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you would be too disappointed in the light gathering if you go from an 8" down to a 4" aperture
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Actually, 120 mm = 4.72 inches
I guess the trade-off advantage of the refractor for a 'grab-n'-go' scope is that it is not easily miscollimated, the OTA is relatively light (4 kg), and, as I noted above, although the light-gathering capacity is much lower than the 8" SCT (39% of it, based on considerations of the secondary), the FOV is much wider thanks to the short focal length.