I have the Denk standards, had them for a while, since they hit the market. Love them. Not for DSO's as has been suggested, but they CAN be used.
Really the Denks are awesome for lunar and solar use. The views with the 10" newt of the lunar surface is amazing. Ditto the sun with my 63mm refractor and solar filter.
I had illusions of getting a set of top notch eyepieces, but instead tried another of the oldest and ugliest I had. It is (well now THEY are) a pair of Celestron 20mm Erfles, and I haven't really missed anything else.
The Denk needs the OCS unit to ensure that it will come to focus in the newt type scopes, and I also use this with the refractor. It allows either about 1.3x or 3x magnification depending on what combination it is used in. If I need more I simply slip the whole caboodle into the 5x Powermate.
The query related to eyepieces, so let me suggest trying a set of "average" eyepieces first. I have also heard/read that the bino viewer is kinder to average eyepieces, rather than demanding top notch jobs.
As our American cuzzies have a phrase, YMMV. Good luck.
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