- "You're a little fuzzy around 2, start feeling fine around 8, but at 11 you're sharp, focused, and ready to party. The f-stop watch gets you." You know you're a geek photographer when you have an f-stop watch. It was a cool Christmas gift from my son and daughter-in-law who had a great time shopping for me at Photojojo - the most awesomeness place on the net. Canon 5D Mark II, 1/500 sec @ f/6.3, ISO 1600, 100mm macro.