Takahashi BRC-250 Baker Ritchey-Chretien 10.2" f/5
BRC-250 BAKER RITCHEY-CHRETIEN FLAT FIELD 100mm?FLAT CIRCLE
D=250mm, FL=1268mm, F/5 INCLUDES LENS SHADE
Takahashi FRC-300, 11.8" f/7.8 flat field Ritchey-Chretien
FRC-300 300MM FLAT FIELD BAKER RITCHEY-CHRETIEN FLAT FIELD 90mm?CCD/PHOTO ASTROGRAPH FL=2310mm