Noise vs. Focus Help

[WiggyboyChris]

We had a shoot last night where high iso's were a must. Indoor, terrible lighting and high action sports to cover. So, here's the problem, or I guess it's a question: Does high noise (1600 iso on the rebel xti) have a negative effect on focus or the sharpness of the image and... How can we fix or avoid this problem in the future? Btw I was using a 50mm 1.8f on that Rebel and my shutter speed was 1/200 to 1/250th of a sec.

[ramblinray]

The amount of light available is what affects how easily focus will be accomplished. Most cameras have some amount of difficulty focusing in low light situations. More light is the ultimate best answer. More expensive answer is to get a 1D(s)MkIII for its low light focusing capabilities and better high ISO noise. Faster glass with good focus speed would help also since you could use a lower ISO. Everything you need is going to cost you money. As far as sharpness is concerned, more noise has the visual effect of not looking as crisp as one with no noise. ISO should have no effect on focusing. Ultimately you have to consider the limitations of the equipment you have available for use. Sometimes you have to accept that your results will be marginal and live with the results.

[WiggyboyChris]

Thanks Ray, what you say makes sense. I guess I better start saving :0