the days of hidden the hidden Engineers test, was a simple sequences of buttons, and in there was a lens test. and these tests were placed on a table at 1 meter with Whitebalance cards, if you did not have a white card, you used plane white paper about 5 sheets, and when we tried doing the test without the cards, it comes back failed, Yep I remember the days
so go take all these measurements you want, it must go back to D.J.I. will they offer the hidden procedure NOT!