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I'm with Geoff on this...reducing a F4 scope down with a focal reducer will probably give you a huge amount of Coma.
If you had say a f7 scope reducing it down to F5 then that wouldn't be a problem..the problem is your scope is fast enough as is.
Ed80 is the way to go....a quality focal reducer would cost a packet anyway...ed 80's are going cheap now a days.
If money is the problem...save for the ED80 instead of wasting your money on a focal reducer that your not going to be happy with any way.
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