I recently got my RealitysoSubtle 4x5 and gave it a first try last weekend. Well, I knew ist wide, but not that wide... ;-)
Aquarius Water Museum in Mulheim, Northrine-Westphalia, Germany. Amongst the main theme of the museum there is a camera obscura installed in the old water tower.
That was also my first try with 5x4 sheet film, Foma Retropan 320 soft processed in Rodinal, taco style.