"What is the maximum theoretical resolution I am able to measure with the Siemens star chart?" is a commonly asked question. The small table below gives the answer for some typical situations.

image height [mm] 250 300 400 500 600 810 1000 1200 1500 340 600 810
cycles in the stars 144 144 144 144 144 144 144 144 144 72 72 72
minimal diameter in the
star center [mm]		 16 16 16 16 16 16 16 16 16 16 16 16
limiting frequency [LP/PH] 716 859 1146 1432 1719 2320 2865 3438 4297 487 859 1160
image height [pixel] 1432 1719 2292 2865 3438 4641 5730 6875 8594 974 1719 2320
                         
                         
format                        
16:9 image width [pixel] 2546 3056 4074 5093 6112 8251 10186 12223 15279 1732 3056 4125
resulting Mpixel 3.6 5.3 9.3 14.6 21.0 38.3 58.4 84.0 131.3 1.7 5.3 9.6
4:3 image width [pixel] 1910 2292 3056 3820 4584 6188 7639 9167 11459 1299 2292 3094
resulting Mpixel 2.7 3.9 7.0 10.9 15.8 28.7 43.8 63.0 98.5 1.3 3.9 7.2
3:2 image width [pixel] 2149 2578 3438 4297 5157 6961 8594 10313 12892 1461 2578 3481
resulting Mpixel 3.1 4.4 7.9 12.3 17.7 32.2 49.2 70.9 110.8 1.4 4.4 8.1

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