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| Image1 ; Diaphragm / Aperture |
Diaphragm is a component of lenses that is regulate the entry of object light. in photography, diaphragm commonly called as aperture. the greater number of diaphragm/aperture, the smaller opening. that is mean, greater number, smaller light enter to the camera. Vice versa. smaller number of diaphragm/aperture, more large the opening of diaphragm more light are enter to the camera.
Diaphragm or aperture marked by the letter "f". for example, see the Image1.
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| Image2; sample of diaphragm on the lens |
Diaphragm has several size on the camera
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| Image3; Aperture setting on SLR |
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| Image4; Aperture setting on DSLR |
Like the Image1 above, a small Aperture will generate a vast space, while the large aperture will make the depth of field (Blur). Or simply, the diaphragm aperture means. The effect is greater the aperture, the more narrow the space sharp, meaning that the greater the blur effect for areas outside the depth of focus.
Diaphragm / aperture or f-number will affect the calculation of f-stop. When adjusting the diaphragm (aperture), remember that each stop is marked with a certain f-number value which is described in the following sequence, sequence from large to small, such as the following:
f/1 - f/1.4 - f/2 - f/2.8 - f/4 - f/5.6 - f/8 - f/11 - f/22 - f/32 dst.
In Example:
If we move one-stop from f2 to f / 2.8, then we will reduce by half the intensity of light that entering the camera. but If we move one-stop from f8 to f/ 5.6, then we will add to the intensity of light entering the camera twice that of the previous
Please note that modern cameras generally provide flexibility to change the aperture on a smaller scale, in this case the f-stop changes made in multiples of 1/2 to 1/3 f-stop so that can be found many variations of exposure that can be obtained from arranged value of the diaphragm , For example, between f / 5.6 to f / 8 can be found f / 6.3 and f / 7.1 which has a range of 1/3 stop.
