How to check used lens before purchase?
All problems when choosing used lenses come down to one thing: they used a lens. This means that they were photographed a lot, put and removed from the camera, stored…

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RAW or not RAW
The RAW format will never be accepted. Never means “never”, and not “not in the near future”. Old photographers remember that before its appearance there were several formats that, although…

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Macro shot
The word "macro photography" usually means photographs taken on a sufficiently large, but still not microscopic scale, i.e. from about 1:10 to 1: 1. Pictures with a scale exceeding 1:…

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aperture transmits

How to find out the pixel size of a matrix?

Why might a photographer need a pixel size? There are enough such situations. Knowing the pixel size can be useful for determining safe shutter speeds when shooting with handhelds, because the smaller the pixel, the more noticeable the camera shake appears in the pictures, and the shorter shutter speed may be needed to eliminate movement. Having no idea about the pixel size of the matrix of your camera, you can not seriously talk about the depth of field, since the allowable diameter of the scattering circle directly depends on the size of the pixel. The value of the diffraction-limited aperture for a particular camera also depends on the pixel size. Finally, it is possible that when comparing multiple cameras, you will want to find out which one has a higher pixel density, which means it provides better detail and is more suitable for shooting distant objects.

The instructions for digital cameras very rarely indicate the pixel size of the matrix, but, fortunately, this parameter is quite easy to calculate on your own.

In most instructions, you can find information about the physical size of the photomatrix, as well as its linear resolution, Continue reading

Image angle

The angle of the image or the angular field of the lens is the angle formed by the rays connecting the extreme opposite points of the frame with the optical center of the lens. In other words, this is the maximum angular size of an object that can be captured using this lens.

The wide angle of the image allows the lens to cover more space due to the small scale of the image. The narrow angle of the image shows less space, but on a larger scale.

Since the frame has a rectangular shape, it is necessary to distinguish the angular field, measured horizontally, vertically and diagonally. In the technical characteristics of photographic lenses, the largest, i.e. Continue reading

Dynamic range

The dynamic range or the photographic latitude of the photographic material is the ratio between the maximum and minimum exposure values ​​that can be correctly captured on the image. In relation to digital photography, the dynamic range is actually equivalent to the ratio of the maximum and minimum possible values ​​of the useful electrical signal generated by the photosensor during exposure.

Dynamic range is measured in steps of exposure (EV). Each step corresponds to a doubling of the amount of light. So, for example, if a certain camera has a dynamic range of 8 EV, this means that the maximum possible value of the useful signal of its matrix refers to the minimum as 28: 1, which means that the camera is capable of capturing objects within one frame that differ in brightness not more than 256 times. More precisely, it can Continue reading

Dynamic range
The dynamic range or the photographic latitude of the photographic material is the ratio between the maximum and minimum exposure values ​​that can be correctly captured on the image. In…

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What is the focal length?
The focal length (FR or ƒ) is the distance between the optical center of the lens and the camera sensor. The larger the focal length, the larger the image scale…

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HDR panorama
HDR is a technology that has existed for more than a year and is an adaptation of the image to the peculiarities of our eyes (the eye never sees the…

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How to find out the pixel size of a matrix?
Why might a photographer need a pixel size? There are enough such situations. Knowing the pixel size can be useful for determining safe shutter speeds when shooting with handhelds, because…

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