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Camera Lens: Minimum Focusing Distance

All types of lenses available in the market have a point where if we move closer to the object of the photo, then the lens won't focus (blur). In General, this point commonly referred to required Minimum Focusing Distance (MFD) or minimum focus distance. MFD is expressed in units of length (i.e. 0.5 m) measured from the distance of the light sensor in the camera to the object of the photo. If a lens, as the above photo has MFD 0.25 metres (25 cm) minimum object distance means that the image sensor photo photos stay sharp is 25 centimeters, so we bring the photo objects closer to the camera, then the photos will begin to blur.

The Minimum Focusing Distance of quantity information is usually written on the lens itself (like the above photo), if you look at the lens, confused you will still find it on technical specifications in the manual or catalog for these lenses.

Information about the MFD really isn't much useful for common users, but if you're fond of photography macro (close up), how MFD a lens is important information. Since it macro lens is indeed from the beginning designed to meet the needs of the macro, then the photographer for the average macro lens, his MFD could reach 16 cm. and because of this 16 cm distance is measured from the position of the light sensor – a photo object, then we could stick the tip of the allusion to the lens object photo and macro lens is still able to take focus.

While the MFD for the lens SLR (non macro) is usually around 30 cm or more. For example lenses Nikon 50 mm f/1.4 G has written below MFD 0.45 m (equivalent to 45 cm MFD).

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