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.
Focusing and mechanical design
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.
Imaging configuration
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.
Additional specifications
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
50205
Data sheet
Aperture
100 mm
Dew shield diameter
140 mm
Focal length
580 mm
Focal ratio
f/5.8
Focuser
Dual-speed 4" CNC rack and pinion focuser with 360° rotation
Manufacturer listed equipment
100 mm f/5.8 quadruplet flatfield apochromat 4" rack-and-pinion focuser with finder shoe CNC rings
Model
TS-Optics Imaging Star 100 Quadruplet OTA
Objective
Air-spaced triplet objective
Tube
painted ultra black inside - length 490 mm (19.25") with retracted dew shield
Weight
5.3 kg (manufacturer metric value; inconsistent 10.8 lb conversion omitted)
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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
