TS-Optics Photoline 125 OTA This 125 mm FPL53 and lanthanum air-spaced doublet has a 975 mm focal length and f/7.8 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Photoline 125 OTA · Specifications checked against manufacturer data on 2026-11-04
This 125 mm FPL53 and lanthanum air-spaced doublet has a 975 mm focal length and f/7.8 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
The 2.5-inch rack-and-pinion focuser provides an M68 × 1 female connection and 2-inch/1.25-inch sockets. CNC rings and a GP-style rail are supplied.
A 60 mm removable extension changes available backfocus from 150 to 210 mm. The 7.57 kg tube retracts to 850 mm for transport. A corrector is selected separately for imaging.
TS-Optics manufacturer documentation
New standard TSApo125f78 manufacturer page used instead of the previously linked used item. Native 975 mm f/7.8 and removable 60 mm extension distinguished from corrected photo bundles.
| Special glasses | FPL53 from Ohara (Japan) + lanthanum glass |
|---|---|
| Eyepiece side connection | M68x1 thread (female), 2" and 1.25" receptacle |
| Extended back focus | 210 mm from the 2" receptacle without the M95x1 extension |
| Connection thread at the tube | M138x1 thread (female) |
| Shipping weight | 10.5 kg |
| Shipping dimensions | 92 x 30 x 27 cm |
Data sheet
Specific References
TS-Optics Photoline 125 OTA This 125 mm FPL53 and lanthanum air-spaced doublet has a 975 mm focal length and f/7.8 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Photoline 125 OTA · Specifications checked against manufacturer data on 2026-11-04
