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Takahashi Epsilon-180ED specifications

Optical specifications

Spec. Epsilon-180ED
Optical design Hyperbolical Newton
Effective aperture 180mm
Primary mirror diameter 190mm
Secondary mirror (minor axis) 80mm
Standard
Focal length 500mm
Focal ratio F/2.8
Resolution 0.64"
Limiting magnitude (visual) 13.0
Light grasp 661x
Image circle 44mm (60% not vignetted)
Back focus (BFL) 56mm (from the end of the corrector)
Photographic assembly M54mm female on the corrector (for wide T-mount)

Mecanical specifications

Spec. Epsilon-180ED
Tube length 570mm
Tube diameter 232mm
Tube weigth 10.7 kg