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Takahashi has re-introduced the large 645 reducer QE for the FSQ-106ED/EDX and the CCA-250. This reducer uses four lenses in four groups to produce a large Ø60mm image circle suitable for large chip CCD cameras.
The reduction factor is 0.73x which produces f/3.6 380mm with the FSQ and f/3.6 912mm for the CCA-250. The result is a sharp image across the entire image circle.
This large reducer is highly corrected and has a reduced spot size that is improved as is the special flat multi-coating reduces reflection when compared to conventional green multi-coating.
In order to give maximum rigidity to the reducer, the reducer screws into the rear cell of the FSQ and CCA-250. Additionally, the CCA-250 CAA can be used to allow the camera/reducer package to be rotated. The reducer is inside of the CAA and does not contact the CAA in any way.