Optical Design Study 2

Rapid Rectilinear, Petzval and Triplet lenses

The following lenses should be f/5.6 with a focal length of 50 mm and half field-of-view of of 24°. Optimize over three fields (0, 16, and 24 degrees) and three wavelengths (d, F, C). Use two Schott preferred glasses in these designs.

1. Design a rapid rectilinear lens. You choose whether the flint or the crown should be first. Use pickups to keep the doublets symmetric. Vary the air-spacings between the lenses and the stop.

2. Design a Petzval lens (see Kidger p 183-185) starting with two fraunhoffer cemented doublets about a central stop. The Petzval lens may be derived from the rapid-rectilinear by removing the requirement for perfect symmetry between the two separated doublet elements.

3. Design an air-spaced triplet lens (see Kidger p 199-204). Use SK16 for the outer positve lenses and F4 for the inner negative lens. The stop should be near or at the middle lens. Keep the element thicknesses thin. They are not to be used as variables. We are looking for the classic Cooke triplet design. Try to find both solutions for the Cooke triplet.

Compare the performance of different designs within the same lens type and among the three lens types.

For each lens, provide the ZEMAX data file and

1. a full listing of lens data
2. a drawing of the lens
3. rms spot size vs. field
4. focal length vs wavelength
5. ray fans
6. field plot
7. spot diagrams.

Maintained by John Loomis, last updated 9 June 2011