When you place the camera position extremely close to a foreground element as I did with this line of old cars in Havana, Cuba, depth of field is affected significantly. If you focus on the foreground -- and in this shot I focused on the yellow car -- the distant background won't be tack sharp unless you use a small lens aperture. Here I used f/16, and because the sun was bright I had enough light to hand hold the picture with an ISO of 400. My shutter speed was 1/640, so the picture was in no danger of being blurred. If I had taken the picture where the camera was, say, 20 or 30 feet from the yellow car, then the composition would be sharp from front to back at any lens aperture especially because I used a 24mm wide angle.
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