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.
Focusing and mechanical design
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.
Imaging configuration
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.
Compatibility notes
Native 975 mm f/7.8 and removable 60 mm extension distinguished from corrected photo bundles.
Additional specifications
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
73394
Data sheet
Aperture
125 mm
Back focus
150 mm from the 2" receptacle with the M95x1 extension
Coating
Fully multi-coated
Dew shield diameter
170 mm
Focal length
975 mm
Focal ratio
f/7.8
Focuser
2.5" rack and pinion focuser
Manufacturer listed equipment
PhotoLine 125 mm apochromat M95x1 L＝60 mm extension CNC tube rings GP style dovetail bar
Manufacturer part number
TSApo125f78
Model
TS-Optics Photoline 125 OTA
Objective
Air-spaced 2-element lens - adjustable
Tube diameter
140 mm
Tube length
850 mm with retracted dew shield
Weight
7.57 kg
Specific References
MPN
TSApo125f78
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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
