I'm not here to win a stupid argument, I'm trying to solve a problem.
You seem to be suggesting that this method used on a transparent/translucent surface would make a less flat surface appear more flat.. Less light leak .
In fact, if anything the opposite is true.
Anyway Dunn also used the feeler gauge method which has nothing to do with light, because he had a set of five dollar "feelers" in his pocket, and a twenty dollar DTI.
Therefore three unrelated methods of measuring were used, all with similar results.
Please don't try to suggest that the 4th D. AE had these tools or anything like them.
Let the readers watch the videos of the three methods. Let them decide ..
Post Edited (07-Apr-15 21:25)