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由于缩拍制样仪是正弦法测定MTF测量试片的制备系统,所以,只有当它满足了多方面的技术要求时,才能保证MTF测量值的准确性。而目前国内外可用于制备MTF测量试片的各种缩拍制样仪,都是由各种缩拍照相设备改装而成的,对正弦法测定MTF测量试片的制备来说,大都存在缩拍镜头质量不够理想、焦位调焦不太精确以及曝光量调节范围较小等不足之处,在一定程度上影响了缩拍制样的质量和效率。为了提高缩拍制样的质量和效率,只有根据缩拍制样的多方面的技术要求,研制新的制备正弦法测定MTF测量试片的专用精密缩拍制样仪。
Because the downsampling sampler is a sinusoidal method for the preparation of MTF measurement coupons, the accuracy of the MTF measurements can only be guaranteed if it meets various technical requirements. At present, all kinds of miniature sample preparation instruments that can be used to prepare MTF measurement samples both at home and abroad are all converted from various miniature photographic equipment. For the preparation of the MTF measurement sample by sine method, Shooting the lens is not ideal quality, focal point is not very precise focus and exposure adjustment range of smaller deficiencies, to some extent, affected the quality and efficiency of Shouban sample preparation. In order to improve the quality and efficiency of the downsampling sample preparation, we developed a new dedicated precision retraction sampler for the measurement of MTF measurement sample by the sine method only according to the various technical requirements of the downsampling sample preparation.