The optical design

Here is the lay-out of the optical system. The optical diameter was first set to 280 mm, but it appeared that 290 mm could be achieved without sacrificing on performance.

Below, the (matrix-) spotdiagram of the LYNX for a field of 42 mm diameter and a wavelength range of 450-700nm. The black circle indicates the diameter of the airy disc and the boxes measure 25 micron. Practically all the light is concentrated within the airy-disc, making it also attractive for visual observations.

 

 


But how does it look when all wavelengths are combined?

The plot above shows again the circle of the airy disc (blue light) and the spots for all colors combined at the same focus position. The boxes measure here 10 micron for comparison.