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OKay here is a comparison of image size, the jupiter on the left is unbarlowed, toucam straight in the hole taken using 640x480 res. The one on the Right is the barlowed one, no extension tube, also 640x480 res. If you can work out the magnification of the barlow using that I would be muchly appreciative. I think its around the 3x mark.
OKay Visually its a little lacking in contrast and there are some imperfections in the lens, but using my selection of plossls it really gave me a good idea on what the barlows can achieve. And Jupiter through it witha 4mm eyepiece WOW! it was HUGE!.
I must make mention I was using my TAL-1 which is a 4.5" F7.3
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