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The BRC-250 employs non-spherical surfaces for both the primary and secondary mirrors, and when they are combined with two supplementary lenses, elimates spherical aberration, coma, and even astigmatism with a flat field. It produces a focul ration of f/5 with a 100mm 5 degree diameter image circle. It also produces an amazing 2 micron stellar image at the center of the field. the BRC-250 employs the Baker method to flatten the field over a wide field. However, because its primary and secondary mirrors are hyperbolic, production was difficult. today, Takahashi's unique rechnique in polishing non-spherical surfaces enable the first mass production of Baker Richie Chretiens. The large 100mm diameter image makes the BRC-250 a versatile astrograph. The following formats cam be used: 35mm, 6x7, 6x9, and 4x5. The BRC-250 is temperature compensated by using a space age state-of-the-art carbon fiber tube which assures precise focaus that will not change with temperature fluctuations. The extremely small stellar images makes the BRC-250 the perfect instrument for CCD imaging. The 100mm diameter image circle will accomodate the largest commercially available CCD cameras.
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Terms of Sale | PRIVACY POLICY 7/1/2004 | Fine Print
Toll-Free Telephone Astronomics: 800-422-7876; Christophers, Ltd.: 800-356-6603
Alternate Telephone: 405-364-0858 24 Hour Fax Line: 405-447-3337
Telephone Hours: Monday-Friday 8 AM - 9 PM CST
Saturday Noon - 5 PM CST
Store Hours: Monday-Friday 9 AM - 5 PM CST
Saturday Noon - 5 PM CST
Astronomics / Christophers, Ltd.
680 S.W. 24th Ave.
Norman, OK, 73069
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