Boom !  A civil war canon firing demonstration by re-enactors at Gettysburg's National Battlefield.  I arrived at the demonstration area across from the Pennsylvania Monument just in time for the firing and quickly setup the shot knowing I would crop off the top and bottom portions of the frame leaving a panoramic view.  What I had not anticipated was how much the ground would shake when the canon went off which led to a slight bit of camera shake.  Wow those things are loud !

Technical details:
Busch Pressman Model D 4x5 large format press camera.
Graflex Optar 135mm F4.7 lens in a Graphex shutter.
Ilford FP4+ B&W film, shot at ISO 125.
Exposure was 1/60th second at F22.
Developed in Rodinal/Adox Adonal 1:50 dilution for 15 minutes @ 20 degrees Celsius in Mod54 daylight developing tank.   
4x5" negative scanned with Epson V600 and cropped in post to desired size.