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#11 |
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Join Date: Apr 2003
Location: Eastern Ontario Canada
Posts: 823
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You divide the focal length of the telephoto lens by the focal length of a normal lens for that format to get a rough idea of binocular power.
In the 35mm world this would be 200mm/50mm = 4x Normal lens on a Nikon DX DLSR would be about 33mm and Canon 1.6 would be about 31mm. It's easier to multiply the telephoto by the crop factor and divide by 50! 200 X 1.5 = 300mm 300mm/50 = 6x Do not confuse this number with the zoom X factor. Binocular power is a real number and zoom X factor is a meaningless marketing number. |
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#12 |
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Join Date: Jan 2007
Posts: 154
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Thanks. That would mean I would need about a 400 mm for the rough equivalent of 8x binoulars which on my Pentax would be about a 270 mm at 35mm equiv.
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#13 |
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Join Date: Jan 2007
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Thanks. That would mean I would need about a 400 mm for the rough equivalent of 8x binoulars which on my Pentax would be about a 270 mm at 35mm equiv.
Figured I should edit both since I double posted. :? |
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#14 |
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Join Date: Dec 2002
Posts: 5,803
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Bob is exactly right.
So your 8x binocs would be the same as a 400mm lens on a 35mm film camera. A 200mm lens (on a 35mm film camera) would be the same as a 4x binocs. Eric |
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