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250mm f/10 corrected telescope with built-in corrector, Active-Focus ASCOM compliant computer focusing, computer controlled cooling system.
This telescope is one of Takahashi’s originals and is a unique reflector designs which combines an elliptical primary mirror and a spherical secondary plus a 3-element corrector.
The M-250CRS can be used at prime focus [with a corrected field], with the dedicated reducer or extender available optionally.
Optical system ………… Corrected Dall-Kirkham
Effective aperture …… 250mm
Effective focal length 2500mm
Effective focal ratio 10.0
Secondary mirror 72mmø
Resolving power 0.46”
Limiting magnitude 13.8
Light gathering power 1275X
Image circle 40mmø
Metal Back 115.5mm
With Reducer-CR 0.73X
Effective focal length 1825mm
Effective focal ratio 7.3
Image circle 35mmø
Metal back 72.8mm
With Extender-CR 1.5X
Effective focal length 3780mm
Effective focal ratio 15.1
Image circle 44mmø
Metal back 117.5mm
Diameter of main tube 280mmø
Total length of main tube 945mm [37.2”]
Total weight of main tube 12kg [26.4 lbs] w/7x50 finder
Finder 7x50 w/apparent field of 4.2°
Hand control, control cable, 50.8mm (2”) extension tube, Allen wrenches (1.5mm, 2mm, 2.5mm & 5mm), inspection certificate & instruction manual.
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