I once did a 1/8th second exposure with my Hasselblad that prints nicely to 11x14. I sat on the floor and aimed the camera up for a photograph of the ceiling of the Wisconsin state capitol building in Madison. The camera was held with both hands, and I pressed up against a stone pillar, resting my arms in my lap. Don't know if that counts. No mirror lockup. Tripods were not allowed, but I used a cable release that I released with my teeth, believe it or not.