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Oh dear. Where do I start?
A Barlow goes the opposite way to a reducer.
Ie an f7 scope will become an f14 scope with a 2x barlow.
If your dslr is an aps_c it will be 24 mm corner to corner
The focal length of your scope is xmm.
So the magnification will be x/24..times 2 for a barlow.
Planets will still be very small. The moon will be a printable size.
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