TS-Optics Photon 305 f/4 OTA This PHOTON Newtonian combines a 305 mm (12") aperture with a 1220 mm focal length at f/4. Its parabolic primary mirror and fast optical geometry support deep-sky imaging and visual astronomy.
Manufacturer model: TS-Optics Photon 305 f/4 OTA · Specifications checked against manufacturer data on 2026-11-04
This PHOTON Newtonian combines a 305 mm (12") aperture with a 1220 mm focal length at f/4. Its parabolic primary mirror and fast optical geometry support deep-sky imaging and visual astronomy.
The manufacturer specifies 94% enhanced mirror reflectivity with a protective quartz layer. Secondary-mirror size and illuminated-field figures are specific to this aperture; the table distinguishes fully illuminated field from partial illumination where TS publishes both.
The metal tube is fitted with a 2" Monorail focuser with 1/10 dual speed, adapter to 1.25" and compression ring. Use the published dimensions and assembled-weight configuration when selecting a mount; cameras and other added equipment contribute further load.
A suitable coma corrector is optional for wide-field imaging. Native focuser backfocus is available mechanical travel/spacing, not automatically the sensor-spacing requirement of a chosen corrector. Keep primary and secondary collimation aligned for the installed camera train.
TS-Optics manufacturer documentation
Exact named TS manufacturer model and its published technical table checked. Unpublished dimensions, capacities and package items are not inferred.
| Aperture ratio | f/4 |
|---|---|
| 100 illuminated field | 23 mm - ideal for APS-C format sensors with suitable coma corrector |
| 90 illuminated field | 35 mm - thus also suited for larger sensors (flats helpful) |
| Limiting magnitude visual | 16.5 mag |
| Tube dimensions | Length 1170 mm, diameter 356 mm |
| Manufacturer listed equipment | TS 12 f/4 Newtonian Tube rings (dovetail is optional) 2" extension tube 35 mm for visual observing Dust cover for the front opening Primary fan with battery holder 8x50 finder with quick releaseNote: The telescope is delivered without dovetail bar; a suitable bar can be found under "Recommended accessories". |
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TS-Optics Photon 305 f/4 OTA This PHOTON Newtonian combines a 305 mm (12") aperture with a 1220 mm focal length at f/4. Its parabolic primary mirror and fast optical geometry support deep-sky imaging and visual astronomy.
Manufacturer model: TS-Optics Photon 305 f/4 OTA · Specifications checked against manufacturer data on 2026-11-04
