According to an established tradition, autofocus is activated by pressing the shutter button halfway, and pressing it fully releases the shutter. However, it is often much more convenient to separate the shutter release and autofocus. Back-button focusing or back-button focusing is an autofocus control scheme that is not very popular among amateurs, in which autofocus is activated not by the shutter button, but by an independent button on the back of the camera.
Some cameras have a special focus button AF-ON, and some allow you to reprogram the AE-L / AF-L button so that it is responsible for autofocus, and not for exposure lock. Continue reading
Many people who admire the starry sky on a clear night have a desire to photograph the sight they saw. Unfortunately, these attempts are far from always crowned with success, especially since a person who is accustomed to photographing exclusively during the day with an excess of light is often unclear on which side to approach the shooting in such seemingly unfavorable conditions. Nevertheless, to get a beautiful night shot with saturated colors, clearly visible constellations and a whitish strip of the Milky Way crossing the sky is easier than it might seem at first, and in this article I will try to make it possible to highlight the practical side of the issue. I note that we will not focus on high astrophotography, but rather on ordinary shooting of the starry sky in the context of landscape photography. Detailed shooting of deep space objects (galaxies, nebulae, quasars, etc.) requires very specific skills and tools, while decorating the night landscape with the general plan of the Milky Way is possible for everyone. Continue reading
The bit depth or color depth of a digital image is the number of binary bits (bits) used to encode the color of a single pixel.
It is necessary to distinguish between the terms bit per channel (bpc – bits per channel) and bit per pixel (bpp – bits per pixel). The bit depth for each of the individual color channels is measured in bits per channel, while the sum of the bits of all channels is expressed in bits per pixel. For example, an image in the Truecolor palette has a resolution of 8 bits per channel, which is equivalent to 24 bits per pixel, because the color of each pixel is described by three color channels: red, green and blue (RGB model). Continue reading