Defying the Physics of Photography (Two Photographs)
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I am often asked about my settings (EXIF data). These were taken at ISO 640, F5.6 at 1/320th of a second on Nikon 300mm F2.8 with vibration reduction. These photographs have been heavily cropped by about 50%. All things remaining equal, to get sharp photographs your shutter speed should be the reciprocal of the length of the lens multiplied by the crop factor (in short 1/300th of a second times 1.5 due to the cropped sensor on the D7200 = 1/450th of a second). Clearly I was not following the rules. In my defense it was a dull day with nothing much to shoot except for the first time the dragonflies were flying about. I could not resist trying to get one hovering in flight. Had I been thinking rather than just taking a shot I might have increased my shutter speed, shot with a wider aperture and seen if I could get a lower ISO. My conclusion is that I can be a little less exact on the shutter speed rule and that sometimes just taking a “shot in the dark” works fairly well.