This morning I decided to take the 70-300mm DO out on the 5D Mark III and leave it at 70mm for testing. Since the lens has a zoom lock at 70mm to keep the lens from extending when being carried, this is convenient and easy. The main purpose for the test was to evaluate this rather strange lens at its smallest size and shortest focal length on a full frame body, pretending it is a prime lens.
While at 70mm this lens has a maximum aperture of f/4.5, I shot at f/8 both for depth of field and image quality. I bracketed for HDR on all these scenes except for the barge, which was moving. I processed that single file in the HDR software anyway and cropped it to 16:9, thus removing water at the bottom of the image.
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