TEC300VT-7DEG survey astrograph This wide-field imaging instrument combines titanium lens cells, an Invar structure and camera-plane tilt adjustment. The original TEC datasheet documents its optical and mechanical design.
Manufacturer model: TEC300VT-7DEG · Specifications checked against manufacturer data on 2026-11-04
This wide-field imaging instrument combines titanium lens cells, an Invar structure and camera-plane tilt adjustment. The original TEC datasheet documents its optical and mechanical design.
Camera examples and calculated survey scenarios do not establish supplied equipment. Consult the original drawing for the sensor reference surface.
Original TEC manufacturer datasheet
Original TEC-authored four-page datasheet, dated 17 July 2015, preserved by Baader. Optical design credited to Valery Terebizh; mechanics and optics to Yuri Petrunin, TEC. The stated 40 kg includes an FLI camera, not a bare OTA. Published 425 mm and f/1.44 retained despite their arithmetic discrepancy. Sensor distance is measured from the final lens surface. The survey addendum is a calculated observing scenario, not guaranteed performance or supplied camera contents. Current configuration and availability are not established.
| Entrance pupil | 300 mm |
|---|---|
| Effective focal length | 425 mm |
| Published working ratio | f/1.44 |
| Image scale | 2.06 µm/arcsec |
| Spectral range | 0.42–0.84 µm |
| Angular field | 7° |
| Field shape | Flat |
| Field diameter | 52.1 mm |
| Unvignetted fraction axis edge | 0.70 / 0.57 |
| Effective aperture axis edge | 250 / 227 mm |
| Sensor distance | 70 mm from last lens surface |
| Rms spot axis edge | 2.3 / 3.8 µm |
| D80 axis edge | 5.5 / 7.1 µm |
| Distortion | Below 0.20% |
| Ghosting design statement | None reported |
| Optical length first last | 373 mm |
| Optical length first sensor | 443 mm |
| Mass with fli camera | Approximately 40 kg |
| Assembly length | 1030 mm |
| Cell material | Athermal titanium |
| Support structure | Invar rods |
| Camera tilt adjustment | 0.25° |
| Reference detectors | FLI PL16803 / PL09000 |
Data sheet
TEC300VT-7DEG survey astrograph This wide-field imaging instrument combines titanium lens cells, an Invar structure and camera-plane tilt adjustment. The original TEC datasheet documents its optical and mechanical design.
Manufacturer model: TEC300VT-7DEG · Specifications checked against manufacturer data on 2026-11-04
