Depth Of Field For Closeup Photography

When the object distance is less than 10 times the lens focal length, depth of field is very small, arid tables are more appropriately combined and stated in terms of image magnification, rather than focal length and subject distance. The difference in near and far depth also becomes small, and depth is stated in the table as the total zone of probable acceptable sharpness. Geometric calculation of depth of field for asymmetrical lenses (retro, tele, and zoom) is also to be taken as an approximate guide in these zones, because each has been designed for a specific range which may or may not include extreme close-up.

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