Dx vs Fx and lens focal length (need help)

Started Jan 12, 2010 | Discussions thread
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laurence85
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Dx vs Fx and lens focal length (need help)
Jan 12, 2010

Hi,,,

I know there are many image sersor format eg. DX format , FX format which i believe is 35mm or there are larger image sensor. Here, i just want to concentrate on Nikon's DX and FX format. I was trying to find out how the focal length differs by using different types of cameras with a lens. I will make it simple. For example, Nikkor 50mm AF f1.4 lens, if i use that lens on DX format camera, the focal length 50 mm become 75 mm. (or is equalvalent to) Is that correct? so if i use 105 mm lens (which is not DX lens) to a DX format camera (eg. D90, D300, etc ) what is the focal length i can get will be? How to calculate those ratio? or can i have that in a table comparing all the different focal length for DX and FX? thanks.

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help me to improve my photography skills. thanks.

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