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Clouded out again?

Process real deep‑sky data tonight. No telescope required.

AstrophotoMarket is a marketplace of stacked & calibrated master light frames (FITS) shot by astrophotographers under dark skies. Download a free 21‑hour Bortle 1 SHO dataset of the Heart Nebula, open it in PixInsight, Siril or Photoshop — and see what you can do with it.

Download the free Heart Nebula master lights Browse all datasets
Free account · No card · FITS files ready for processing
The Heart Nebula - Melotte 15 / IC 1805 FREE · 21 h · Bortle 1 IC 1805 · Hα 8.5 h · OIII 8.7 h · SII 4.1 h · TS‑130 APO + ASI294MM · Nerpio, Bortle 1
398 datasets
137 free downloads
58 astrophotographers
8 300+ hours of integration

Made for the nights you can't image

Bortle 8 backyard?

Process data captured under Bortle 1–4 skies with 3 nm narrowband filters — the kind of signal you can't get from the city.

No rig, or saving up for one?

Learn stacking‑free processing: stretch, star removal, colour calibration, narrowband palettes — on real data, not tutorials' sample JPEGs.

Six weeks of clouds?

Keep your processing skills sharp. New datasets are added every month, many with Astrobin Top Pick / IOTD credentials.

Featured tonight

Hand‑picked master lights. Green = free to download today.

View all datasets → Free datasets only
Simple process

How it works

1

Pick a dataset

Every listing shows integration time, filters, gear, Bortle class and a stretched preview.

2

Download the FITS masters

One stacked, calibrated master light per filter (Hα, OIII, SII, L, R, G, B…). Free ones cost nothing — just a free account.

3

Process it your way

PixInsight, Siril, GraXpert, Photoshop, APP — whatever you use. Post the result on r/astrophotography and credit the author.

License: personal & educational processing; commercial use per each dataset's license. Terms & Conditions

For sellers

Drives full of subs? Turn them into income.

Upload your master lights, set the price you want to receive (our commission is added on top, not taken from you) — or share them for free and build your name. You keep the copyright. We handle hosting, delivery, payments and payouts.

  • You set the price — you receive 100% of it
  • Free or paid, your choice per dataset
  • Award badges (IOTD, Top Pick, ASIWEEK) shown on your listing
  • Simple 3‑step upload form, drag & drop to our cloud drive
Start uploading How selling works
Steady supply

Want a steady stream of Bortle 1 data? Subscribe to a telescope.

Our own Sky‑Watcher Esprit 120 ED Pro (f/5.3) with an ASI2600MM Pro sits at AstroCamp, Nerpio, Spain (1670 m, Bortle 1). Subscribers get every new master light dataset it produces — minimum 4–5 per month — plus a 30‑day lookback, processing video tutorials and a private Discord.

Monthly
$45.90
/month
See subscription plans
3 months
$119.70
/3 months
See subscription plans
Save 35%
Yearly
$358.00
/year
See subscription plans

Cancel anytime.

Good to know

Frequently asked questions

What exactly is a "master light"?
A stacked, calibrated image made from all the sub‑exposures of one filter. You skip calibration and stacking and go straight to stretching, noise reduction and colour work. Delivered as 32‑bit FITS.
Is the free data really free?
Yes. Create a free account, add the dataset to your cart at $0 and download. No card, no trial.
Which software can open the files?
Anything that reads FITS: PixInsight, Siril, GraXpert, Astro Pixel Processor, DeepSkyStacker, ASTAP, Photoshop with a FITS plugin, and more.
Can I post my result online?
Absolutely — that's the point. Please credit the data author and link back; each listing shows the license.
Do you have data from my hemisphere?
Both. Northern targets from Spain/Canada/Poland and southern ones from Australia and New Zealand.
How do I sell my own data?
Register, use the 3‑step upload form, set your price. After review it goes live in the catalog and you're paid out for every sale.

Your first master light is one click away.

21 hours of narrowband on the Heart Nebula. Free. Go make something.

Download the free dataset or browse 398 datasets
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