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Takahashi has designed a dedicated flattener that is compatible with the FC-76D and all FC-76`s and FS-78`s.
When the dedicated flattener is used it changes the focal ratio to f/7.8 at 594mm when used with the FC-76S or D models.
This produces a 40mm flat field image circle.
FC-76D + 76D Flattener:
Focal length 594mm
F/ratio f/7.8
Image circle 40mm
FC-76 + 76D Flattener:
Focal length 624mm
F/ratio f/8.2
FS-78 + 76D Flattener:
Focal length 658mm
F/ratio f/8.4