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1, the hood has a variety of sizes, should be chosen with the lens focal length of the kind of match, buy must confirm the size, or directly with camera to match!
2, but also note that the shorter the focal length, the greater the angle of view, the shorter the hood. If the lens hood of the standard lens is used on a wide-angle lens, it is bound to result in imaging which can not be imaged around the screen. On the contrary, it can not play the role of the hood. When using a zoom lens, it is best to fit a retractable lens hood for personal use.
3, the hood is widely used for backlighting photography, generally can avoid glare. However, glare can still occur if the light source is near. At this point, you can use your hand to shade the hood at the side of the light source. Glare should be removed from the viewfinder.
When using a hood, you should take account of the factors that work with the flash, because sometimes the former often blocks the light from the flash.
4, the lens hood is used to weaken the light from the shooting area outside the glare of the lens interference, so it can only be used in focusing when the front of the lens does not rotate. Generally speaking, the longer the hood, the better the effect of blocking stray light. But the flat hood is too long, it will cause occlusion screen four corner phenomenon. The petals cover the corresponding picture four angle position is concave, to the "way" picture of the four corners of the light, in the premise of the four corners of the screen block, its petals equal to extend a length in the hood, can provide a better shelter than round hood for stray light.
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