To keep it simple....lower pixel density sensors, in the same generation of technology, will generally perform better in low light.
So as others are saying, you can't simple say that FF performs better in low light, but if two cameras are released near the same time (i.e. same technolgy generation) and one is full frame and the other crop, AND they have the same number of pixels, then the full frame camera will have lower pixel density (pixels per inch) and thus give better low light performance.
But really this is just academic. Look at the cameras you can afford and then look at the web sites that let you compare the same image taken with both. That will let you see how equivalent that are or aren't. I like dpreview.com and imaging-resource.com If your choice in camera will effect how fast a lens you can get, look at that too. (i.e. if the cheaper camera lets you buy an f2.8 instead of the equivalent f4.0 lens, then you should look at an image on that camera shot one stop faster since the lens will allow that.)
Hope it helps.
So as others are saying, you can't simple say that FF performs better in low light, but if two cameras are released near the same time (i.e. same technolgy generation) and one is full frame and the other crop, AND they have the same number of pixels, then the full frame camera will have lower pixel density (pixels per inch) and thus give better low light performance.
But really this is just academic. Look at the cameras you can afford and then look at the web sites that let you compare the same image taken with both. That will let you see how equivalent that are or aren't. I like dpreview.com and imaging-resource.com If your choice in camera will effect how fast a lens you can get, look at that too. (i.e. if the cheaper camera lets you buy an f2.8 instead of the equivalent f4.0 lens, then you should look at an image on that camera shot one stop faster since the lens will allow that.)
Hope it helps.
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