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Yes makes perfect sense in what you are saying.
Sorry i forgot to put that number in the calculations.
Scopes focal ratio is F4.4
So F11.25/4.4 = 2.6 so i just round it down to a 2.5X barlow
F18.7 / 4.4 = 4.25 so round that down to 4X Barlow
F26.5/4.4 = 6.02 so round that down to 6X barlow.
Sorry, just forgot to put that i the original post, sorry for any confusion there.
But thanks heaps, makes it really easy to understand now, at least i can now go back and re read over the that part of the book to know what they are on about now.
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