![]() In most cases observers will obtain images of the target in each of the three filters. The POLV set is optimized for the visible region of the spectrum and is fully effective from 4500 Å to about 7500 Å. These filters are typically used in combination with a spectral filter which largely defines the spectral bandpass. ![]() The POLUV set is effective throughout the visible region its useful range is approximately 2000 Å to 8500 Å. The polarizers are aplanatic optical elements coated with Polacoat 105UV (POLUV set) and HN32 polaroid (POLV set). ACS contains a set of six filters that are sensitive to linear polarization there are three visible polarizer filters with their polarization directions set at nominal 60 ° angles to each other, and three UV polarizer filters arranged in a similar manner.
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