Canon Lenses Best Prices
Canon EF 70-200 F4 L IS, one of the most famous photographs tele today, consists of four main parts, which are important in the construction of lenses, an objective body, IS (Image Stabilizer system) and the opening. I use this lens for some time and I would like to share I think in four major parts listed below.
Firstly, the lens construction consists of 15 groups and 20 elements of the lens of the lens with a filter diameter of 67 mm and has a zoom range from 70mm to 200mm. On the other hand, there are two UD (Ultra-low Dispersion) on the target and a fluorite lens to greatly assist the scattered light, color balance, sharpness of the image and a ball, while minimizing ghosting. The firm focal length of 1.2 m and the maximum magnification of 0.21 m. It is used for dispersing the light reflected by objects in an image sensor in a camera.
Secondly, with a total weight of 760 grams, the lens body has a diameter of 76 mm and a length of 172. If White has a solid magnesium alloy cover with black rubber zoom ring and a ring of attention and red ring shows how the professional Canon lens, called The target set around a face of the lens. It is used to protect the lens elements, the opening, dust and moisture from the outside.
Thirdly, the opening is 8 circular aperture blades. A maximum aperture (F-Stop number) is 4 and the minimum aperture (F-Stop number) is 32 over the entire focal length. On the other hand, there is no aperture ring on the back the lens opening must be adjusted on the camera. Its functions are to control the amount of light entering the sensor Image and depth of field.
Finally, IS (Image Stabilizer System) contains a special gyroscopic system that moves the lens in the system rotation in the opposite direction of the hand trembling as x-axis and y axis vertical and lateral offset of hands to take photographs. In Accordingly, the motion of shaking hands IS addresses will be canceled and the light that enters the image sensor will be stable. It is very useful when photographers take pictures at low shutter speeds and gives an effect equivalent to shutter speeds approximately 4 stops. With IS This contributes significantly photographers get sharper images in low shutter speed.
In conclusion, the four main elements Canon EF 70-200 F4 key IS lens that are building the lens body, the IS (Image Stabilizer System) and to the objective aperture telephoto professional and outstanding.
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