Please answer some questions about 600d.

I don't know whether to say depth of field or size, but when it comes to the clear range of depth of field, size is usually used.

When it comes to depth of field, we must focus. Focusing is the process of making objects clear. This clear range is called "depth of field".

Small depth of field is used to highlight the subject and blur the foreground and background; Large depth of field is to make the whole picture as clear as possible. Large aperture can make small depth of field, and small aperture can make large depth of field.

Small depth of field on the left and large depth of field on the right ~

Large aperture for mushrooms-small depth of field ~ only make the mushrooms in front clear;

The small aperture of this landscape-large depth of field, makes the foreground and background very clear.

The preview button of depth of field is used to adjust the aperture, which is only applicable to the optical viewfinder (when framing).

The principle is this:

When the photographer takes a picture, the aperture will be set to the maximum by default, so that enough light can enter to see the scene clearly ~ and after pressing the preview button of depth of field, the aperture will be reduced to the set size (provided that you set the aperture size), so as to observe the depth of field effect.

This is the function of the depth of field preview button.

Opening the anti-shake shutter can effectively shake the image within 1/30 seconds.

The smaller the ISO value, the purer it is, which means that the ISO value is purest at 100, but it has little effect on the image quality within 400. Above 600, the picture quality will suddenly drop, and above 1200, it is almost impossible to use.

You can't set multiple focus points, but you can set one ~ such as middle, left, right, global and so on. Of course, it's time for automatic transmission. Manual operation only needs to adjust the aperture size and rotate the lens to focus, and no other options are needed. The principle of multi-focus is actually the depth of field.