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MACROPHOTOGRAPHY TOOLS, TIPS & TECHNIQUES FOR DIGITAL PHOTOGRAPHERS 2012 that requires edge sharpness. For flowers and most subjects in nature, they work very well, and this is how I got started in macrophotography. Also, once you attach a closeup filter to your camera, you can no longer focus the lens to infinity without removing the filter. Higher quality two-element closeup filters do an excellent job. You can attach them to a telephoto lens, normal lens or even a macro lens, so long as they have the correct filter thread size. Closeup filters look like regular filters and come in different diameters and strengths (diopters). They screw onto the front of your lens and permit your camera to be positioned closer to your subject – you can attach them to any of your lenses. Technical information on closeup filters The magnifying power of a closeup filter is measured in diopters, although some companies (e.g., Olympus) indicate the focal length of the closeup filter. Here is how you can convert one to the other and determine how close you can get to your subject with different closeup filters and lenses. Diopter = 1000 mm E.g. +2 Diopter = 1000 mm +4 = 1000 mm Focal length of filter in mm 500 mm 250 mm A +2 Diopter closeup filter will permit you to focus on objects 500 mm from the front of the lens, and a +4 Diopter closeup filter will permit you to focus on objects 250 mm from the lens. Above are four closeup filters. On the left is a Nikon 2 element closeup filter, followed by three Hoya single lens closeup filters. The three 52 mm closeup filters cost me around $50, while the dual element closeup filter was over $150. Robert Berdan | 14
MACROPHOTOGRAPHY TOOLS, TIPS & TECHNIQUES FOR DIGITAL PHOTOGRAPHERS 2012 To Determine the Magnification you can achieve with closeup filters you use the following formula: Magnification = Focal length of camera lens Focal length of closeup lens e.g. 50 mm Normal lens = 0.25 X 200 mm Telephoto lens = 0.4 X 250 mm (+4 closeup) 500 mm (+2 closeup) Diagram courtesy of Wikipedia Robert Berdan | 15
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