This newest flat field astrograph is designed to produce a flat 90Ø image circle for medium format photography or CCD imagery. This image circle can be used with the largest available CCD cameras for many years to come. The f/7.8 focal ratio enables the imager to produce images of smaller objects with amazing sharpness and contrast.
Takahashi FRC-300 - 300mm f/7.8 Baker Ritchey Chretien Astrograph
The pin-point stars 10 microns at the edge and 2348mm focal length produce a field, free of astigmatism or coma, will allow the FRC to resolve star clusters and fine detail in galaxies and nebulae across the entire 90mmØ circle. The temperature compensated secondary holder insures pinpoint stars during long exposures. The dedicated f/5.9 reducer (available separately) produces a 36mmØ flat circle for CCD imaging at this shorter focal length. Price includes built-in temperature compensation device and tube holder.
Takahashi FRC-300 - 300mm f/7.8 Baker Ritchey Chretien Astrograph Features
- Corrected Flat-Field Ritchey-Chretien Optical System is perfect for CCD or medium-format astrophotography.
- The 11.8" (300mm) diameter primary and 4.9" (125mm) secondary combine at an effective focal length of 92.4" (2348mm) to provide a f/7.8 focal ratio, yielding a 11.8" (90mm) image circle.
- With optional reducer the focal length becomes 69.7" (1770mm) and the focal ratio is f/5.9 - yielding a 1.4" (36mm) image circle.
- The tube diameter is 12.8" (324mm) and the length is 40.6" (1030mm) at a total of 66 lbs. (30kg).
- Included is a 7X50, 6.3º Finderscope.
Image shows FRC-300 OTA with an equatorial mount and pier, which is sold separately.
- Additional Information
SKU TK-TRC0300 Manufacturer Takahashi Telescope Series Takahashi BRC/ FRC Optical Design Ritchey-Chretien Mount Type None - Optical Tube Only Warranty 5 Year Warranty Telescope Aperture 11.8" Secondary Aperture 125mm Telescope Focal Length 2348mm Telescope Focal Ratio f/7.8 Back Distance Not supplied by manufacturer Image Circle 90mm Image Across Field Not supplied by manufacturer Optical Coatings Fully Multi-Coated Limiting Stellar Magnitude 14.8 Highest Useful Magnification Not supplied by manufacturer Optical Tube Outer Diameter 12.76" Length of Optical Tube 40.55" Optical Tube Weight 66 lbs. Tube Color or Finish Gloss White Finder Included 7 x 50 Optical Finder Eyepiece(s) Included None Diagonal Included? No - Sold Separately Dew Shield Included? No, Not Necessary Dew Shield Outside Diameter Not supplied by manufacturer OTA Mount Type N/A Power Adapter Included None - Does Not Require Power Objects in Database N/A Alignment Procedure N/A Counterweights Included SEE CODE 27*** SEE CODE 27*** Mount Weight N/A Total Telescope Weight 6 lbs. Tripod Type Included None, Sold Separately
- Included Items
- Takahashi FRC-300 OTA
- Tube Holder
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