Hi Firstlook, no the power shots are not SLR. I'm not familiar with the powershots, I have used one before... but can't remember if you can adjust the aperture or ISO settings. I'm pretty sure this is for SLR only.
If you can though... for taking shots of Luna, I find it best to set ISO to lowest possible (100 in my case) and then keep playing with the aperture settings until she looks quite dark in the resulting picture. That way her details come out the best as they are not hidden by her glow.
And adjusting the levels after is a must, to bring out all her detials.
Here are a few Lunapics taken last year while she was in full bloom:
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