Quantitative Measurement of Aberration by Ronchi Test (IV)

(Testing of Sartorius telescope, Zeiss semi apochromatic objective, ƒ=3, 000mm, ø=180mm)

Abstract

The 3rd order aberrations of telescopic objective are measured by Ronchi and Hartmann tests.
The lens tested is a Zeiss semi apochromatic objective ƒ=300mm, ø=180mm.
The values of aberration coefficients calculated from the results obtained by Hartmann test by considering the special characteristics of the aberrations and from those obtained by Ronchi test by solving the simultaneous equations are tabulated.
As mentioned in the previous reports, Ronchi test is preferable in determining asymmetrical aberration and Hartmann test is suited to determine spherical aberration, but in either method the Gaussian focus must be determined by extrapolation method.