I stopped testing filters shortly after the 92mm thin mount filter. I would have preferred using an 86-mm thin mount however one wasn’t available at the time. I believe the combination of the step-up ring and thin mount filter is less thick than a normal size filter and less as thick as adding a filter system such as either a Wine Country or H&Y. Having stopped the filter testing I went instead to pure image quality attempting to answer a question of what this lens is capable of without any filter.
Testing outside is one thing, how does the lens hold up inside in a narrow space. The mission at Tumacacori worked well as a test bed.
And last one. I had originally set this up as a layered shot shooting one file for the shadows the other for the light. This is not the result of that idea; instead it is one capture. Processed in C1 it shows the amount of detail in the shadows that one can achieve using a GFX100.