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I am not a Aussie but I have been using the Denk 21s for a little over a year now and they are wonderful eyepieces. I use the plural because the D21s were designed with binoviewing in mind and were sold as fully tested match sets to be used in Denkmeier Binoviewers. However they are also excellant single eye viewing eye pieces too. I use them often in my Coronado PST solar scope and they provide superb contrast. I also use a single eyepiece D21 when solar viewing with my 80mm WO ZenithStar refractor w/ Baader white light filter. The desert sky mount allows me to mount these two scopes side by side. It is interesting to compare views. And if you use them in a Denk Binoviewer, the views are spectacular whether you are doing deep space observing or solar observing. If I had to sell all my eyepieces but one, one of my D21s would be the one I would keep.
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