aperture (Aperture), Aperture is used to control the lens aperture on the camera the size of the components, is a few slices of very skinny metal membranes formed through the middle of the light . Through the aperture to control depth of field size, lens quality, and go with the shutter to control the measure of light. The larger the aperture prologue,
GHD Green Straighteners, the measure of light entering through the lens the extra. We routinely use the aperture size of the expression of F merits. For sample, f / 1, f / 2, f/2.8......f/22 to represent. The higher the number, the smaller the aperture, and vice versa ambition be.
Aperture F = lens focal length / lens aperture diameter.
descending the criterion aperture is: F1, F1.4, F2, F2.8, F4, F5.6, F8,
GHD Pink Limited Edition, F11, F16, F22, F32, F44 and F64. We can see from the upon formula, to attain the same aperture F value of long focal length lens of short focal width lens aperture diameter than the large.
Similarly, the smaller the aperture value beneath the same focal length lens the greater the efficacious aperture in element period the more the amount of light, for example, from the F4 aperture .0 adjusted to F2.8, the amount of light more than doubled. Zoom lens for SLR cameras, the aperture F value is usually among F2-F22, and for consumption DC, the aperture F value is usually between F2-F11.
relying on the inner structure and differ market situation, a common lens aperture is divided into three categories: fixed aperture,
GHD Blue Straighteners, Water Hou se aperture, cat's eye optical
ring and iris diaphragm.
fixed aperture: As the name suggests, the use of fixed iris lens, the lens aperture firm there is merely 1 hole and can not adjust the size of its aperture. This aperture is usually in the low-end devices such for cell phone camera, camera and optical performance monitor and some additional less claiming on the use of the production.
Water Hou se aperture: the 1st is a array of variable aperture holes of different sizes arranged in a disk approximately the chief axis; cornering circle plate can be shook to the appropriate size of the hole axis, and to control the aperture achieve. Remember the mid-nineteenth century the invention of John Waters Hou se this aperture.
feline diaphragm: the aperture is likewise a mutual framework, labeled as its cat's eye fashion. This aperture namely one oval or diamond-shaped megalopolis cavity of the smooth sheet into two, and 2 half oval or half-diamond page metal aperture formed aboard the row, comparative manoeuvre of the feline diaphragm tin be formed. Since cheap cost and size tin be adjusted, so the cat diaphragm is warmhearted accustom in entry-level expense of DC.
iris diaphragm: is composed of multiple overlapping bent aperture blades form, the aperture leaves can be up to 18, and the greater the number of leaves,
GHD Blue Butterfly 2011, aperture iris diaphragm the more nearly round. The grasp can alteration the blade circuitous aperture the size of the center, and multi-blade design to cater light closer to the circular hole,
GHD Diamond Flag 2011, so immediately the vast majority of consumer-level digital camera and virtually always of the SLR camera lenses have accepted this structure of the iris.
The following is the iris diaphragm
diagram:
the pore size of the lens can be discerned in the picture 1 is a colossal aperture,
GHD IV Pink Straighteners, picture 2 is a small aperture.
The following is the physical structure of the aperture
Figure: