 algan nustekin |
which view is real i look through the viewfinder of canon powershot a80 digital camera which has 7,8mm-23,4mm zoom lens. I set it to 23,4mm and look through the viewfinder to certain object, then I look to the same object through the viewfinder of nikon f55 lens set to 80mm, however the image in the canon's viewfinder was closer than nikon's. or may be same apart. how could it be? 80mm lens is nearly 4 times of 23 mm but zoom effects are same? I am sure that I did not use canon's digital zoom to prevent this I look through the view finder not at the lcd.
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Jon Close |
The view given by a particular focal length is dependent on the sensor/film size. The A80's sensor is just 5.32mm x 7.18mm compared to 35mm film's 24mm x 36mm. Where a 23mm focal length on the film camera would give a fairly wide angle view, the much smaller digital sensor is recording only a small area in the center of that view, essentially a very tight crop and greater enlargement. This gives a view that is equivalent to what one would have with a 110mm lens on a 35mm film camera. Similarly, much longer focal lengths are needed in medium format (120/220 roll film) and large format (4"x5" or 8"x10" sheet film) cameras to get the same view given in 35mm cameras. For the "normal" view given by 50mm lens, the medium format would need a 106mm, 4x5 would need 185mm, and 8x10 would need 385mm focal lengths.
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