I was waiting for our 14 day Alaskan Cruise to start and began to play around with my latest lens, the Rokinon 12mm f2.0 the Dailylife Wife got me for Christmas. While an outstanding lens for Star photos, which it the main reason I wanted it, this lens is completely manual and does not have auto focus. Cameras today do not have the micro prisms that made focusing in past easy, so that to do? Really wide angle lenses, like this one, have a trick: enormous Depth of Field (DOF), or the part of the image that is in acceptable focus. On this 12mm with my Canon M2 body, if I focus it on an object at 5 feet away, and set the lens to f5.6, everything from about 2.5 feet (the Arrow) to Infinity is in focus! If I were to set the lens on f2.0, then I would have to set the point of focus to 14 feet, and then everything form 6.78 feet to infinity would be in focus. Set at the same 5 feet at f2.0, only from 3.6 to 8 feet would be in focus.
This shot is a demonstration of that DOF. I believe I took this at f5.6 and set to 5 feet (as a manual lens that information is NOT recorded by the camera body!). With the camera set on the table, the acceptable focus starts at the red arrow, about 2.5 feet from the camera, and it is all in focus to infinity. Or the Wall. Whichever comes first.
~Curtis, waiting on a ship…{!-{>
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