Digital Camera Lens Canon Ef24-70F2.8Lii

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Product Description:

Canon EF24-70F2.8L II 

Focal Length & Maximum Aperture24-70mm, 1:2.8
Lens Construction18 elements in 13 groups
Diagonal Angle of View84° - 34°
Focus AdjustmentInner-focusing with USM
Closest Focusing Distance0.38m/1.25 ft.
Zoom SystemRotating Type
Filter Size82mm
Max. Diameter x Length, Weight3.5 x 4.4 in., 28.4 oz. / 88.5 x 113mm, 805g


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Q:Find the popular SLR camera lens
Take 50mm f / 1.4 this is 50mm talk about the focal length, 50mm f / 1.4 is the aperture. This head is fixed focus.   18-135mm f / 3.5-5.6 This head is the zoom head. Focal length of 18-136mm, aperture is f / 3.5-5.6.18 is the maximum aperture of the wide aperture is 3.5, and 135 is the telephoto end can shoot macro maximum aperture is 5.6. This lens is the zoom head.   The greater the aperture the greater the depth of field, the visual is the background is more vague. The greater the aperture, the corresponding f value is smaller, this is a good understanding. Wide-angle range of the general full-width camera 35mm focal lengths below the lens are wide-angle lens, used to shoot landscapes and characters. The scope of the macro should be more than 100 bar, this did not play
Q:SLR camera lens bayonet size is the same
D head can also be used for manual fuselage, and G head can only be used in the automatic body, manual body can not control the aperture size. DX head card mouth of the last lens is small, in the film machine according to a circle of black, the middle of imaging. FX digital machine is the pixel by half of the DX image photos
Q:What does the camera's lens mean? How to understand
Heart: the center of the convex lens can be seen as a light heart. The lens of the camera we use is equivalent to a convex lens, where the film (or the photographic device of the digital camera) is in the vicinity of the focus of the convex lens, or the distance between the film and the convex lens is approximately equal to the focal length of the convex lens. Convex lens can be imaged, generally with a convex lens to do the lens of the camera, it becomes the most clear as the general will not just fall on the focus, or that the most clear as the distance to the distance (like distance) is generally not equal Focal length, but slightly larger than the focal length. The specific distance is related to the distance between the illuminated object and the lens (object distance), the larger the object distance, the smaller the distance (but in fact it is always greater than the focal length). Because we are photographed, the distance between the illuminated object and the camera (lens) is not always the same, such as giving a picture, sometimes, like the whole body, away from the body, away from the body, away from the nearest. In other words, the distance is not always fixed, so that in order to get a clear image, it must be different with the object to change the film to the lens of the distance of the heart, the process of change is that we usually say " Coke ".
Q:SLR camera lens is installed on why the show also did not install.
if still not, put the lens removed, look at the camera and the fuselage The bayonet contact is not dirty or blocked by things, if there is no problem, it may be broken lens, hurry to find it after sale it
Q:How long is the life of the SLR camera, how long is the life of the lens?
Professional-grade SLR camera shutter trouble-free work is the minimum limit of 100,000 times, the middle level of about 80,000 times, the general general amateur about 50,000 times (about the equivalent of reliable shooting 1389 volumes of 36 film). In fact the life of the camera shutter will be longer.
Q:SL camera lens on the VR anti-shake system and OS anti-shake system is different
Example: 1, Panasonic O.I.S (Optical Image Stabilizer) 2, Canon IS (Image Stabilizer) 3, Konica Minolta AS (Anti - Shake)
Q:Camera lens on the 5.0-60MM1; 3.4-5.9 What does it mean
These values are the focal length of the lens, the maximum aperture and other major technical parameters. 5.0-60mm is the lens focal length, the shortest focal length 5.9 mm, the longest focal length of 60 mm, the focal length of this lens can be between 5 to 60 mm. This is the actual focal length of the lens (if the lens is used for the lens of the interceptor or medium frame, the "equivalent focal length" also needs to multiply the respective coefficients.
Q:What is the lens aperture?
All cameras are based on the principle of small hole imaging: take a sealed box, in any side drilling a small hole, and then the hole facing the window, the window of the scene, such as a tree or something, The wall of the box produces a reflection of the tree. If we painted the inner wall with a photosensitive material (loaded with film or CCD / CMOS), this hole in the box is a complete camera. This is the pinhole camera. Since a camera can not need a lens, why now the front of the camera is not a small round hole but a few pieces of glass? And these pieces of glass (lens) also sold so expensive! This is because the hole to be imaged, the hole must be very small, which is the origin of the pinhole camera name. If the hole is as big as the door, the hole will not be like. So we do not have a door image. Hole small into the light amount is small, so play pinhole photography is very patient training, a photo exposure a few minutes to a few hours are common. Moreover, due to the diffraction interference of light, pinhole camera pictures are not clear enough, such as smoke and mirrors in general.
Q:SLR lens filter function and type
en, leon 81:         Leighton 81 Department of warm dimming balance filter, sub-A, B, C, the color of the pale amber can be slightly adjusted to the picture of the blue side of the tendency to restore the true color. In actual use, to Lei Deng 81C as much. 11, Leiden 82:         The mirror is a color balance filter. Light blue, sub-A, B, C, this type of filter is characterized by a small change in color temperature for the light source temperature and film balance color temperature roughly the same under the premise of fine adjustment. Twelve, Leiden 85:         85 series points A, B, C, is a color temperature conversion filter. 85B can reduce the color temperature from 5500K to 3200K. The mirror is amber, suitable for use in sunlight under the light type film.
Q:In the camera lens, 1 / 2.3 inch means what it means
Configuration 1 / 2.3 inch digital camera is usually low-end or although not low-end but most of the telephoto camera (optical zoom more than 10 times), the use of 1 / 2.3 inch advantage is the camera's volume can be done Small, like a card machine and the like are used in such photosensitive components, and the use of a little more photosensitive components of the camera size to do some big, of course, the quality of the image will be better.

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