Very nice imagess. The fifth one, in phase contrast, is very good - extreme details and the contrast. I can't achieve such results with my phase contrast set. First of all the quality of your phase objectives is excellent.
Translucent circle diameter is reduced from the original, so that got more contrast. The rings are made of foil with print ready on your computer. Do not know if I wrote understandable.
These are sample pictures. This is my iris to PH3 still working on it. To Ph2 is much smaller and transparent ring is about 1 mm thick. I had on hand just such a picture. I do not know if I understand the question?