A complete guide to the astrophotography workflow: plan your observation night with free browser tools, capture FITS data with your telescope, then process and export stunning images with AstroSky Desktop.

The Complete Astrophotography Pipeline — Plan, Capture, Process

You've got a telescope, a camera, and a clear night ahead. But astrophotography is more than pointing and shooting. Professional-quality results come from a three-phase workflow, and each phase needs the right tool for the job.

Phase 1: Plan Your Night with FastTool

Before you even touch your telescope, browser-based astronomy calculators answer the questions that determine whether your session will succeed or fail.

Find Your Dark-Sky Window

The Twilight Calculator tells you exactly when astronomical twilight ends — the moment the sky becomes truly dark for deep-sky imaging. Enter your coordinates (or use auto-locate), and you get:

Civil twilight end — enough to set up equipment without a headlamp
Nautical twilight end — horizon disappears, polar alignment becomes possible
Astronomical twilight end — true darkness, your imaging window opens

At high latitudes in summer, astronomical twilight may never end — the calculator tells you before you waste a trip.

Try Twilight Calculator →

Check the Moon

A full moon washes out all but the brightest deep-sky objects. MoonSync shows you:

Current moon phase and illumination percentage
Moonrise and moonset times for your location
An interference index (0–100) telling you how much moonlight will affect your imaging

Target faint nebulae when the moon is below the horizon or during new moon. Shoot the moon itself or bright star clusters during full moon.

Check MoonSync →

Know What's in the Sky

The Sidereal Time Calculator converts UTC to Local Sidereal Time (LST), which determines what right ascension is crossing your meridian right now. This tells you:

Which targets are at their highest altitude (best seeing)
When your chosen target will transit
How to set your equatorial mount's setting circles

Calculate Sidereal Time →

Frame Your Target

The Telescope FOV Calculator helps you visualize exactly how your target will fit in the frame. Enter your:

Telescope focal length and aperture
Eyepiece or camera sensor specifications
Target object

You'll get true field of view in arcminutes, magnification, and exit pupil — critical for choosing the right equipment combination before you set up.

Plan Your FOV →

Don't Forget the Golden Hour

Solar Insight Pro gives you sunrise, sunset, and golden hour times. Landscape astrophotographers use this to plan twilight foregrounds with the Milky Way. Deep-sky imagers use sunset to time their equipment setup — you want to be polar-aligned before astronomical twilight ends.

Solar Insight Pro →

Phase 2: Capture Your Data

With the planning done, you're at the telescope. Capture your images as FITS files — the Flexible Image Transport System, the universal standard for astronomical data. Every professional observatory and space telescope (Hubble, JWST, ALMA) outputs FITS.

Why FITS?

Unlike TIFF, JPEG, or camera RAW formats, FITS is designed for science:

Multi-dimensional: A single .fits file can hold images, data cubes (3D), or time series
Metadata-rich: Headers store WCS sky coordinates, telescope specs, exposure times, filters, and observation conditions
Lossless: No compression artifacts — every photon count is preserved
Universal: Read by SAOImage DS9, AstroPy, PixInsight, Siril, and AstroSky

Save your individual exposures as separate FITS files. For multi-filter imaging (LRGB, narrowband), save each filter as its own file — you'll combine them later in processing.

Phase 3: Process with AstroSky Desktop

This is where raw data becomes art. AstroSky is a free Windows desktop application purpose-built for turning FITS files into stunning images.

Auto Smart Enhance

Drag your FITS files into AstroSky's batch importer. Click the Auto button — it analyzes the histogram shape and automatically selects:

The optimal stretch algorithm (linear, log, sqrt, or asinh)
The best color map for your data type
Black and white point clipping values

One click. No parameter hunting. This is what makes AstroSky "astronomy's Snapseed."

Choose Your Color Map

FITS images are single-channel grayscale. Color maps translate pixel intensity into visually meaningful color. AstroSky includes 12+ perceptually uniform, colorblind-friendly maps:

| Map | Best For | |-----|----------| | Viridis | General-purpose, perceptually uniform | | Inferno | Hot objects, stellar fields | | Plasma | Emission nebulae | | Magma | Dark nebulae, dust lanes | | Hubble Palette | Narrowband SHO composites | | Heat | Temperature data |

RGB Channel Synthesis

Assign separate FITS files to Red, Green, and Blue channels. Adjust stretch and black/white point independently per channel. Perfect for:

LRGB composites from monochrome cameras
Narrowband mapping (Ha → Red, OIII → Green, SII → Blue)
Multi-wavelength data from different instruments

Export Your Masterpiece

Once processing is complete, export at resolutions from 1080p to 8K. Add optional watermarks with telescope model, observation band, integration time, and your signature. Share directly to AstroBin, social media, or your personal gallery.

Learn More About AstroSky →

Quick-Start Checklist

Here's your pre-session checklist in order:

[ ] Solar Insight Pro — Note sunset time for setup window
[ ] Twilight Calculator — Find astronomical twilight end for true darkness
[ ] MoonSync — Check moon phase and interference level
[ ] Sidereal Time Calculator — Know which targets will be at transit
[ ] Telescope FOV Calculator — Verify target framing with your equipment
[ ] Capture FITS — Save exposures in the standard astronomy format
[ ] AstroSky Desktop — Auto-enhance, color-map, export at 8K

Why This Pipeline Matters

The tools in this pipeline are deliberately split between browser and desktop for a reason:

| Task | Best Platform | Why | |------|--------------|-----| | Sun position / twilight | Browser | Time-sensitive, needs real-time calculation | | Moon phase / interference | Browser | Quick look-up, no heavy data | | Sidereal time conversion | Browser | Simple arithmetic, instant result | | FOV calculation | Browser | Interactive parameter tweaking | | FITS processing & rendering | Desktop (AstroSky) | GPU-accelerated, handles 100+ megapixel files | | Multi-channel compositing | Desktop (AstroSky) | Memory-intensive, needs native performance | | 8K export with watermark | Desktop (AstroSky) | File system access, batch processing |

FastTool's browser tools and AstroSky Desktop complement each other — each does what the other can't. Together, they form a complete astrophotography pipeline that's entirely free, private, and offline-capable.