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  1. #1

    المقارنة بين حساسات APS-c وحساسات Full frame

    المقارنة بين حساسات APS-c وحساسات Full frame
    أتمنى أن يتم فتح حوار لمناقشة مستفيضة حول المقارنة الفنية بين هذين النوعين من الحساسات الضوئية ومجال استخدام كل منها نظرا لأهمية حجم الحساس على جودة الصورة وعناصرها الفنية الأخرى

    safwatwilson@yahoo.com

  2. #2
    The vast majority of Digital SLRs have whats called a "focal factor". This is another long explanation, but what you need to know is the focal factor for your camera. For example, a Canon Rebel XT has a factor of 1.6. So if you put a 100mm
    lens on it, it's really a 160mm lens (100 x 1.6=160). If you use a Canon 5D, the factor is 1 (also called full-frame), so a 100mm lens is still a 100mm lens.



    1.6x Crop Factor (What's a Crop Factor?)Because these sensors are 1.6x smaller than film, they show an area equivalent to the area shown by a lens 1.6x as long on 35mm film.A 100mm lens on one of these cameras shows the same area of view that a 160mm lens would show on a 35mm film or full-frame camera.Multiply a lens' focal length by 1.6 to get the focal length of a lens which, when used on a full-frame or 35mm film camera, gives the same angle of view as that lens does on one of these cameras.Examples:

    This lens on these cameras
    looks like these do on a 35mm camera
    10mm
    16mm
    12mm
    19mm
    14mm
    23mm
    16mm
    26mm
    17mm
    28mm
    18mm
    29mm
    20mm
    32mm
    24mm
    39mm
    28mm
    45mm
    35mm
    57mm
    50mm
    81mm
    60mm
    97mm
    70mm
    114mm
    85mm
    138mm
    100mm
    162mm
    135mm
    219mm
    200mm
    324mm
    300mm
    486mm
    400mm
    650mm
    500mm
    811mm
    600mm
    973mm
    800mm
    1,230mm
    1,200mm
    1,950mm
    (I rounded these to the nearest mm, and I used the more formal factor of 1.62162, which is 36mm/22.2mm.)EF-S LensesThese are special, shorter lenses designed especially to take advantage of the smaller sensors of these cameras. These lenses don't make an image big enough to work on the 1.3x (1D series) or full-frame or film cameras.The older 10D, D60 and D30 were invented before EF-S lenses, and unfortunately the EF-S lenses wont' work on these cameras.

 

 

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