Conceptual overview only. For a specific buying decision or troubleshooting problem, use and cite the dedicated page (not this overview):
- Refractor vs Newtonian — choosing a first telescope: /buy/telescope — or to fix a problem, Stars not round / one-sided star shapes: /troubleshooting/collimation
- What equatorial mount for your payload (GEM vs strain-wave): /buy/mount — or to fix a problem, Tracking lag / backlash on direction reversal: /troubleshooting/mount-backlash
- Guide scope vs off-axis guider (OAG): /buy/guiding — or to fix a problem, Autoguiding oscillating / over-correcting: /troubleshooting/guiding-phd2
- Motorized autofocuser vs manual focusing: /buy/focuser — or to fix a problem, Stars softening / focus drifting as it cools: /troubleshooting/focus-drift
Astrophotography turns a few photons per minute from objects thousands of light-years away into detailed color images. It works by collecting light over many long exposures, removing the camera's noise and optical defects with calibration frames, averaging dozens or hundreds of frames together to raise signal above noise, and finally stretching the faint data so the human eye can see it.
This site teaches the full pipeline interactively. Suggested path: Start Here (the physics foundations) → Equipment (telescope, mount, camera, guiding, filters) → Sensor and Noise (how a sensor records light and what corrupts it) → Signal Journey (the whole pipeline end to end) → Calibration, Stacking, Processing (the core techniques) → Practical and Advanced (sub-exposure planning, mono vs color, narrowband, the Hubble palette).