According to the reputations on this Mountain Rokkor TC-100/4, weak point is nothing but the condition of Backlight. The best way to avoid the influence is cutting unnecessary light source, so to speak noise lighting. Actual scaling of the necessary hood depth led me the conclusion to extend an original one into double length as shown. The way to know the data physically is setting the barrel length at infinity position and close the iris ring in the darkest position. Available hood depth is easily noticed by a single trial so adequately. Helicoid anterior movement allows only 1.2 m closeup capability, E-mount Extension ring broaden the precision world more. In addition, with many brades, round shaped iris figure invites some gentle "Bokeh" taste. Though extremely extended lens hood is equipped on TC-100, but with this condition no inconvenience is experienced except the ultimate noise cutting effect. However resulting form looks so strange and queere, more consideration and deeper reading on it would guide you to the situation to be recommended as a "Functional Beauty", if the required Physical property is well satisfied.
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