~Concept for f/10 - f/4.7 Focal Reducer for Large Telescope~

This was a focal reducer concept for a 3.5m telescope but the project didn't materialize.

Focal reducer concept.
Rendering of optical design. Scale: .8m end to end. Light enters from RIGHT.

Annotated raytrace.
Annotated raytrace. Light enters from RIGHT.

Spot diagram array.
Spot diagrams. RMS diameters around 25 microns here. Design was still conceptual when I stopped working on it; this would have been improved.