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I'd argue that you'll loose detail with the ED100. Resolution can go very much with contrast, your 8" F/5 captures ~4x the amount of light which gives better contrast. The 8" also has a slightly longer focal length and a longer focal length will give better resolution (better image scale).
The ED100 is also a doublet, very little to no colour fringing visually but chromatic aberration will soften images as well and imaging is considerably more demanding.
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