Increase magnification power with extension
Increase magnification power with extension | ||
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Probably the best way of achieving greater image magnification with an interchangeable-lens DSLR is to extend the distance between the lens and the camera body: The greater the extension, the greater the magnification obtained. A simple formula can be used to determine the extension required for a particular magnification: Lens - Sensor Distance (V) = Focal Length (M+1) where V stands for lens to sensor distance and M stands for magnification. For example, for a magnification of 1×, a 50 mm lens will require a 100 mm (4 in.) extension: V = 50 (1+1) That is, 100 mm. A 100 mm lens will require a 200 mm or 8 inch extension to achieve the same magnification. This extension can be achieved either through the use of rigid extension tubes or flexible extension bellows. Specialist macro lenses such as the Nikon Micro-Nikkor 105 mm and the Canon 100 mm macro lenses have sufficient extension built into the barrel of the lens to achieve a magnification of 1× without the need for further extension. | ||