Astrophotography Calculators

Use our free online calculators to work out your best exposure times and other indicators for your gear.

Calculators & Tools

Work out your best exposure time for sharp stars with our free calculator

Use our free calculator for the 500 Rule for exposure time

Use our free focal ratio calculator to work out how fast your telescope is

Skies & Scopes is an online publication and community focused on astrophotography and amateur astronomy.

Skies & Scopes
14 Kerry Close
Fleet, Hampsire GU51 2UF
UK

Phone: +44 (0)1252 628179