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09/01/2007 04:52:19 PM · #1 |
Hi all,
Can someone help me confirm something please?
According to my research, the Nikon AF Nikkor 50mm f/1.8D lens has a crop factor of 1.5 if I use it on my Nikon D50, so it would be the same as using a 75mm DX lens. Am I right in my calculation?
Thanks.
Message edited by author 2007-09-01 16:58:13. |
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09/01/2007 04:55:58 PM · #2 |
Originally posted by tivo:
Hi all,
Can someone help me confirm something please?
According to my research, the Nikon 50mm f/1.8D lens has a crop factor of 1.5 if I use it on my Nikon D50, so it would be the same as using a 75mm DX lens. Am I right in my calculation?
Thanks. |
The 50mm does equal 75mm when put on a DX Camera
A DX lens just has a reduced rear image circle, the focal length is not rebranded as they are on point and shoot cameras. |
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09/01/2007 04:58:48 PM · #3 |
| Perfect. I will use it on my Nikon D50 camera, so that's what I wanted to know. Thanks wavelength. :) |
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09/01/2007 05:03:33 PM · #4 |
Just because I'm sitting here scratching my head...
A 50mm lens is a 50mm lens and a 75mm lens is a 75mm lens no matter what is is. It's still a 50mm lens if it's a DX lens.
The angle of coverage of a 50mm lens on a DX camera, would be the same as a 75mm lens on a 35mm camera, but the actual focal length is still 50mm.
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09/01/2007 05:38:39 PM · #5 |
Focal length is an optical property of the lens, it has nothing to do with the camera it is mounted on. A dSLR with a DX sensor just crops the centre out of the full-frame image, effectively 'increasing' the focal length.
Originally posted by wavelength:
A DX lens just has a reduced rear image circle, the focal length is not rebranded as they are on point and shoot cameras. |
With a P&S is makes sense giving the equivalent focal length along with the true focal length, makes it easier to see what angular coverage the lens will give.
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