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.
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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
The lens "× × mm mm × × mm" is the lens zoom range, such as: 24-70mm focal length 24 to 70 ends can be any zoom.
Shoot vision with telephoto such as: 200mm, 300mm and so on
Shoot macro to use macro lens such as: 100 micro 100mm / f2.8.
Such as digital camera: 3.6 times zoom; f = 6.7-24.0mm / F3.1-6.7 What is the meaning of these data?
F = 6.7-24.0mm refers to the actual focal length of the lens, that is, wide-angle end (near focal length) focal length 6.7mm, telephoto end (far focal length) focal length 24.0mm. With telephoto end (far focal length) focal length divided by wide-angle end (near focal length) focal length, the number is the lens zoom, that is 3.6 times zoom. In the camera's manual generally shows that the lens is equivalent to the number of 35 mm lens.
/ Back F3.1-6.7 refers to the lens aperture size, that is, wide-angle end (near focal length) aperture is F3.1, telephoto end (far focal length) aperture is F6.7. The smaller the aperture value, the greater the amount of light through the lens.
Ordinary home digital camera, shoot vision to use telephoto end, shoot macro with wide-angle end, and some cameras with macro shooting mode.
If it is a SLR camera, it is possible to replace the lens, according to the need to choose telephoto, wide angle, fixed focus, macro and other professional lens shooting.
Hope to answer to your help.
