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Hi Fred,
The other narrowband filters will do the same as the Ha filter, i.e. just cut the light down.
The sun emits a pretty much continuous spectrum of light over this range and the moon simply acts as a mirror (though some bits will be absorbed, our instruments aren't sensitive enough to detect this) so you'll just get darker frames.
If you recombine in the time honoured Hubble pallete, you'll get an idea of the spectral output of the sun, though the light and dark regions should be slightly different colours as the scattering off the moons surface will effect some wavelengths more than others depending on the surface. This is the only reason we see different shades of grey in the first place.
Cheers
Stuart
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