What is a relationship between the focal length of the lens and the sensor size to achieve the same image area ?
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@HenkHolterman sorry, but i really need help – ovnia Jan 23 '15 at 21:11
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@HenkHolterman ok, approved your edition – ovnia Jan 23 '15 at 21:29
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3see: When do the differences between APS-C and full frame sensors matter, and why? and What is crop factor and how does it relate to focal length?. Also possibly Roger Cicala's lensrentals blog entry on the move to full frame. – inkista Jan 23 '15 at 21:31