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Results 31 - 40 of 51 for Photography
  • A History of Nineteenth Century Photography: Bringing Astronomy and Medicine into Focus
    Article - 23 Apr 2015
    The invention and establishment of the wet collodion process and the dry-plate negative led to great advancements in the fields of astronomy and medicine in the second half of the nineteenth century.
  • A History of Nineteenth Century Photography: The First Objective Lens to Science
    Article - 8 Apr 2015
    In order to better understand the scientific importance of photography it is necessary to explore the medium from its inception in the nineteenth century.
  • Photometer - Definition and References
    Article - 13 Mar 2014
    Photometer is an instrument for measuring the light intensity or optical properties of optical sources or detectors. It operates more like a transducer which converts electric current into mechanical...
  • What is a Focal Point?
    Article - 31 Dec 2013
    A focal point is a common point on the principal axis where all the light rays starting from the object converge.
  • Depth of Focus - Introduction and Meaning
    Article - 27 Dec 2013
    Depth of focus in optics is a measure of the tolerance of placement of the image plane with respect to the lens. In photography, depth of focus refers to the tolerance of the films displacement within...
  • Catadioptric System Definition and Applications
    Article - 27 Dec 2013
    Catadioptric systems may be defined as optical systems that make use of lenses and mirrors for the formation of images.
  • Xenon Flash Lamp - Properties and Applications
    Article - 18 Jun 2013
    Xenon lamps are ionized gas lamps that emit light in various spectral lines, when an electric current is passed through the tube.
  • What is a Photomultiplier?
    Article - 11 Jun 2013
    Photomultipliers or photomultiplier tubes (PMTs) belong to a class of vacuum tubes that convert photons into electric signal. PMTs are known for their ultra-fast response and high sensitivity. They...
  • What is a CCD Sensor?
    Article - 10 Jun 2013
    The CCD (charge coupled device) was first invented at the Bell laboratories in the 1960s. CCDs are thin wafers which consist of a number of buried electrodes that facilitate the movement of electrons...
  • Optical Lenses - How They Work and Types of Lens
    Article - 7 Jun 2013
    A lens can be described as an optical device that transmits and refracts the incident beam by converging or diverging it. A simple lens consists of a single optical element, while a compound lens is...

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