TS-Optics Photon 254 f/4 OTA This PHOTON Newtonian combines a 254 mm (10") aperture with a 1016 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 254 f/4 OTA · Specifications checked against manufacturer data on 2026-11-04
This PHOTON Newtonian combines a 254 mm (10") aperture with a 1016 mm focal length at f/4. Its parabolic primary mirror and fast optical geometry support deep-sky imaging and visual astronomy.
Optics and illumination
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.
Focusing and tube
The metal tube is fitted with a 2" monorail focuser with 1/10 dual speed, adapter to 1.25" and ring clamps. Use the published dimensions and assembled-weight configuration when selecting a mount; cameras and other added equipment contribute further load.
Imaging configuration
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.
Exact named TS manufacturer model and its published technical table checked. Unpublished dimensions, capacities and package items are not inferred.
Additional specifications
100 illuminated field of view
25 mm - ideal for APS-C format sensors with matching coma corrector
90 illuminated field of view
38 mm - therefore also suitable for larger sensors (flats make sense)
Resolving power
0.46 arcseconds
Limiting magnitude visual
14.7 mag
Weight of the tube
14.8 kg with rings and finder
Tube dimensions
length 980 mm, diameter 303 mm
58539
Datasheet
Opening
254 mm (10")
Brandpuntsafstand
1016 mm
Openingsverhouding
f/4
Focuser
2" monorail focuser with 1/10 dual speed, adapter to 1.25" and ring clamps
Door fabrikant genoemde apparatuur
TS 10" f/4 Newtonian Tube rings with GP EQ5 style dovetail bar 2" extension tube 35 mm for visual observing Dust cover for the front opening Primary mirror fan with battery holder 8x50 finder with quick release 2x insert for tube rings for metal tube
Artikelnummer fabrikant
TPM10F4
Model
TS-Optics Photon 254 f/4 OTA
Hoofdspiegel
Parabolic primary mirror with 94 % forced reflection and quartz protection layer
Vangspiegel
88 mm small axis with 94 % forced reflection and quartz protection layer
Steunvlak aan de onderkant van de buisringen
Flat support surface with an M6 thread
Steunvlak aan de bovenkant van de buisringen
Flat support surface with a 1/4? internal thread (tripod socket)
Materiaal tubus
Steel
Specifieke referenties
MPN
TPM10F4
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TS-Optics Photon 254 f/4 OTA This PHOTON Newtonian combines a 254 mm (10") aperture with a 1016 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 254 f/4 OTA · Specifications checked against manufacturer data on 2026-11-04
