TS-Optics Imaging Star 100 Quadruplet OTA This 100 mm quadruplet flat-field refractor has a 580 mm focal length and f/5.8 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Imaging Star 100 Quadruplet OTA · Specifications checked against manufacturer data on 2026-11-04
This 100 mm quadruplet flat-field refractor has a 580 mm focal length and f/5.8 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
An air-spaced triplet objective and a separate single-lens field corrector provide a 49 mm corrected, illuminated field. The 4-inch rack-and-pinion focuser has 40 mm travel and 1:10 fine adjustment.
The M82 × 1 imaging interface and tilting unit support camera setup; the focuser is rated for a 6 kg photographic load. The manufacturer lists 102 mm backfocus from the 2-inch socket and 5.3 kg tube mass.
TS-Optics manufacturer documentation
Original Imaging Star 100 hardware is documented by the manufacturer display-item page. Used/display condition and price are not assigned to the store product. 5.3 kg is retained in metric; the page’s parenthetical 10.8 lb is inconsistent and omitted.
| Field corrector | Single lens field corrector system |
|---|---|
| Corrected and fully illuminated field | 49 mm |
| Back focus from 2 connection | 102 mm - inner draw tube position |
| Drawtube travel | 40 mm |
| Clear aperture | 90 mm with anti-reflex thread |
| Connections on the eyepiece side | M82x1 male thread and 2" and 1.25" connection |
| Connections on tilter | M82x1 male/female |
| Distance from m82x1 thread to 2 connection | 33.5 mm including tilter |
| Fine focusing | 1/10 speed reduction |
| Maximum photographic load | 6 kg |
Data sheet
TS-Optics Imaging Star 100 Quadruplet OTA This 100 mm quadruplet flat-field refractor has a 580 mm focal length and f/5.8 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Imaging Star 100 Quadruplet OTA · Specifications checked against manufacturer data on 2026-11-04
