On the problem of SLR hood

The style and size of the hood are related to at least three factors:

1, lens frame-only the same size can be installed, which is inevitable:)

2, lens focal length-the choice of hood should ensure that it meets two requirements: it can effectively block the glare of stray light and does not block the camera lens, that is, there is no black corner;

3. The size of the photosensitive material-in fact, the gap position of the lotus petal hood is determined by the size of the photosensitive material (film or CCD, etc.). ).

Different lenses, even if the aperture is the same, have different focal lengths, or use different photosensitive materials, so the hood cannot be universal.