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12/07/2009 04:43:33 AM · #1 |
Just trying to get a better understanding. I know the EF-S lens are for the 1.6 crop sensors like my 20D. And that the focal length seems to be the amount of zoom.
What I'm wondering is if say a 50mm EF lens will zoom in the same as a 50mm EF-S lens. Or do I have to multiply the EF lens by 1.6 to get the equivalent EF-S focal length?
So would a 50mm EF & a 80mm EF-S (50*1.6=80)lens provide the same amount of zoom? Or would 50mm provide the same amount of zoom regardless of what lens I purchase and only be different if I went to a full frame camera? |
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12/07/2009 05:41:05 AM · #2 |
quoted focal lengths are always with reference to a non-cropped sensor
So a 50mm lens will always be 50mm on a non-cropped sensor regardless of ef or ef-s
So if you have a 50mm EF OR EF-S lens it will be effectively 80mm on your 20d
They always quote EF-S lenses as non-cropped (ie without the 1.6x factor) even though they won't fit a non-cropped sensor!
For example the 10-22mm EF-S lens on a 20d will be the equivalent of a 16-35mm on a 5d non-cropped sensor |
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12/07/2009 05:59:16 AM · #3 |
If I can complicate (?) it further...
The 50mm zoom (whether EF or EF-S) will actually provide the same amount of 'zoom' (magnification) on either a full frame or a crop sensor. It is only the field of view (FOV) which will change.
Of course with a crop sensor you may get more pxiels into that part of the FOV than a full frame... but that is a different question! |
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12/07/2009 06:20:50 AM · #4 |
| Thanks, that cleared things up a lot! |
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