Figure 2. Processor and Figure 3. Display on 
Teletype Processor 
We made slits at O, 0.2375, 0.475, 0.7135 and 0.95 fractions 
of the distance from center to corner. 
4.1.4 Azimuth (R,T) 
We tested MTF at each image height in only two slit directions, 
namely radial and tangential, based on the rotationally symmetric 
nature of the optical system. 
4.1.5 Deviations from Symmetry 
Real lenses have deviation from the symmetric nature of the 
system caused by manufacturing errors. We measured four radial 
directions to check local effects of such nonsymmetry and chose as 
directions toward the four corners. 
4.1.6 Anti-vignetting Filter (with, without) 
If we measure MTF for cameras with and without the A.V. filter, 
one can observe the effects of the A.V. filter for image quality by 
comparing the two MTFs. 
4.1.7. Slit Widths 
Two slits are used in our measuring system. One is as an 
object (light source) and the other is the scanning slit. The 
width of the former is 10am and the latter 50m. These slit 
widths effect the blurring of the line spread functions to be 
measured. Our processor compensates for the above error in the 
final MTF results by software digital calculations. 
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