TS-Optics 203 mm f/12 classical Cassegrain This 203 mm classical Cassegrain combines a parabolic primary and hyperbolic secondary to give a 2436 mm focal length at f/12. The all-reflective optical train is suited to high-magnification observing and lunar/planetary imaging.
Manufacturer model: TS-Optics 203 mm f/12 classical Cassegrain · Specifications checked against manufacturer data on 2026-11-04
This 203 mm classical Cassegrain combines a parabolic primary and hyperbolic secondary to give a 2436 mm focal length at f/12. The all-reflective optical train is suited to high-magnification observing and lunar/planetary imaging.
Focusing and backfocus
A separate 2-inch dual-speed Crayford focuser adjusts the camera or eyepiece. The manufacturer specifies roughly 150 mm backfocus from the 2-inch socket and an M90 × 1 focuser connection on the tube.
Model-specific construction
The 203 mm version’s table provides its own reflectivity, secondary obstruction, tube dimensions, mass and dovetail arrangement. These values are not borrowed from the other aperture. Suitable adapters and optical extensions depend on the eyepiece or camera train.
Classical Cassegrain, not Ritchey–Chrétien or Schmidt-Cassegrain. Manufacturer’s aperture-specific reflectivity and linear-obstruction values retained.
Additional specifications
F ratio
f/12
Colimation aid
central marks on the secondary mirror for easier collimation
Suitable for infrared photography
yes
Backfokus
roughly 150 mm from the 2" receptacle
Secondary mirror obstruction
33% (linear)
Connection thread of the focuser
M90x1 on the tube
60780
Fiche technique
Diamètre
203 mm - 8"
Queue d'aronde
Vixen-GP - Skywatcher-EQ5 style, Losmandy style
Focale
2436 mm
Porte-oculaire
2" Crayford focuser with micro-gear reduction
Équipement indiqué par le fabricant
8" f/12 Cassegrain 2" focuser with reduction to 1.25" Dovetail GP style and Losmandy style Dust protection cap for the focuser and front aperture Finder shoe (mounted) M90 extension tubes German collimation manual
Référence fabricant
TSCas8M
Modèle
TS-Optics 203 mm f/12 classical Cassegrain
Optique
Cassegrain optics with parabolic primary and hyperbolic secondary mirror
Réflectivité
99% to primary and secondary mirror
Diamètre du tube
230 mm
Longueur du tube
roughly 620 mm
Poids
8.2 kg
Références spécifiques
MPN
TSCas8M
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TS-Optics 203 mm f/12 classical Cassegrain This 203 mm classical Cassegrain combines a parabolic primary and hyperbolic secondary to give a 2436 mm focal length at f/12. The all-reflective optical train is suited to high-magnification observing and lunar/planetary imaging.
Manufacturer model: TS-Optics 203 mm f/12 classical Cassegrain · Specifications checked against manufacturer data on 2026-11-04
