Magnifiers/Non-Digital - hand held magnifier
Neutral density filterthorlabs
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No matter your chosen photographic subject, Ted’s Cameras will have the best range of Neutral Density & ND Camera Lens filters to help you capture the most incredible photographs, from popular brands such as Hoya, Manfrotto and Cokin.
nd filter是什么
To find out more about the different types of lens filters and how to use a lens filter, don’t forget to check out our Camera Lens Filter Buying Guide HERE.
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Beam quality refers to the overall energy or wavelength of the beam and its penetrating power. A high-quality beam has a short wavelength, high mean energy, and increased maximum energy. The kilovoltage controls the beam quality. The kVp regulates the speed of electrons traveling from the cathode to the anode and determines the penetrating ability of the x-ray beam. When the kVp increases, the resulting x-ray beam is of higher energy and increased penetrating ability (Figure 5).1,3,4,7,9