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Ok, tried looking at Saturn with the 480x. Nice big oblong blur. Oh well.
The barlow seems to be ok. It does narrow the FOV, but that is to be expected.
The 5mm Vixen LV (240x Mag) has a FOV of 45deg. The 10mm plossl I have is 52deg FOV. When I barlow the plossl to make it 240x mag it has less of a FOV than the Vixen. I suppose this is normal.
I have not seen any degradation in the quality of images, perhaps a little darker but thats it.
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