Details about this mode are described in the section ' P, A (AV), S (TV), M'. Therefore, on many cameras, the metering mode exposure с aperture priority called ' A' or ' AV'-' Aperture Value '-' Aperture Value '. The aperture is sometimes also called the 'Lens Aperture' (Latin 'Apertura' - 'Hole'). More details about the difference between the concepts of 'aperture' and 'aperture' can be found in the section about ' T-feet'. And not only the aperture is responsible for the overall 'real aperture' of the lens, but also many other factors: the optical design of the lens, the percentage of light reflection and transmission by the lens, the drop in the aperture number when focusing at different distances, the percentage of light absorption by the photo filter, etc. So, the diaphragm is only responsible for geometric aperture(the ratio of linear geometric indicators). Usually the concept of 'aperture' and 'aperture' are synonymous, but in fact there is a certain sacristy between them. Lens aperture control Nikon ED AF Nikkor 80-200mm 1: 2.8D (MKII). Almost all modern lenses do not have such a ring, and the diaphragm is controlled by the electronics and camera controls. There is usually a marking on the ring, consisting solely of aperture numbers (shown in the figure below). Some lenses have an aperture ring on their body. There is no particular difference in recording. And numerically it can be written in the following ways: F16, F / 16, 16 (such a 'bare' number aperture is indicated on the lens barrel). If we take the same lens, which has a relative aperture 16 times smaller than its focal length, then its aperture number will be equal to 16. Usually it is by this number that photographers directly understand the general term 'aperture'. If we take the number opposite to the relative aperture, then we get the number of aperture. There is no particular difference in the recording, and every photographer will always understand what is at stake. For example, take a lens that has a relative aperture 16 times smaller than its focal length as a result, the relative aperture can be numerically written in the following ways: 1:16 or f1 / 16 or f = 1: 16 or F 1:16, etc. The relative aperture of the lens is expressed numerically by ratio or fraction. The reciprocal of the relative aperture is called f-number or aperture number.
Lens aperture Is the ratio of the effective aperture of the lens to the focal length of the lens. But among them there are small differences, described below. These concepts are strongly related to each other and are synonymous for many photographers. Often the diaphragm is also called ' luminous efficiency ' or 'aperture' or 'relative hole' or ' number F'. Eyes with large pupils have many animals that need to see well at night. At night, you need to do the opposite - open your eyes wider to capture more light, while the pupils also dilate.
If people did not squint, the sun would burn the retina with its strong light. When people look at the sun, they squint their eyes, that is, they reduce the gap through which light passes.
Aperture device in the lens Nikon Nikkor 105mm 1: 1.8 (AI-S)įor a better understanding of the operation of such a device, I will give an example from life.