TS-Optics Photoline 115 ED Triplet OTA This 115 mm FPL51 and lanthanum air-spaced triplet has a 800 mm focal length and nominal f/7 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Photoline 115 ED Triplet OTA · Specifications checked against manufacturer data on 2026-11-04
This 115 mm FPL51 and lanthanum air-spaced triplet has a 800 mm focal length and nominal f/7 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
The 2.5-inch dual-speed RAP focuser rotates through 360° and provides M63/M68 threaded attachment as well as visual sockets. The tube weighs 5.9 kg.
The optional TSFLAT25Del and matched 0.8× TSREDM63-115 are documented at 55 mm from the M48 camera thread. The manufacturer’s reducer focal-length example is inconsistent with its native 800 mm table value and is not used to replace it.
TS-Optics manufacturer documentation
Manufacturer table gives 800 mm focal length, while its reducer example (644 mm at 0.8×) implies 805 mm. Native 800 mm table value retained; no derived focal length silently replaces it.
| Elements | 3 elements, air-spaced, fully coated |
|---|---|
| Glass | Triplet objective with two special glasses (FPL51 / lanthanum glass) |
| Lens edges | Blackened to prevent reflections |
| Speed settings | Reduction gear for more precise focusing |
| Weight of the optical tube | 5.9 kg |
| Connection thread on the tube for the focuser | M113x1 female thread |
| Transport length with retracted dew shield | 710 mm |
| Astrophotography | Particularly well-suited for astrophotography |
| Dew shield outer diameter for solar filters | 140 mm |
| Dew shield inner diameter | front 128 mm, rear 135 mm |
| Dovetail bar | Vixen GP style, length 200 mm - hole spacing 180 mm |
Data sheet
Specific References
TS-Optics Photoline 115 ED Triplet OTA This 115 mm FPL51 and lanthanum air-spaced triplet has a 800 mm focal length and nominal f/7 focal ratio. It is intended for visual astronomy and astrophotography with the appropriate camera train.
Manufacturer model: TS-Optics Photoline 115 ED Triplet OTA · Specifications checked against manufacturer data on 2026-11-04
