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Yes it is the Camera which determines the noise. The lens does come into play but not when it comes to noise but rather how sharp the image is. Most len's are sharpest around thier middle aperture and I have seen a ton which are really bad at the 2 ends of the spectrum. This is important as in this situation you will be shooting at the largest aperture and the lens is not sharp, then you are going to end up with a noisy unsharp picture. :)
HAHAHA, I HAVE A BIGGER FLASH THAN THEM.. lol, Thats probably not the anser you were looking for. To be honest, I have never noticed an affect, but I don't really shoot many places where flashes are even close to where I am.
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I do love the flash on the point and shoot going off on the second balcony
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Almost every venue I shoot in flashes are not allowed. And the occasional rude person will use one, blind the musicians and be asked to leave. A zoom is preferable but a prime is a good substitute if you need fast glass and don't have a lot of money. I would also venture to say using a prime will make the shoot more of a challenge to get unique shots which is not a negative but can be a positive making you be more creative with your angles and perspectives.