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Thanks for your comments Les.
Observation at full aperture. My mask is very easy to put on and off the scope, being held in place by two small Velcro patches. I keep it handy to flip on and off at will.
The Encke division (or more commonly "Encke Gap") was seen only near the vertex of the ring system - the best place to pick it out.
I did a quick google to find out what telescope Encke first observed the gap with but failed to find this out. I note some observers on Cloudy nights claim to have seen it in as small an aperture as 8" !!
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