Tutorials
Get to know the Universe.
Learn how to capture and process images.
Wide-field Night Sky Photography
Basic Deep Sky Processing Tutorial
using PixInsight
Capturing the ISS in front of the Moon
Narrowband imaging
using an H-alpha filter
Astrophotography Calculator
Excel doc for calculating exposure time, image scale, star trails and backfocus.
(You need to download the file to be able to edit it.)
Useful formulas
Image scale [arcsec/px]
= (pixel size / focal length) * 206.265
Telescope resolving power [arcsec]
= 138 / aperture (mm)
F-stop
= focal length / aperture
Magnification
= focal length (telescope) / focal length (eyepiece)
Highest useful magnification
= aperture (mm) * 2
NPF-Rule: max exposure time [sec]
= [ (35 * f-stop) + (30 * pixel pitch) ] / focal length