The 0.93X flattener for the FOA-60 telescope provides a nearly flat (10 micron) image across the entire image circle. The flatter reduces the focal length of the telescope to about 495 mm, making it an f/8.2 instrument.
The 0.93X flattener for the FOA-60 telescope provides a nearly flat (10 micron) image across the entire image circle. The flatter reduces the focal length of the telescope to about 495 mm, making it an f/8.2 instrument.