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I'll also qualify my previous post by letting you know that I live in Northern Sydney and have reasonably high light pollution. Also that the Orion Ultrablock really benefits from bigger apperture. It is a lot more usefull on the 12" than the 8". Only to be expected I suppose, as the extra light gathering in conjunction with the filter is increasing the signal-to-noise ratio (sorry, an electronics term, I'm an electronics dude).
Best check for prices carefully too, I paid $189 for the 1.25" Orion Ultrablock at a Northern Sydney shop, but a Glebe shop has it for $129.
Cheers,
Jason.
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