Contrast and resolution of different telescopes

The following telescopes designs have been simulated to derive data about their relative levels of contrast and resolution. The method is described in a previous post, Calculating diffraction patterns. However, in summary, the closer the resolution figure is to zero, the better, and the closer contrast figures are to one, the better!

• Resolution is calculated as the radius of the first minimum of the diffraction pattern.
• Contrast is calculated as the ratio of light in a 1 arcsec radius of the focal point to the light in a larger circle (figures are given for 10 and 30 arcsecs). A perfect telescope would have a contrast of 1.0 in this scheme.

UPDATED (2015-05-05): The sampling has been greatly increased (9x) as has the resolution of the spot diagrams (2x), in comparison to the first set of data originally posted. In addition a number of bugs in the calculation methods have been resolved. I am reposting the data in batches, starting primarily with refractors.

Telescope	Resolution (arcsec)	10 arcsec Contrast	30 arcsec Contrast
Schmidt Cassegrain 150mm 37% Obstruction	0.755	0.676	0.667
Schmidt Cassegrain 200mm 34% Obstruction	0.575	0.867	0.858
Schmidt Cassegrain 280mm 34% Obstruction	0.410	0.913	0.906
Maksutov Cassegrain 102mm 33% Obstruction	1.130	0.675	0.661
Refractor 60mm 0% Obstruction	2.140	0.563	0.549
Refractor 80mm 0% Obstruction	1.605	0.748	0.735
Refractor 100mm 0% Obstruction	1.285	0.836	0.825
Refractor 120mm 0% Obstruction	1.070	0.854	0.845
Refractor 150mm 0% Obstruction	0.855	0.858	0.850
Refractor 180mm 0% Obstruction	0.715	0.891	0.884
Refractor 200mm 0% Obstruction	0.640	0.912	0.906
Newtonian 150mm 0.5mm Spider 25% Obstruction	0.800	0.761	0.751
Newtonian 150mm 1mm Spider 25% Obstruction	0.800	0.759	0.746
Newtonian 150mm 2mm Spider 25% Obstruction	0.795	0.752	0.734
Newtonian 150mm 0.5mm Spider 20% Obstruction	0.815	0.792	0.782
Newtonian 150mm 0.5mm Spider 30% Obstruction	0.780	0.726	0.716
Newtonian 200mm 0.5mm Spider 25% Obstruction	0.600	0.881	0.872
Newtonian 300mm 0.5mm Spider 25% Obstruction	0.400	0.915	0.908
Newtonian 400mm 0.5mm Spider 25% Obstruction	0.300	0.939	0.933