A low light photo tip

[gahspidy]

And here are the close up crops of Benny, where you can really see the difference in quality and the effect of pulling exposure that much, even to a RAW file.
Pulling up exposure to that degree in PP introduces alot of undesired effects. The highlights pull up moreso than the shadows and so you have a more contrasty image, less shadow detail, more noise, and also some unusual color shifts begin to occur.

I am not saying that using the under exposing technique is bad, as a matter of fact I use it at times for various things. I might use it if I were already at a higher ISO and I had no other way of getting a faster shutter speed. . .then I would underexpose as much as I needed to tweak that extra speed out.
i only do not agree with the particular application the author suggested as an example. In the situation he described, the shooter would have been better off simply switching to 400 iso. the point of the authors claim was to achieve the high quality of the 100 iso image while having a faster shutter speed. Can't get something for nothin, and in this case the correctly exposed 400 iso would yield a better quality image.

These test examples were done with a Canon XTi. I chose that over the 5D because most shooters out there most likely have a camera compatible with the XTi quality.