Руководство по эксплуатации Konica Minolta SLR

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Journal of Orthodontics, Vol. 33, 2006, 000–000
FEATURES
Comparison of 10 digital SLR cameras
SECTION
for orthodontic photography
D. Bister, Faranak Morderai and R. M. Aveling
Department of Orthodontics, Guy’s Hospital, London, UK
Digital photography is now widely used to document orthodontic patients. High quality intra-oral photography depends on a
satisfactory ‘depth of field’ focus and good illumination. Automatic ‘through the lens’ (TTL) metering is ideal to achieve both
the above aims. Ten

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2 D. Bister et al. Features Section JO September 2006 higher pixel count (the higher the pixel count the N larger the image); increased dynamic range (reproducing lighter and N darker areas better); advanced color reproducibility (ability to reproduce N more colors); tougher camera-bodies (which are better able to N withstand exposure to humidity and dust and are less likely to break on impact); longer battery life; N faster response time to turning the camera on and/ N or shutter release delay

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JO September 2006 Features Section Comparison of digital SLR cameras 3 Pentax only produced the 100 mm macro-lens at the time of testing,); Olympus only produces a 50 mm macro-lens, which takes magnification differences between analogue and digital formats into account. The lenses chosen for this study were kept as close as possible to a 100 mm equivalent (for 36 mm analogue film). Nikon and Fujifilm use a small sensor, which does not fill the 36 mm film-area. A magnification factor of approximately 1

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4 D. Bister et al. Features Section JO September 2006 COLOUR FIGURE (a) (b) Figure 2 (a,b) Depth of field at aperture 4 and 32; please note variation of focus on teeth the original computer generated color using Two bodies were held simultaneously against the right TM ‘SpyderPRO’ by ColorVision (U.S.). The images and left eye of the examiner; the backdrop consisted of were also ‘anonymised’ and assessed by two operators five fluorescent light tubes. The cameras were then (F.M. and D.B.) for color r

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JO September 2006 Features Section Comparison of digital SLR cameras 5 was tested with new single-use standard AA batteries Cameras (Duracell, NVSA Belgium). In the next section cameras will be discussed in alphabetical order according to manufacturer: Results Canon EOS 350 D and EOS 20 D (Canon Inc., Tokyo, A summary of the results is presented in Table 2. Japan). The Canon EOS 350 D has 8 million pixels and has a plastic body. The camera has a small Color fidelity viewfinder (7th place), which

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6 D. Bister et al. Features Section JO September 2006 situations with little light and the other half are dedicated handling characteristics: they work in manual mode for situations with normal and bright light, hence only when using a speed-light and both settings (camera increasing the ‘dynamic range’ of the sensor. However, and flash) had to be adjusted between intra- and extra- for all but the ‘maximum dynamic range’ settings only oral views. The cameras therefore do not use TTL half of the p

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JO September 2006 Features Section Comparison of digital SLR cameras 7 Pentax *istDs (Pentax Corp., Tokyo, Japan). This fidelity was largely determined by the make of film, camera uses the same sensor as the Nikon D100. but the flash unit, as well as the lens used also However, in contrast to the latter camera, the Pentax contributed. In digital photography mainly the sensor images were strongly biased towards red. The camera and the subsequent processing of the data determine the was also very ‘tr

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8 D. Bister et al. Features Section JO September 2006 6 the UK are colour-deficient. Slight variations in color, intra- and extra-oral photography to produce best although occasionally important, are not absolutely results. paramount to taking good orthodontic records. The The cameras, which were consistently ranked best for main aim was to test for ease of use and hence alteration fidelity-fidelity, were among the most complex to use of images was not allowed. (Nikon D100 and Fujifilm S 3 Pro). For

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Authors Queries Journal: Journal of Orthodontics Paper: 3338 Title: Comparison of 10 digital SLR cameras for orthodontic photography Dear Author During the preparation of your manuscript for publication, the questions listed below have arisen. Please attend to these matters and return this form with your proof. Many thanks for your assistance Query Query Remarks Reference 1 Author: Please supply key words Journal of Orthodontics JOR3338.3d 11/7/06 19:17:41 The Charlesworth Group, Wakefield +44(0