Takahashi
Takahashi BRC-250, 9.8", 1268mm f/5 Baker Ritchey-Chretien Flat Field CCD / Photo Astrographic Telescope with Lens Shade, 100mm Flat Circle.
Mfr. Part: TBK2500 SKU: TKTBK2500
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Please note! This is a Special Order Item and is Non Cancelable and Non Returnable.
We Charge you when you place your order. Approximate arrival at Adorama 1 - 2 Months from date of order. |
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7x50 6.3° Finderscope with Illuminator - Built-in Dew Shield
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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 focal ratio 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 technique 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 can 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 focus 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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| Item # | Takahashi BRC-250 |
| Optical System | Baker Ritchey-Chretien |
| Aperture | Ø250mm Hyperbolic [Enhanced coatings] |
| Corrector Assembly | 2 elements [fully multi-coated] |
| Focal Length | 1268mm [effective] |
| Focal Ratio | F/5.0 |
| Light Grasp | 1276x |
| Resolution | 0.47" |
| Limiting Magnitude | 13.8 |
| Image Circle | Ø100mm/ 5° |
| Stellar Images | Less then 10 microns at the edge and 2 microns at the center |
| Tube Diameter | Ø280mm [11.02in.] |
| Tube Length | 850mm [with dew shield] |
| Weight | 15.6kg [34.3lbs.] |
| Finder Scope | 7x50 6.3° with illuminator
11x70 4.2° optional |
| Main Tube Material | Carbon Fiber |
| Film Formats Usable | 35mm, 6x7, 6x9 and 4x5 |
| Note | Specs for the BRC-250 Tube Assembly Only |
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