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