Use of super wide-angle lens

Obviously, you don't know the most basic knowledge of photography, including equipment, otherwise you can't understand the parameters on the lens. This 2.8 refers to the maximum aperture of this lens. Because this aperture is constant, it is only marked as 2.8, like many apertures are not constant, such as 4.5-5.6.

1, the so-called fuselage aperture adjustment, because it uses an automatic lens, including aperture and shutter, which can be automatically controlled by the fuselage (of course, it can also be manually controlled). The aperture adjustment of the fuselage is the aperture of the lens. Don't you think the fuselage still has an aperture? ......

Back to this 2.8, the so-called constant means that no matter whether your focal length is 1 1 or 16, the aperture can be kept at a maximum of 2.8 (of course, it can be reduced as needed).

2. The position of the red circle is the distance indicator window and the automatic lens. You can ignore that window because it is not very useful (manual lens is needed because it can indicate the depth of field), but it is useful in one case. For example, if it is late, it is difficult to focus and autofocus is almost impossible to shoot the starry sky. Then, you can screw the focus ring to the infinity mark on the far right side of the window.

3. There are many ways to compare pincushion distortion in 3.PS, so I won't elaborate here.

4. Cover the hole and remove it counterclockwise with a little force.

By the way, this head is not full-width, but it can be used on the full-width fuselage, but there is a problem. The focal length below 16 will have obvious black edges, and 16 will be fine.