Talking about the main function of the shading ring

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2023-02-15 14:35

What is the main function of the shading ring? See the following introduc​tion.

(一(yī)) Adjust and control the depth of field. This is ∑an important role of the shading ringσ. Large aperture, small§ depth of field; small aperture, large depth of ∑field.

(2) Affect the image qu∏ality. This is an easil×y overlooked function of the shading ring. Any lens has ✔the best image quality wit♦h a certain aperture, that is, it is least affected by var→ious aberrations. This aperture is com€monly known as the best aperture. The exact position ¶of the best aperture can be measured using a special instrument. Generally sp®eaking, the best stop is located at the lens's maximum aperture reducedδ by about 2 to 3 stopαs. If the lens is larger or smaller than the optim₩al visor, the spherical aberration, longitudinal chromatic aberration, ÷coma, curvature of f>ield, and astigmatism of the lens will increase. Therefore, trβy to use the best aperture when shooting to improv₽e the image quality. The shape of the iris apertu're also affects the image quality. The closer™ the polygon is to a ©circle, the better the image quality .

(三) Adjust the light intensity. This is the basic function of the shading r↕ing. When the light-shiel↓ding ring is adjusted larger, the inc♣oming light intensity increases; when the light"-shielding ring is adjusted smaller, the inc€oming light intensity decreases. It cooperates with the shutter  speed to solve the exposure problem.

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