Canon Ef 70-200 F4 L Is, one of noted telephoto lenses of the photography world today, is comprised of 4 main leading parts which are lens construction, a lens body, Is (Image Stabilizer system) and an aperture. I have been using this lens for awhile and I would like to share my relate into 4 leading parts as listed below.
[b]Lens[/b]Firstly, the lens building is composed of 15 lens groups and 20 lens elements with a filter diameter of 67 mm and it has a focal distance range from 70 mm to 200 mm. Moreover, there are 2 Ud (Ultra-low Dispersion) lens elements and 1 fluorite lens element which help dramatically light dispersion, color balance, image sharpness and a vignette while minimizing ghosting and flare. It has the closet focusing distance of 1.2 m and the maximum magnification of 0.21 m. It is used for dispersing light reflected from objects into an image sensor in a camera.
Secondly, with a total weight of 760 gram, the lens body has a diameter of 76 mm and a distance of 172. It has a strong white magnesium alloy case with black rubber cover at a zoom ring and a focal ring and a red ring showing as the Canon expert lens, called L-series lens, around a front part of the lens. It is used to protect the lens elements, the aperture, dust and moisture from outside.
Thirdly, the cleft is made of 8 circular diaphragm blades. Its maximum cleft (F-Stop number) is 4 and its minimum cleft (F-Stop number) is 32 throughout all focal length. Moreover, there is no an cleft ring at the back of the lens so the cleft must be adjusted by the camera only. Its functions are for controlling the whole of lighting coming into the image sensor and depth of field.
Finally, Is (Image Stabilizer system) contains a extra gyro theory which shifts lens in the gyro theory in the opposite direction of hand shaking both x-axis and y-axis in order to compensate vertical and lateral movement of hands while taking photos. Consequently, the petition of Is will cancel out hand shaking directions and the light coming into the image sensor will be steady. It is very useful when photographers would like to take photographs in low shutter speed health and it gives an equivalent corollary of shutter speed roughly 4 stops. With the Is, it helps considerably photographers get sharp images in low shutter speed condition.
In conclusion, the 4 main leading parts of the Canon Ef 70-200 F4 L Is lens which are the construction, the lens body, the Is (Image Stabilizer system) and the cleft make this lens as the superior expert telephoto lens.
Canon Ef 70-200 F4 L Is Lens chronicle
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