{
  "description": "Manufacturer-listed inputs and the geometry SkyLumi calculates from them for its smart-telescope guides. No measured performance.",
  "formulas": {
    "sensor_mm": "pixel count × pixel pitch / 1000",
    "fov_deg": "2 × atan(sensor dimension / (2 × focal length))",
    "pixel_scale_arcsec": "206264.806 × pixel pitch (µm) / 1000 / focal length (mm)",
    "clear_geometric_area_mm2": "π/4 × (aperture² − obstruction²)"
  },
  "rows": [
    {
      "id": "s50-pro",
      "name": "Seestar S50 Pro",
      "aperture_mm": 50,
      "focal_mm": 260,
      "pixel_um": 2.9,
      "nx": 3840,
      "ny": 2160,
      "array_inferred": false,
      "obstruction_mm": 0,
      "f_ratio": 5.2,
      "sensor_width_mm": 11.136,
      "sensor_height_mm": 6.264,
      "sensor_area_mm2": 69.76,
      "pixel_scale_arcsec": 2.301,
      "fov_long_deg": 2.454,
      "fov_short_deg": 1.38,
      "clear_geometric_area_mm2": 1963.5,
      "mass_kg": 2.8,
      "mass_basis": "telescope body; excludes tripod and accessories",
      "listing_amount": 899,
      "listing_currency": "USD",
      "listing_note": "Launch offer advertised to end 15 September 2026; $999 after.",
      "sources": "https://us.zwoastro.com/products/seestar-s50-pro",
      "checked_on": "2026-09-09"
    },
    {
      "id": "s30-pro",
      "name": "Seestar S30 Pro",
      "aperture_mm": 30,
      "focal_mm": 160,
      "pixel_um": 2.9,
      "nx": 3840,
      "ny": 2160,
      "array_inferred": false,
      "obstruction_mm": 0,
      "f_ratio": 5.333,
      "sensor_width_mm": 11.136,
      "sensor_height_mm": 6.264,
      "sensor_area_mm2": 69.76,
      "pixel_scale_arcsec": 3.739,
      "fov_long_deg": 3.986,
      "fov_short_deg": 2.243,
      "clear_geometric_area_mm2": 706.9,
      "mass_kg": 1.65,
      "mass_basis": "telescope body; excludes tripod and accessories",
      "listing_amount": 699,
      "listing_currency": "USD",
      "listing_note": "US listing.",
      "sources": "https://us.seestar.com/products/seestar-s30-pro https://www.zwoastro.com/product/asi585mc/",
      "checked_on": "2026-09-09"
    },
    {
      "id": "dwarf-3",
      "name": "DWARF 3",
      "aperture_mm": 35,
      "focal_mm": 150,
      "pixel_um": 2,
      "nx": 3840,
      "ny": 2160,
      "array_inferred": false,
      "obstruction_mm": 0,
      "f_ratio": 4.286,
      "sensor_width_mm": 7.68,
      "sensor_height_mm": 4.32,
      "sensor_area_mm2": 33.18,
      "pixel_scale_arcsec": 2.75,
      "fov_long_deg": 2.933,
      "fov_short_deg": 1.65,
      "clear_geometric_area_mm2": 962.1,
      "mass_kg": 1.35,
      "mass_basis": "telescope body; excludes tripod and accessories",
      "listing_amount": 549,
      "listing_currency": "USD",
      "listing_note": "US checkout listing; stock wording inconsistent on the check date.",
      "sources": "https://checkout.dwarflab.com/products/dwarf-3-smart-telescope",
      "checked_on": "2026-09-09"
    },
    {
      "id": "draco",
      "name": "DWARFLAB DRACO",
      "aperture_mm": 90,
      "focal_mm": 340,
      "pixel_um": 2.394,
      "nx": 4096,
      "ny": 3072,
      "array_inferred": true,
      "obstruction_mm": 0,
      "f_ratio": 3.778,
      "sensor_width_mm": 9.806,
      "sensor_height_mm": 7.354,
      "sensor_area_mm2": 72.12,
      "pixel_scale_arcsec": 1.452,
      "fov_long_deg": 1.652,
      "fov_short_deg": 1.239,
      "clear_geometric_area_mm2": 6361.7,
      "mass_kg": 5.5,
      "mass_basis": "telescope body; excludes tripod and accessories",
      "listing_amount": 1299,
      "listing_currency": "USD",
      "listing_note": "Standard edition launch offer advertised to end 14 September 2026; $1,399 after. SHO edition $1,499 at launch. Preorder.",
      "sources": "https://www.dwarflab.com/us/products/draco-smart-telescope https://www.dwarflab.com/us/pages/draco-smart-telescope https://www.dwarflab.com/it/pages/draco-smart-telescope",
      "checked_on": "2026-09-09"
    },
    {
      "id": "vespera-3",
      "name": "Vaonis Vespera 3",
      "aperture_mm": 50,
      "focal_mm": 245,
      "pixel_um": 2.9,
      "nx": 3840,
      "ny": 2160,
      "array_inferred": false,
      "obstruction_mm": 0,
      "f_ratio": 4.9,
      "sensor_width_mm": 11.136,
      "sensor_height_mm": 6.264,
      "sensor_area_mm2": 69.76,
      "pixel_scale_arcsec": 2.442,
      "fov_long_deg": 2.604,
      "fov_short_deg": 1.465,
      "clear_geometric_area_mm2": 1963.5,
      "mass_kg": 5,
      "mass_basis": "telescope body; excludes tripod and accessories",
      "listing_amount": 2490,
      "listing_currency": "EUR",
      "listing_note": "Euro storefront price; not converted to US dollars.",
      "sources": "https://vaonis.com/pages/vespera-new-generation https://vaonis.com/products/vespera-3",
      "checked_on": "2026-09-09"
    },
    {
      "id": "vespera-pro-2",
      "name": "Vaonis Vespera Pro 2",
      "aperture_mm": 50,
      "focal_mm": 245,
      "pixel_um": 2,
      "nx": 3536,
      "ny": 3536,
      "array_inferred": false,
      "obstruction_mm": 0,
      "f_ratio": 4.9,
      "sensor_width_mm": 7.072,
      "sensor_height_mm": 7.072,
      "sensor_area_mm2": 50.01,
      "pixel_scale_arcsec": 1.684,
      "fov_long_deg": 1.654,
      "fov_short_deg": 1.654,
      "clear_geometric_area_mm2": 1963.5,
      "mass_kg": 5,
      "mass_basis": "telescope body; excludes tripod and accessories",
      "listing_amount": 2990,
      "listing_currency": "EUR",
      "listing_note": "Euro storefront price; not converted to US dollars.",
      "sources": "https://vaonis.com/pages/vespera-new-generation https://vaonis.com/products/vespera-pro2",
      "checked_on": "2026-09-09"
    },
    {
      "id": "origin-ii",
      "name": "Celestron Origin Mark II",
      "aperture_mm": 152,
      "focal_mm": 335,
      "pixel_um": 2,
      "nx": 3856,
      "ny": 2180,
      "array_inferred": false,
      "obstruction_mm": 77,
      "f_ratio": 2.204,
      "sensor_width_mm": 7.712,
      "sensor_height_mm": 4.36,
      "sensor_area_mm2": 33.62,
      "pixel_scale_arcsec": 1.231,
      "fov_long_deg": 1.319,
      "fov_short_deg": 0.746,
      "clear_geometric_area_mm2": 13489.2,
      "mass_kg": 18.87,
      "mass_basis": "complete system including mount and tripod",
      "listing_amount": 4299,
      "listing_currency": "USD",
      "listing_note": "US listing; complete system with mount and tripod.",
      "sources": "https://www.celestron.com/products/celestron-origin-intelligent-home-observatory https://www.celestron.com/products/celestron-origin-678c-camera",
      "checked_on": "2026-09-09"
    },
    {
      "id": "s50-original",
      "name": "Seestar S50 (original)",
      "aperture_mm": 50,
      "focal_mm": 250,
      "pixel_um": 2.9,
      "nx": 1920,
      "ny": 1080,
      "array_inferred": false,
      "obstruction_mm": 0,
      "f_ratio": 5,
      "sensor_width_mm": 5.568,
      "sensor_height_mm": 3.132,
      "sensor_area_mm2": 17.44,
      "pixel_scale_arcsec": 2.393,
      "fov_long_deg": 1.276,
      "fov_short_deg": 0.718,
      "clear_geometric_area_mm2": 1963.5,
      "mass_kg": 2.5,
      "mass_basis": "telescope body; excludes tripod and accessories",
      "listing_amount": null,
      "listing_currency": null,
      "listing_note": null,
      "sources": "https://us.seestar.com/blogs/seestar-guide/seestar-s50-vs-s50-pro https://www.sony-semicon.com/files/62/flyer_security/IMX462LQR_Flyer.pdf",
      "checked_on": "2026-09-09"
    }
  ]
}