Astrophotography Calculator
Star trail vs point: max exposure from focal length and declination.
Inputs
Results
Recommended exposure (sec)
10.1
500 Rule max (sec)13.9
NPF Rule max (sec)10.1
Total integration (min)5
Scene EV (ISO 100)4.64
Pixel pitch (µm)4.8
Approx. limiting magnitude9.7
SNR improvement (×)5.48
How to Use This Calculator
- Enter your focal length in mm and camera sensor pixel pitch in micrometers.
- Set the target object (Milky Way, nebula, star trails) to load recommended exposure parameters.
- Input your sky darkness rating on the Bortle scale from 1 to 9.
- Review the 500 Rule Max Exposure, Recommended ISO, and Tracking Required flag.
- Use the Image Scale in arcsec per pixel to match your setup to the desired level of detail.
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