Takahashi Flattener 1.01X for FSQ-85EDX

When originally conceived, the FSQ-85EDX was meant for use with APS-C or smaller CCD or CMOS chips. At image circle radii beyond about 14 mm, field curvature was evident in larger chips. This new flattener will greatly reduce this field curvature, resulting in a practically flat field out to a 22 mm image circle radius.