SLR camera lens aperture how to see?
Not ~ ~ 18-55 focal lengths ~ ~ ~
You look at the front of the lens should have a diameter of the logo: Φ behind a number ~ ~
You look like the lens looks like 18-55mm aperture 3.5-5.6 this header, if it should be 58mm filter size ~ buy 58mm cover ~ ~
58 is the caliber is the diameter of the lens is to buy UV or the like need to provide the diameter parameters 18-55 is the focal length
There are two kinds of lens caliber:
1. Maximum number of apertures, such as 50mm1: 2, said focal length 50mm maximum aperture 2.0 diameter naturally 25mm.
2. Filter caliber, however, the aperture of the filter is made constant. Such as 67mm72mm and so on.
