Traditional Culture Encyclopedia - Photography major - Theoretical knowledge of photographic optics [please ask experts to answer]

Theoretical knowledge of photographic optics [please ask experts to answer]

It is the correct exposure, the authenticity of color, the expression of gray scale and the contrast all need the correct exposure.

The depth of field of the photos you take determines which aperture you use.

Why does optical zoom affect the aperture size? This sentence is very vague. Adjusting the optical zoom in automatic mode should affect the aperture size, because a large focal length requires an increase in shutter speed, so the aperture value of the automatic exposure combination will change accordingly.

The imaging quality of a professional camera is related to the size and quality of the CCD it uses, just like 135 film and 120 film. The bigger the better, because the magnification will be smaller. The principle of pixels is formed by software description. No matter how high the pixel is, the quality of imaging hardware is not good, so the core is the quality of imaging unit. The physical imaging quality of a 20-megapixel card digital camera is not as good as that of an 8-megapixel CCD SLR camera.

Scanners have physical resolution and optical resolution. Professional scanners all talk about physical resolution, which is not high, but the CCD size is very large. Ordinary scanners will improve the optical resolution, and the value is scary.