The Filaments of the Veil
Photo description / processing
This image was captured with an OSC camera and a single Ha/OIII dual-band filter using Virtual Filter Slots (VFS), an open-source project I developed for ASIAIR and Raspberry Pi Pico.
The Ha and OIII integration times are listed separately, but every exposure recorded both bands. For each final channel, I used the exposures taken at its matching focus position.
The channels were Linear Matched before combination. Color was built with a ForaxX-style HOO palette:
R = HaG = f*Ha + (1-f)*OIIIB = OIII
withf = (Ha*OIII)^(1-Ha*OIII).
A custom dynamic luminance was used to preserve Hα detail while retaining strong OIII structures:
f = OIII*(1-Ha)L = f*OIII + (1-f)*Ha.
HDR Multiscale processing was used to enhance structural detail and control the brightest regions. Noise reduction was applied through an inverted luminance-based mask, mainly targeting low-SNR areas while protecting fine filaments. Final processing included mild star reduction, highlight control, background adjustment and saturation tuning.
Learn more about VFS:
https://kirpersidsky.github.io/rp2040-efw-hid-emulator/
Technical information
- Telescope/Lens
- Samyang 135mm f/2 ED UMC
- Camera
- ZWO ASI585MC Air
- Mount
- JUWEI 14
- Guide Scope
- on-axis guide
- Guide Camera
- ZWO ASI220MM mini
- Accessories
- Angeleyes CF-50, Svbony SV220, VFS
- Software
- Siril, Ps
- Location
- Tomsk, Россия
Light pollution
Yellow, Bortle 5 zone
- Date taken
Exposure
- 112 × 300″ · ISO/Gain: 200 · f/3.3, -10°C, Ha ·
- 56 × 300″ · ISO/Gain: 200 · f/3.3, -10°C, OIII ·
Total exposure: 14 h 0 m
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