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To correct the field of view ASA uses the correctors designed by Dipl. Phys. Philipp Keller. All correctors have sufficient backfocus to be connected to all popular camera systems.
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The Takahashi FSQ 645 Reducer offers .072X image reduction. Contains four elements in 4 groups and offers a 50% increase in light intensity over the current reducer.
Takahashi has a 645 reducer for the FSQ-106ED and CCA-250. This unit was designedin response to the use of larger chip CCD cameras. The reducer produces a 60mmø image circle that is70% illuminated