<title>Interlaboratory Comparison Of Mtf Measurements In Japan</title>

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The working group of Japan Optical Engineering Research Association (JOERA) was organized in 1974 and made interlaboratory'domparisons of MTF measurements and OTF Standardization. MTF measurements were taken at eight to ten places, using two standard lenses. Standard lens II: Petzval type, f/2, f=50mm, infinite conjugate angular field up to 5°, λ=546nm Standard lens III : Gauss type, f/2.8, f=50mm, infinite conjugate angular field up to ±25°,λ=546nm As a measure for international comparison, SIRA Institute and JOERA exchanged their standard lens and performed measurements. The results of MTF measurements showed good coincide on the axis, but the spread of max. ±0.15 off the axis. We have examined the cause of this error. The measurement using monochromatic light except e-line and white light does not show good coincide. Then this year we intend to investigate this subject in both calculation and measurement.

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