![]() ![]() OK for this math: Now the rest of the story – Your camera sports a miniature size sensor thus the resulting image is practically worthless unless magnified. If you mount a 300m lens, the magnification delivered is 300 ÷ 21.64 = 14X. The diagonal measure of this rectangle is approximately 21.64mm. This format measures 13mm height by 17.3 mm length. Mount a lens with this focal length and call it magnification 1.Īs an example: Your camera is a Lumix G7. Such a lash-up delivers a 45° angle of view, camera held horizontal (landscape).įind the specifications for your camera’s imaging chip and calculate the diagonal measure of this rectangle. Actually, mounting a lens with a focal length equal to the diagonal measure of the film frame or digital sensor, delivers “normal”. Now you should know that the photographic crowd considers a 50mm mounted on a 35mm film camera delivers a “normal” perspective - thus the 50mm is a “normal” lens. The basis of this rule-of-thumb is: Magnification 1 occurs when you mount a lens with a focal length that is approximately the same as the diagonal measure. ![]() The photographic community rounds this value up to 50mm. The dimensions of the film frame are 24mm by 36mm with a diagonal of 43.3mm. I have pondered this rule of thumb and I discovered it is based on a 50mm lens mounted on a 35mm film camera. If you accept this (I do), then mounting a100mm delivers 2X and a 500mm delivers 500 ÷ 50 = 10X. The astronomical crowd considers 50mm to be magnification 1. ![]()
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