Camera Lens

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Material Bk7, Quartz, Caf2, Sapphire
  Diameter 2.5-45mm .
Diameter Tolerance0.05 to 0.1mm
Edge thickness 1mm +/- 0.10mm
 Focal length 0.1% to 2%
Surface quantity  80/50 to 20/10

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Q:What are the digital camera lenses?
Smaller than 50mm is wide-angle lens, because his perspective is relatively wide. Suitable for scenery photography. Larger than 50mm is the focus or telephoto (to 100mm limited), suitable for portrait. Macro and landscape photography.
Q:Canon's 40D is not on the coke, how to determine the camera or the lens of the problem,
It is best to have extra camera and lens, separate to try to know the case, the focus of the lens can be changed in your bad camera, the bad lens for a good camera
Q:What is the requirement for a camera shot?
1, because you are in the concert scene, and the distance from the star is not necessarily, so the lens recommended zoom lens, and is in the telephoto above 2, is to photographed the stars of the moment photos, then ask the shutter time must be fast 3, the more clear the better photos, it requires ISO as far as possible not too high.  
Q:SLR camera lens SLR lens classification
Single-lens reflection of the way it means that its professional positioning, even for ordinary users of entry-level products, also have a lot of excitement. Focal length and aperture are digital SLR (also known as SLR digital camera or simply referred to as DSLR lens parameters of the two most important parameters.
Q:Sony camera lens into the sand, and can switch machine and zoom, just not smooth, but also squeak how to do?
It is recommended to immediately sent to the maintenance point of repair, my home camera also encountered this situation, resulting in the lens can not be extended and the lens can not open the lid.
Q:SLR camera lens thickness, what is the difference!
2, the phase field size: In order to cover the phase field has enough imaging lens lens group also have a corresponding diameter, so the common frame in the frame full size, full width than C, C width of 43, and so on Such push To the DC nail cover so big phase field or even periscope lens is enough, 1-2 mm thickness 3-4 times the zoom lens are not elongated.
Q:Is the SLR camera lens easy to erase?
2. If you can use the blower ball can not clean the dust on the surface of the lens, we can also try to use a soft brush to clean the lens, in general, you can remove dirt and other dirty things, and stubborn stains, such as fingerprints, we will use Suede, lens cleaning cloth or lens paper with a lens cleaning solution to clean up. When scrubbing, be careful not to squeeze the lens surface, because the lens surface covered with a layer of vulnerable coating, it is easy to clean because of being wiped away. The cylindrical hair end from the center of the lens rotation outward, gently sweep, so go to the impurities in addition to the lens. In the purchase of lens paper, be sure to go to the regular professional photography store to buy, do not seek cheap and buy low-quality lens paper.
Q:SLR camera lens focal length problem
70--200 refers to the focal length, focal length from 70 to 200. The larger the focal length, the more farther you can. Travel, if you shoot the scenery is still wide-angle, that is, the focal length is small, such as 18,24 and so on. So the scene is big.
Q:SLR camera lens Cha Cha's ring is how the matter
It is in focus, no problem.
Q:Does the SLR lens focal length and the aperture have a relationship?
The reason why the definition of aperture parameters, because this parameter can be a comprehensive representative of the amount of light. That is no matter how the focal length, as long as the same aperture, then the amount of light into the same. So whether it is 18 or 55 focal length, in the same aperture, the exposure is the same.

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