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Most of the replies have been in line with what I would have written, so I will spare you the repitition.
The question begs though, "Why bother"?
I always believe aperture rules, so why stop it down? Poor optics? get rid of it.
Less affected by seeing? Wait for a decent night.
F/Reducers are another kettle of fish.
On an f10 SCT they are invaluable, but on an f6 Mak/Newt (assuming an 0.5x reducer giving a total of f3, again "Why"?
I have a .5x reducer and may try it just to see, but at f6 it is nearly fast enough anyway.
Good to experiment, and hypothesise though.
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