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As for Digital camera, the parallel flat plate made of crystal materials set between lens and image sensor is indispensable optical module to prevent false color occurrence. Also, it reproduces chronic aberration, chroma, astigma, choma and sphere. So, old lens invitation on the Digital sensor frame is exposed to be harmed on the physical performance leading to reduction of lens performance.

While it had been used in front of silver salt film, no interference existed, this is why the image quality is lowered no matter how any photographer might recognize or not. This phenomena should happens without any argument.

On the other hand, we can enjoy the performance of resolution of old good days, how come?

The designing technology was great enough to eliminate such a ill-rumore? Or, the rate of this minus factor might be small enough to ignore the mischievous result. Anyway, I have no idea to give it up to invite old lenses on the image sensor. Anything is acceptable if the result is satisfiable.