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12/18/2007 11:43:37 AM · #1 |
I was just wondering. Since the Nikon d80 is not a full sensor if I buy a lens that is not a dx model say a 300 I was told that I would get no more than 200mm out of it. It seems to me it would be the opposite. Can someone explain and should I stick with the DX models or are the vr fine.
Thanks, Jeremy
Message edited by author 2007-12-18 11:43:49. |
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12/18/2007 11:56:23 AM · #2 |
if i understand what you are asking ...
a 300mm gives you the apperant view of a 450mm on the d80
there are no issues of not full frame on the APS sized sensor
going the other direction there are issues of a dx lens on the D3
but the d3 will automatically adjust (if you wish )
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12/18/2007 12:16:08 PM · #3 |
You're mixing some terms here. Let's straighten that out...
Basically, we compare the camera's sensor size to the size of a 35mm piece of film. The D80 has a smaller sensor size, about 1.5x smaller. This has the effect of making the effective focal length of all lenses 1.5x longer than the same lens would be on a 35mm film camera. So, on a D80, a 300mm lens would have an effective focal length of 450mm.
Whether or not a lens is a DX lens doesn't change the effective focal length. A 24mm DX lens will have an effective focal length of 36mm on a D80. The only difference with DX lenses is that they are made for a small sensor. They will usually vignette on a film camera or on a full frame DSLR. The D3 has ways of compensating that we won't discuss here, because they muddy the discussion.
VR has nothing to do with the focal length or the sensor size. It's "Vibration Reduction," and is a technology for reducing camera shake.
edit: clarity
Message edited by author 2007-12-18 12:17:43. |
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12/18/2007 03:17:32 PM · #4 |
Thanks for clearing that up guys. Does the smaller sensor have anything to do with lower light. I wouldn't think it would. Another words in low light is the full sensor better.
Jeremy |
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12/18/2007 05:53:27 PM · #5 |
Originally posted by rupypug:
Does the smaller sensor have anything to do with lower light. I wouldn't think it would. Another words in low light is the full sensor better.
Jeremy |
Given the same number of pixels on the sensor, a smaller sensor will have smaller pixels (I'm oversimplifying), and smaller, more densely packed pixels are more prone to noise. Noise is going to be more apparent in low light, because of higher ISO and/or longer shutter speeds. That said, there's a lot more than just simply sensor size and pixel density that affects the amount of noise a camera produces. If it were all about pixel density, then my D70 would be less noisy than my D300, because there are half as many pixels (6MP vs 12) packed into the same size sensor. But that's clearly not the case. |
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