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DX lens VS FX lens

mtalbott

Gladstone, US
137 posts

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mtalbott Silver Member Nikonian since 17th Jul 2006
Mon 01-Jul-13 04:13 AM

I read previous thread about 70-300 having different angle of view FX to DX. I need help on understanding sensors I guess. I thought the MM rating was only the diameter of the lens image. I thought that a 300 MM would have lens image of approx. 6 inches whether it was on FX or DX or 4X5 or 8X10 camera. I thought the actual subject,an animal for instance would show up the same size on all cameras. Otherwise what does the MM stand for if it is not the lens image size. I know it takes approx 330 MM to cover an 8X10 film but considered telephoto on digital camera. If the resulting image on the glass of each camera is same size then there is no reach. Can someone explain please explain in not too technical terms?

Thanks

murl

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