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Condition:
This is an Takahashi 1.01x flattener for the FSQ-85EDX. The flattener itself has never been taken out of the plastic so this in in perfect, brand new condition. It includes its original box.
Description:
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 radios. The two spot diagrams below demonstrate the impact of the flattener on field curvature.
Spot Diagram of FSQ-85EDX Without Flattener
Spot Diagram of FSQ-85EDX with Flattener