Astronomy Tools

Astronomy Tools is useful when product specifications need to become a picture. Its field-of-view calculator layers a selected eyepiece, binocular or camera-and-telescope combination over a planet or deep-sky image. Multiple setups can be added to the same frame, rotated and shared, which makes focal reducers, sensor sizes and alternative tubes much easier to compare. Other calculators address CCD sampling, magnification and related optical choices without surrounding them with a shopping catalogue.

The result is only as good as the numbers supplied. A community equipment database saves typing, but focal length, pixel size and apparent field should be checked against the manufacturer when a purchase or mosaic depends on them. Survey images also cannot predict contrast through a particular sky, filter or observer's eye. This is not a full session planner: it does not replace altitude charts, weather or target discovery. It is the quick workbench to visit after a target and equipment shortlist exist and before assuming that an object will fit.