It carries more than the camera itself lens contribute to a specific look in a photo. How sharp is something pictured, what exposure time is necessary and, of course, which section is reproduced on the camera sensor based on the selected focal length. Photographers have to answer these questions themselves before a shoot or a trip..
This article deals with a special type of lens that has been in great demand in recent years: the fixed focal length with large initial or full aperture . One speaks of a lens with a particularly high light intensity if the relation between the maximum open slats of the aperture and the focal length results in the smallest possible number. So that means, ever smaller the aperture number is, about 1.4 or even 1.2, the larger is the maximum aperture and thus the luminous intensity .
In short: the further you can open the aperture on a lens, the more light falls in - even with bad light conditions - on the sensor of the camera. This circumstance is referred to colloquially as the so-called luminous intensity .
Why are high-speed lenses usually more expensive??
Most lens manufacturers have the same focal lengths in their repertoire different light levels . It is noticeable that the high-speed lenses are usually larger and more expensive at the same time. But why is that? Before dealing with this question, one thing has to be anticipated: lenses with a smaller aperture are by no means worse, in some cases they even make something sharper than the representatives with a large initial aperture.
But why do photographers then spend a lot of money on particularly fast lenses? This question can be answered on the one hand with the special picture look , which can only be achieved with such a lens and, on the other hand, with the ability to work in low light lower ISO values and shorter exposure times to photograph.
Bokeh, or the ability to isolate objects and people
Who doesn't know and appreciate those images in which a person in the foreground can be seen sharply while the background is completely out of focus and soft? photography scene the quality of a lens is increasingly judged by the quality of the image elements that are not currently in focus. People then like to talk about bokeh . The bokeh is particularly soft if the lens has as much as possible large opening aperture and the lens elements, including the coating, correspond to the latest optical standards.
If you want people or objects to stand out clearly from the background during a shoot, you don’t just have to choose a lens with a large open aperture, you need it correct ratio between the distances from the camera to the person and from the person to the background. One if possible three-dimensional effect photographers achieve when they are as close as possible to the subject or person and at the same time the background is as far away as possible.
Low-noise and sharp images in low light conditions
As most photographers know, it takes for sharp images the shortest possible exposure time with a low ISO value at the same time. Lenses with an aperture starting value of 2.8 or 4.0 usually mean that at dusk or when photographing indoors, the sensitivity to light must be corrected upwards using the ISO value. The camera then amplifies the impulse that the sensor receives from the incident light and this often results in color noise that can hardly be eliminated even in digital post-processing.
Will use a lens high light intensity used, the exposure time can be kept low, often enough to allow handheld photography, while a low ISO value eliminates noise in the image.
A summary of the high-speed lenses
They are often heavy and expensive due to complex optical calculations, yet most photographers want theirs bright lenses don't miss. First-class photos at night, expressive portraits and razor-sharp images in places where the use of a flash is not possible - this is actually only possible with fast prime lenses. Any photographer who values one special look and up sharp images in bad light, should at least have a common normal focal length with a large open aperture in his equipment.
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