astronomy.tools

astronomy.tools compares telescope, camera, eyepiece and binocular setups. The field-of-view page selects visual, imaging or binocular mode and an object, then adds equipment to the same view with an equipment key. Telescope/eyepiece focal lengths and apertures use mm, apparent field uses degrees, and camera data uses pixel counts and µm pixel dimensions. Barlow/reducer, binning and angle controls let users compare configurations. Save Image and Share FOV/full-URL controls retain the comparison. Custom DSS fields may take a few minutes to load. The site identifies the toolkit as free; nearby magnification, camera suitability and guide-scope tools answer separate setup questions.