DX Cam Use FX Lens


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tanandrew

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Apr 14, 2008
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#1
Hi , can some one help me if my camera is DX format and i get one FX lens how should i know the 'F' stop increase by how much and wats the format to calculated

Thanks;p
 

Aug 30, 2008
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#2
Aperture will not change. Only the effective focal length. I am assuming you are using Nikon DX camera. It would be focal length x 1.5.

Another adcantage is that you are using the centre of the lens something like the sweet spot:D
 

tanandrew

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Apr 14, 2008
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#3
oic ,thanks i was confuse that 'F' stop and focal length but now i know
 

geraldkhoo

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Jun 15, 2007
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#4
There is an advantage of using FX lenses on DX camera bodies, and it is that you are using the sweet spot of the lens (the center portion). If you use a DX lens on a DX camera, you may (on some lenses) get some viginetting (dark corners), but a FX lens on a DX body is using the center portion of the image. ;)

Another advantage is the crop factor (of 1.5 for Nikon). So a 200mm lens is actuall 300mm.

The down side of a DX body is that you would not be able to go as wide for wideangle lenses (because of the crop factor) as FX bodies.
 

Jun 25, 2008
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Pasir Ris
#6
There is an advantage of using FX lenses on DX camera bodies, and it is that you are using the sweet spot of the lens (the center portion). If you use a DX lens on a DX camera, you may (on some lenses) get some viginetting (dark corners), but a FX lens on a DX body is using the center portion of the image. ;)

Another advantage is the crop factor (of 1.5 for Nikon). So a 200mm lens is actuall 300mm.

The down side of a DX body is that you would not be able to go as wide for wideangle lenses (because of the crop factor) as FX bodies.
only in terms of field of view, NOT magnification. :) something to keep in mind.
 

keltong

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Aug 6, 2007
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#7
only in terms of field of view, NOT magnification. :) something to keep in mind.
Sorry, I newbie leh, when you say only FOV and not magnification, do you mean at eg 200mm, even though it will look like what you see in a 300mm lens, but it will not magnify as much as a 300mm lens? :dunno: Me very confused. :sweat:
 

gymak90

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Jan 5, 2008
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#8
Sorry, I newbie leh, when you say only FOV and not magnification, do you mean at eg 200mm, even though it will look like what you see in a 300mm lens, but it will not magnify as much as a 300mm lens? :dunno: Me very confused. :sweat:
You're almost right.

200mm lens on DX cam, will give a field of view that is the same as 300mm lens on FX.
But in terms of magnification, 200mm on DX is just the same as 200mm lens on FX.
 

Jun 25, 2008
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Pasir Ris
#9
Sorry, I newbie leh, when you say only FOV and not magnification, do you mean at eg 200mm, even though it will look like what you see in a 300mm lens, but it will not magnify as much as a 300mm lens? :dunno: Me very confused. :sweat:
yep as gymak90 said, you see the same area of picture, but the image is not as magnified as if you were using a 300mm lens.
 

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