OTA shelf & seeded tubes
Log aperture, focal length, f-ratio, central obstruction, and mount style—or duplicate any of 12 starters from 8" f/6 Dobs to 80mm APOs and short-tube rich-fields.
TrueField Scope Desk
TrueField Scope Desk
Lock the tube, stock the drawer, and watch true field of view snap to real Messier and solar-system sizes—then print the session card before you pack the car.
Session desk support
Illustrative marketing figures; not App Store metrics.
Optical-train planning for Dobsonian and SCT owners who are done guessing at the mount.
TrueField Scope Desk is the optical-train planning studio for Dobsonian and SCT owners who are done guessing at the mount. Build a personal OTA shelf from aperture, focal length, ratio, and obstruction—or start from seeded tubes. Fill an eyepiece drawer with Plössls, orthos, and wide-fields. The live bench recalculates magnification, true FOV, exit pupil, and resolution references as you stack Barlows or reducers. Overlay seeded targets on a circular field-stop canvas, compare two eyepieces side-by-side, and export a gram-clear multi-page PDF field card so every night’s glass choice is intentional geometry, not last-minute improvisation.
Log aperture, focal length, f-ratio, central obstruction, and mount style—or duplicate any of 12 starters from 8" f/6 Dobs to 80mm APOs and short-tube rich-fields.
Stock focal length, AFOV, barrel, and eye relief. Magnification, true FOV, exit pupil, max useful mag, and Dawes/Rayleigh figures update the instant numbers change.
Drop ×2, ×2.5, ×3, 0.8×, or 0.63× onto the active train. Effective focal length badges and before/after FOV rings show the full path at a glance.
Tap solar-system disks or Messier DSOs to overlay margin rings on a pinch-zoom theater—see whether glass frames, clips, or swims around the object.
Compare two pieces on the same OTA with paired FOV circles, exit-pupil bars, mag delta, and a one-tap framing winner for the locked target.
Lock one OTA, 3–5 eyepieces, ordered targets, and setup notes; export a multi-page PDF via PDFKit to Files or the share sheet for clipboard use under the stars.
