Study on Coltman's Correction by Simulation II -C omputation Error and Convergency-

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We performed the Coltman's correction by computer simulation and investigated the number of terms should be used for correction as well as the computation error. In the range of up to 100correction terms, we examined the difference between two computation methods, i. e., single precision and double precision, and compared the calculated results obtained with and without an arithmetic operation processor, also, order of addition operation. We found that the obtained MTF values at zero spatial frequency are similar. Therefore we may conclude that no error due to various computation methods occurs. Moreover, the calculated MTF values at zero spatial frequency are the closest to unity when 58 terms,60 terms, and 62 terms are used. And the corrected results obtained using 58 terms and 62 terms showed no significant difference. Thus we may state that 58 terms are sufficient for correction.
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