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Hi raymo and thanks for the reply, it's much appreciated.
I am using the complete barlow X2.
When I unscrew the lens, i can't focus nicely at all.
This is probably because the rim of the barlow without the lens seems a little larger and can only sit on the periphery of the telescopes eye piece holder rather than enter it.
I have attached 2 pics I took of the moon tonight.
One is quite obviously without the lens and one with.
I had my setting to ISO 100 and shutter speed 1/2000.
When I took the better pic it did seem quite well focused in the viewfinder.
I do appreciate your help so far.
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