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This field flattner/ focal reducer was developed for the Omegon Apochromatic refractor Pro APO AP 85/510 Triplet ED FCD-100 and the Omegon Apochromatic refractor Pro APO AP 96/575 Triplet ED FCD-100. It reduces the focal length of the 96/575 to 530mm (f5.5) and for the 85/510 to 470mm (f5.5).
This Omegon Pro reducer has a fine tuning feature at the sensor end of the device, where the astrophotographer can optimize the distance to the sensor. We recommend using this fine tuning ring to find the optimal distance, but use extension tubes to achieve a solid connection to the camera when the right distance is found.
The field flattner/focal reducer works best with sensors up to APS-C format.
