TS-Optics Photoline 72 FPL53 OTA This 72 mm FPL53 and lanthanum air-spaced doublet has a 432 mm focal length and f/6 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Photoline 72 FPL53 OTA · Specifications checked against manufacturer data on 2026-11-04
This 72 mm FPL53 and lanthanum air-spaced doublet has a 432 mm focal length and f/6 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Focusing and mechanical design
The 2.5-inch dual-speed RAP focuser has 80 mm travel, a 5 kg accessory rating and an M63 × 1 female imaging thread.
Imaging configuration
A matched optional 1× flattener provides full-frame correction at the native focal length. The optional 0.8× corrector gives approximately 346 mm f/4.8 for APS-C cameras; both documented configurations use 55 mm from their M48 camera thread.
Manufacturer specification note
Current manufacturer TSApo72f6 configuration: FPL53/lanthanum doublet and 2.5-inch RAP focuser.
Compatibility notes
Current manufacturer TSApo72f6 configuration: FPL53/lanthanum doublet and 2.5-inch RAP focuser.
Additional specifications
Lens design
apochromatic doublet with FPL53 and lanthanum glass element
Tube length without rings
315 mm with retracted dew shield
Thread on rear of tube
M82x1 male (connection focuser)
Dew shield type
retractable
Load capacity of the focuser
5 kg
Clamping
compression ring 2" with 3 knurled screws, 1.25" with 1 knurled screw
Working distance from the 2 receptacle
125 mm with retracted drawtube
Length of the adapter from m63 to 2
38 mm
Additional thread
M63x1 female thread for photo adaptions
Drawtube travel
80 mm
56139
Data sheet
Aperture
72 mm
Coating
fully multi-coated
Dew shield diameter
88 mm
Focal length
432 mm
Focal ratio
f/6
Focuser
2.5" rack-and-pinion, dual speed (1/10)
Manufacturer listed equipment
72 mm f/6 OTA; 2-inch to 1.25-inch visual adapter; GP-style rail with photo-tripod connection; finder shoe
Manufacturer part number
TSAPO72F6
Model
TS-Optics Photoline 72 FPL53 OTA
Tube diameter
82.5 mm
Tube material
aluminum
Tube weight
2.18 kg
Specific References
MPN
TSAPO72F6
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TS-Optics Photoline 72 FPL53 OTA This 72 mm FPL53 and lanthanum air-spaced doublet has a 432 mm focal length and f/6 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Photoline 72 FPL53 OTA · Specifications checked against manufacturer data on 2026-11-04
