stack them to make a master dark, and use this to subtract the hot pixels from your lights using a deep sky stacking program of your choice.
Side note: for most consumer cameras, using a higher ISO will actually lower noise, at the cost of dynamic range
☝️presenting to the emergency room
Another pic from my recent dark site trip! Decided to shoot something bright and in true color LRGB. If I had stayed another night and gotten more data I probably would've pushed the image more to get more background details, but overall I like this darker look on the image. Last time I shot this nebula was in 2022 using the false color OSH palette). Captured on July 26th, 2025 from a bortle 3 zone (deerlick astronomy village).
Places where I host my other images:
Flickr | Pixelfed
Equipment:
TPO 6" F/4 Imaging Newtonian
Orion Sirius EQ-G
ZWO ASI1600MM-Pro
Skywatcher Quattro Coma Corrector
ZWO EFW 8x1.25"/31mm
Astronomik LRGB+CLS Filters- 31mm
Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm
Agena 50mm Deluxe Straight-Through Guide Scope
ZWO ASI-290mc for guiding
Moonlite Autofocuser
Acquisition: 4 hours 2 minutes (Camera at -15°C), half unity gain
L - 49x120"
R - 267x120"
G - 23x120"
B - 23x120"
Darks- 30
Flats- 30 per filter
Capture Software:
PixInsight Preprocessing:
BatchPreProcessing
StarAlignment
Blink
ImageIntegration per channel
DrizzleIntegration (2x, Var β=1.5)
Dynamic Crop
DynamicBackgroundExtraction
Luminance Linear:
Blur and noisexterminator
Stars removed with starx
ArcsinhStretch + HistogramTransformation to stretch nonlinear
RGB Linear:
ChannelCombination to combine monochrome R G and B images in to single color image
SpectrophotometricColorCalibration
BlurXterminator (correct stars only)
HSV Repair
Extracted stars with starXterminator, to be used later for independent starless processing
ArcsinhStretch + HistogramTransformation to stretch nonlinear
Slight saturation curve boost
* Stars only processing:*
ArcsinhStretch + HistogramTransformation to stretch nonlinear
Slight SCNR to remove greens
Curves to boost saturation
Nonlinear Processing:
LRGBCombination to combine stretched RGB and L images
NoiseX again (more for chrominance noise)
Several rounds of curve adjustments for lightness, contrast, saturation, color balance, with various masks
LocalHistogramEqualization (one at 16 scale for fine details, and another round at ~300 scale for larger structures)
More curves
Color Saturation
Even more curves
Slight SCNR on the background
Pixelmath to add in the stretched RGB stars only image from earlier
Resample to 80%
Tighter crop in on just the nebula
Annotation
M8 - The Lagoon Nebula in LRGB
NGC 1491 - The Fossil Footprint Nebula
Sh2-173 in HSS
Sh2-170 - The Little Rosette Nebula
PSA: There is a total lunar eclipse over the Americas TONIGHT!
No eclipse glasses needed for this one!
2024 Astrophotography
32 Cygni
Sh2-132 - The Lion Nebula
The Core of the Heart Nebula