FAQ about photography

This article will collect brief answers to the most frequently asked questions about photography on the Internet. Answers to many of these questions are covered in other articles, however, to save you time I made this list of questions and answers based on search queries leading to our site.

FAQ about photography

1. Depth of field preview – what is it?

Depth of field preview allows you to evaluate…actually, the depth of field! Clicking on this button you close lens aperture according to the current camera settings. However, be prepared for dark image in the  viewfinder when the aperture is closed. This option is very useful for shooting macro, where depth of field is very important. Also this option can be used to see how bokeh changes depending on aperture open size.  Hence, the following question arises…

2. Why modern lenses have opened aperture all the time?

The so-called” jumping ” aperture is needed for correct operation of the autofocus system of modern cameras. The fact is that autofocus sensors are designed for a specific aperture (on each camera model in different ways). For example on the recent Canon EOS-1D X Mark II AF sensors work at a low aperture, up to f/8.0. However, more simple models of the sensors cannot operate well or change operation mode from more accurate to simpler at the aperture of f/2.8 – f/4.0. Hence, there is a need to keep the lens aperture wide open until you press the shutter button.

3. How to get a picture with sharpness throughout the whole frame?

Usually, when beginners ask this question, they are talking about getting pictures with the same sharpness as, let’s say, picture made with  camera. The fact is that the optics on a DSLR camera has a volume, and noticeable effect of the background blur (bokeh) appears even at medium focal lengths (35-50mm and more).

There are two workarounds:

The first. Purchase a short-focus wide-angle lens (usually even the standard “kit” has a focal length of 17mm or 18mm). When shooting at a given focal length, the background will not be blurred.

The second. Close the aperture as much as possible. For example, at a focal length of 50mm when shooting with Canon 50mm f/1.8 II, to get a frame without a bokeh, you need to close the aperture at f/11 or even more. Unfortunately, this is possible only with very, very good lighting (or with a flashlight). In this case, when buying a portrait or other long-focus lens, you should know what you buy, and should be prepared for the fact that you cannot make “photos with a sharp background like from your phone” when required.

PS Yes, sometimes a phone camera is more handy than DSLR.

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