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Takahashi Mewlon specifications

Optical specifications

Spec. Mewlon-210 Mewlon-250 Mewlon-300
Optical design Dall-Kirkham (Cassegrain)
Effective aperture 210mm 250mm 300mm
Primary mirror diameter (focal length) 220mm (F/2,9) 260mm (F/3) 310mm (F/3)
Secondary mirror diameter (amplification) 65mm (x4) 70mm (x4) 95mm (x4)
Secondary obstruction 0,32 0,28 0,32
Standard
Focal length (at prime focus) 2415mm 3000mm 3572mm
Focal ratio (at prime focus) F/D 11,5 F/D 12 F/D 11,9
Resolution 0,55" 0,46" 0,40"
Limiting magnitude 13,4 13,8 14,2
Light grasp 900x 1275x 1836x
Image circle 18mm 21mm 25mm
Back focus 210mm 210mm 210mm
Eyepiece holder(s) 50,8mm/31,75mm 50,8mm/31,75mm 50,8mm/31,75mm
With reducer
Focal length 1961mm 2307mm 2739mm
Focal ratio F/D 9,3 F/D 9,2 F/D 9,1
Image circle 39mm 42mm 42mm
Photographic field 1,2° 45'

Mecanical specifications

Mewlon view

Mewlon exploded view
Spec. Mewlon-210 Mewlon-250 Mewlon-300
Tube length 700 mm 850 mm 1094 mm
Tube diameter 244 mm 280 mm 324 mm
Tube weight 8 kg 12 kg 26 kg