I took a study break tonight to try out the extension tube I got to use with my reverse-mounted 50mm f/1.8 lens. This shot is using all three extension pieces together, getting the lens the furthest away from the sensor as possible. It is not cropped any.
Nikon D300 - 1/100 sec - f/8 - ISO 200.
Strobist info: single SB-600 at 1/8 power fired through partially-collapsed 43” Westcott shoot-through umbrella to camera right.