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The role of the camera shading ring

發布時(shí)間(jiān)：

2023-02-15 14:35

1. Blurred background

In addition to changing the shutter speed, the 　　 visor can also chεange the depth of field. First, let's g¶et to know the concept of depth of field.

Depth of field: There is a certain length✘ of space in front of the lens (before and after the focus adjus←tment). When the subject is located in this sp©ace, the image on the negative film is exactly between the two circles o®f confusion before and after >the focus. The length of thφe space where the subject is located is called th'e depth of field.

2, SLR cameras that affect the image quality

Compared with consumer-grade digital cameras, the lens of a SLR c×amera adopts a more complex optical lens structurλe and a larger optical lens, and the impact of different sizes of iris on the ✔in-focus image quality ₩of the SLR lens is generall♥y greater.

3, affect the image quality DC

In theory, the size of the vis♣or has nothing to do with the sharpness of the image in the camera's foc us, but because the imaging principle of the optical lens and the→ accuracy of the glass refraction c$annot be 100% consistent with the theoretical ®value, the image quality under different apertures₩ still has a certain degree The difference.

Compared with the optical lens of a SLR camera, the aperture range of a DC lπens is much smaller, especially t∞he minimum aperture value is generally F8™.0.

At the same time, for most DCs, whether at the wide-angle end γor the telephoto end o$f the camera, the maximum aperture (that is, the aperture when the F v₹alue is the smallest) is the aperture with the best≈ focal sharpness, which is what everyone calls it. The best aperture.¥

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