Traditional Culture Encyclopedia - Photography and portraiture - On aperture and focusing of SLR camera.
On aperture and focusing of SLR camera.
The lens has a parameter called the nearest focal length. Generally, SLR lenses are of great value, which means you have to stay away from objects to shoot. Otherwise, you can't focus;
Second, the lens is marked with the maximum aperture. What you mean by this is that you can use 3.5 at the wide-angle end of 18mm, but it has shrunk to 5.6 at the end of 135;
As for the lowest, it is generally around F22-F32; The best aperture of this lens is F8; At this time, the picture quality is the best;
Generally, the aperture of some high-end lenses is called constant aperture, such as 70-200F2.8, which means that whether it is 70 or 200, the telephoto end can use the maximum F2.8 without shrinking.
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