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A few situations.
I find a 2x barlow on my 12.5mm is more comfortable then viewing thru my 6.5mm. So a 2x barlow should be part of most cases.
When i image with my toucam, i put a 2.4x barlow on what is effectively 6mm to get whatever 6/2.4 is?
The big planet team use 5x barlows to get bigger images.
A 2" barlow should take a 1.25" adapter, so if you are thinking 2" ep's then go down this track
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