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Dunk, I think that for a portable setup a small fast refractor combined with a camera with small pixels can yield very pleasing results. That's why I got an f/6 4" triplet and matched it with a Riccardi, so I now have a neat and lightweight f/4.5 imaging tube that should work nicely with ICX814 and 3nm filters. Was quite busy with other commitments, but hoping to put an image together in the coming weeks (school holidays!), so will see if it is a worthwhile path. Could try to go faster with AP's 0.72x Quad Telecompressor Corrector, but it would be a more pricey option than a Riccardi and would need to check if that would work with a smaller refractor. I didn't go the well established FSQ path becuse I like a somehow longer FL of an f/6 4" triplet that gives me a second option of imaging with just a flattener and at a higher resolution.
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