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To elaborate for those who don't have access to the above cited AS&T article: It was about a series of qualitative experiments conducted under idealised controlled conditions. Cassini and Encke were imaged from a high resolution photo placed some distance from the telescope. So effectively it was done under simulated space-telescope-like conditions. The image recorded with the 10" shows just a hint of Encke, the 6" did not show a trace of it, and the 16" showed it clearly.
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