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Initial Android release with manual telescope optics, independent equipment profiles, transparent formulas, Free text/CSV export and JSON library backup, plus optional Lifetime Pro comparisons, original-input scenarios and custom optical factors.
Eyepiece magnification, exit pupil and approximate field of view — offline.
Calculate telescope and eyepiece optics from your own dimensions. Enter aperture, telescope focal length, eyepiece focal length and optional apparent field. See magnification, exit pupil, approximate true field of view, native focal ratio and the conventional Dawes estimate. USEFUL FROM THE START • All five base calculations in Free. • Two named telescope profiles and two named eyepiece profiles, with notes, search, edit, duplicate and delete/Undo. • Decimal millimetre or inch input, with optional apparent field when unknown. • Visible formulas and assumptions, plus light, dark and system appearance. • Text and CSV result export, sharing and JSON library backup/restore in Free. OPTIONAL LIFETIME PRO One optional, nonconsumable Google Play purchase adds more profiles without the Free profile cap, side-by-side comparison using shared or independent telescopes, custom Barlow/reducer factors, and named calculation or comparison scenarios. Saved scenarios retain their original inputs when equipment is edited or deleted. There is no subscription. Google Play shows your regional price before payment; restore purchase access with the owning Play account. YOUR EQUIPMENT, YOUR COPIES Core calculations and local records work offline. There is no PatchMedia account, advertising, equipment catalog or cloud record sync. Profiles, notes, working calculations, scenarios and settings stay in app-private storage during normal use. Google Play handles purchases and can process technical Billing diagnostics. Selected document providers and share recipients handle files you choose to send. JSON includes profiles, saved scenarios and settings, up to 10 MiB and 10,000 records per type. It excludes working calculations and purchase evidence. Restore previews the file, then replaces local records/settings and resets both working calculations after confirmation. Keep a JSON backup before uninstalling or changing devices. Purchase restoration is separate and may require a connection. Existing saved scenarios remain readable, exportable and deletable if Pro access changes. CLEAR LIMITS True field is approximate and depends on field stop and equipment. Dawes is a conventional estimate, not a guarantee of visibility or resolving performance. This manual geometry calculator does not provide sky maps, simulated views, observing or gear recommendations, imaging/exposure tools, manufacturer fitting tables or guaranteed compatibility. Privacy: https://patch-media.com/privacy/telescope-optics-calculator/ Support: contact@patch-media.com