Where are the numbers to the aperture?

At first glance, it appears that all these random numbers in the series have been. But the fact is that all these numbers are made based on a highly scientific process.But why are these numbers so important and how should they remember?

What is the full aperture?

. For example, f/5.6 aperture exactly twice the light passing through the aperture of f / 8 will pass out. So if you want the aperture to F/5.6 aperture of f / 8 you can go and still remain constant exposure, you should use a slower shutter speed yourself exactly twice. Zagr say the shooting speed of 1/200 seconds, you should take it to 1/100 seconds down.

Remembering the numbers to the aperture allows you to easily and quickly switch between different Dyafragmhay calculate the new exposure.

You may be facing the camera with part numbers. But sometimes the diaphragm as well as numbers, the increase or decrease of one-half or one-third of the whole steps are initiated.

Where are these strange numbers?

Span a variety of different lenses, the aperture stop of light is exactly the same. The amount of light input aperture f/5.6 lens on a 52 mm bore and a 72 mm lens aperture is similar.

(Diameter lens that we use) / (focal length) = number of apertures

For example, if you're shooting with a 100mm focal length lens, and your aperture diameter is 25 mm, you're definitely on the diaphragm 4. Because 100/25 = 4.

Now you can probably guess why fast long telephoto lenses (lenses that are very open Dyafragmhay) Vnayab are so much more expensive. Suppose you want a lens with a focal length of 200 mm Canon (such as the famous Nikkor 70-200mm) Aperture 1.8 and will produce, the lens diameter is about 111 mm (200/Diameter = 1.8). The size of the lens and the lens edge and junction filters etc reaches more than 13 cm. Size and weight of this lens to guess!


Now you may think that doubling the input light, how to change the aperture. This value is doubled. Because as you know about the area of a circle, the diameter of a circle is directly proportional to its area. If you double the area of a circle, you have to measure the diameter or the square root of the number 2 is exactly equal to 1.414. All numbers with the aperture diaphragm, which is exactly why your next sizes are multiplied by a factor equal to 1.414:


2.8 = 2.0 * 1,414
4 = 2.8 * 1,414
5.6 = 4 * 1,414

Perhaps this is the first time in the world of photography so you can see and calculate numbers. Primarily professional photographers shoot during the counting and multiplication and division do. The aperture numbers to musical notes as a musician, photographer in mind portrayed. But at least it's a good way to understand and learn Yadsprdn the notes of the first steps in photography.