TS-Optics Imaging Star 70 OTA This 70 mm four-element flat-field refractor has a 474 mm focal length and f/6.78 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Imaging Star 70 OTA · Specifications checked against manufacturer data on 2026-11-04
This 70 mm four-element flat-field refractor has a 474 mm focal length and f/6.78 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Focusing and mechanical design
The front objective is an FPL51/lanthanum doublet, followed by a separate two-element corrector inside the tube. The 2.5-inch RAP focuser terminates in M54 × 0.75.
Imaging configuration
The built-in corrector provides a manufacturer-specified 32 mm flat field. Working distance from the 2-inch socket is 135 mm. Tube mass including accessories is 2.8 kg; minimum length is 370 mm.
Compatibility notes
Four-element flat-field design is a two-element SD objective plus a separate built-in two-element corrector. It is not a four-element front objective. Field diameter 32 mm is manufacturer stated.
Additional specifications
Corrected and flattner field
32 mm with 100% correction
Working distance from the 2 receptacle
135 mm
Tube weight incl accessories
2.8 kg
Outer dimensions transport case
45 x 23 x 19.5 cm (LxWxH)
51024
Data sheet
Aperture
70 mm
Corrector
2-element corrector installed in the tube
Dew shield diameter
93 mm
Focal length
474 mm
Focal ratio
f/6.78
Focuser
2.5" RAP focuser with 2" reduction adapter and M54x0.75 female thread
Manufacturer listed equipment
TS 70 mm f/6.78 4-element ED Finder shoe Transport case
Manufacturer part number
TSED70Q
Model
TS-Optics Imaging Star 70 OTA
Objective
2-element SD lens with FPL51 and lanthanum special glass
Tube diameter
82 mm
Tube length
370 mm min.
Specific References
MPN
TSED70Q
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TS-Optics Imaging Star 70 OTA This 70 mm four-element flat-field refractor has a 474 mm focal length and f/6.78 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Imaging Star 70 OTA · Specifications checked against manufacturer data on 2026-11-04
