I was trying out the big Petzval. It is such a bright lens that I needed to wait till after sunset in the shade to take photos. It is too big for my regular ND filter, so I'll need to get a bigger ND filter. It doesn't quite cover 9x11 inch. My flat-field correction made the corners bright where they would typically be darkened.
Camera: LargeSense LS911 Pre-Production Camera. Large format digital camera (single shot sensor, size bigger than 8x10 inch). 8 Inch long A T Thompson, Boston Magic Lantern Lens (Darlot France). Santa Clara, CA, USA. Copyright LargeSense LLC. All rights reserved
Founder of LargeSense, the maker of large format digital cameras and backs.