Takahashi CCA-250 Modified Cassegrain OTA 250-mm f/5.0 astrograph


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Aperture: 250mm

Back Focus: 193.9mm

Camera/Eyepiece Connection: 1.25″ Nosepiece

Corrected Image Circle: 88mm

Dawes Limit: 0.46 arcseconds

Focal Length: 1250 mm

Focal Ratio: f/5

Highest Magnification: 500x


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The CCA-250 is Takahashi’s modified Ritchey–Chrétien, developed as a replacement to the BRC-250 and is designed with imaging in mind.  The CCA-250 produces a flat field across an 88 mm image circle.  At prime focus, it is a 250-mm aperture, f/5.0 astrograph.  Coupled with a reducer, it becomes a fast f/3.6 telescope.  The CCA-250 has a carbon fiber tube and a temperature compensated lens cell to maintain focus during long exposures.  The CCA-250 also has an ASCOM compliant active focus system that enables computer control of the focusing system.

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