It can be seen in a C11 under very good seeing. We had a couple of great nights a few weeks ago and once Saturn neared the zenith I could see what must be the Encke Gap. I'd never seen it before so I was quite chuffed but also doubted myself a bit. However, if you can see it in a 9.1" then it's reasonable that I saw it in an 11". It came and went a bit with the seeing but was there often enough. It was seen with two eyepieces: a 10mm CZJ ortho (280x) and a 9mm UO HD ortho (311x).
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