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Exploring Filter Options for Focal Plane Correctors and Window Design in Astrophotography

This document outlines various configurations for filter positioning in focal plane correctors used in astrophotography. It presents four cases: Case A features the filter at the front of the corrector; Case B has the flat filter positioned between the mirror and the window; Case C employs fixed filters where the flatteners serve as filters with only a window; Case D maintains the current filter as a corrector while using fixed filters. A trade study analyzes the influence of different filter geometries on corrector distances, exploring aspheric and spherical designs.

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Exploring Filter Options for Focal Plane Correctors and Window Design in Astrophotography

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  1. ZTF Extra Filter P. Jelinsky 2013-04-02

  2. Optic Terminology Filter/ Focal Plane Corrector Window 12 flatteners 12 detectors

  3. Filter Options • Case A • Filter at the front of corrector. (Only Window and Flattener) • Case B • Flat filter between mirror and window. • Case C • Fixed filters (make the flatteners the filters, window only). • Case D • Fixed filters (make the flatteners the filters, but keep the     current "filter" as a corrector).

  4. Extra Filter Geometry Flatteners Focal Plane Corrector Window Flat Filter

  5. 12 Segment Trade Study • PTF Corrector Distance = 6075.3 mm; Original Corrector Distance = 6122.4 mm • (A) = asphere; (S) = sphere D D D B

  6. 12 Segment Trade Study (cont) • PTF Corrector Distance = 6075.3 mm; Original Corrector Distance = 6122.4 mm • (A) = asphere; (S) = sphere; (F) = Filter in Front; (R) Filter in Rear A/C Case XIV with Added large filter

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