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Hi,
There is clearly something not right with the 12" reflector.
If both scopes are properly set up under the same conditions the 12" reflector will clearly outperform that 6" achromat on every single target in the sky; and by quite a margin.
I am guessing the 12" reflector is not properly collimated and also you may have some stray light getting in the tube if you are observing from metropolitan Sydney.
I suggest you check the collimation on your 12" reflector and also get it to a dark sky sight in order for it to do its best.
Cheers,
John B
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