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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