Sharpening in RAW CS5

I have recently upgraded to CS5. In Raw, Before sharpening I apply a mask of approx. 75%. As I move the sharpening slider over (while holding ALT to view the sharpenng), I can see the sharpening effect amplifying noise- even in the areas that are completely masked. I did not have the issue in the previous version. Am I missing a step?
Thanks
SG

Jeff Schewe wrote:
Tai Lao wrote:
Just so I'm not misled, does "built-in noise reduction" mean that there is still some noise reduction being applied in ACR 5.7 in the demosaicing process even when both Luminance and Color sliders are set to zero (in the Detail tab of ACR 5.7)?
No, I'm pretty sure that while the rest of ACR 5.7 is the same process as 5.6 and earlier, the noise reduction has been removed from the demosiaicing of 5.7. To have 5.7 match 5.6 you'll need to add or increase the luminance noise reduction 15-20 units. That's about the effects that was removed.
As Eric Chan explaines in the linked thread over on LuLa, the demosaicing process involves interpolation and there will necessarily be some degree of noise reduction with all commercially available raw converters, including ACR and Lightroom.
http://luminous-landscape.com/forum/index.php?s=&showtopic=33419&view=findpost&p=272145

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