The FRC-300 is a flat field Ritchey-Chretien produced by Takahashi.
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.
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 produces a 36mmØ flat circle for CCD imaging at this shorter focal length.
置顶卡
变色卡
千斤顶
显身卡
