วันศุกร์ที่ 15 เมษายน พ.ศ. 2554

Canon EF 70-200 F4 L IS Lens Review

Canon EF 70-200 F4 L IS Lens Review

Canon EF 70-200 F4 L IS Lens Review

Posted: 15 Apr 2011 08:21 AM PDT

Canon EF-S lens

Canon EF 70-200 f4 L IS, one of the lenses famous paintings in the world of photography today is panel 4 is an important part of building lens, a lens body IS (Image Stabilizer) and the system. I am using this lens for a bit 'and I would like to share my opinion in 4 major parts as listed below.

First, the objective of a mixture of 15 groups of lenses and 20 lensesFilter diameter of 67 mm and a focal length of 70 mm to 200 mm. In addition, there are two UD (Ultra-low Dispersion) lenses and a fluorite lens element to help dramatically torch scattering light, the color balance, sharpness, and a cartoon, while minimizing ghosting and. He has the wardrobe Minimum distance 1.2 m and the maximum magnification of 0.21 m. E 'to disperse the light reflected from objects in an image sensor used in aCamera.

Secondly, with a total weight of 760 grams, the lens body has a diameter of 76 mm and a length of the 172nd has strong magnesium alloy cover in white with black rubber with a zoom ring and focus and a show red ring, like the professional Canon L lens to a series called the anterior portion of the lens. used to protect the outer, slow opening, dust and moisture.

Thirdly, the opening made8 circular aperture blades. Its maximum aperture (f number) is 4 and the smallest aperture (f-stop number) is 32 in all focal lengths. In addition, there is no aperture ring on the back of the lens, making the opening only the camera to be adjusted. Its functions are to control the amount of light entering the image sensor and the depth of field.

Finally (Image Stabilizer) system contains a special gyroscope system, the lens moves in the gyroscopic systemopposite direction to shake his hand and X and Y axes to compensate for the lateral and vertical movement of the hands during the photographing. Consequently, the movement direction of the elevator will shake hands and the light of the image sensor becomes stable. It is very useful when photographers would like pictures in slow shutter speed to capture the state and there is an effect equivalent to shutter speeds approximately 4 stops. This helps greatly photographersrazor-sharp images at shutter speeds was.

Finally, four important key elements of the Canon EF 70-200 f4 L IS lens construction are the lens body IS (Image Stabilizer) and the opening system, making this lens, like the exceptional professional telephoto.

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