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Hi serge it sounds like your after a good planetary EP.
If that is the case than a good Orthoscopic is the way to go.
There simple design means less ghosting clearer and sharper views and a quick search will find lots to be said about Orthos and simpler designs like Monocentrics(3 elements) on the planets.
The only thing is that at f5 in a Newtonian the mirror aberrations are going to come into the equation. A barlow will help with that by slowing down the light cone .
Orthos only have a 40-45deg FOV due to the design but for planets that is not important and Eye relief is about .75 x the EP ratio. These are not for DS if you want wide field.
University Optics have good Orthos with out having to trade in your car house ect for one.
Another eyepiece that is good for planets if you want a little more versatility in an EP (wider field and longer eye relief for DS views ) ,are the TV Radians , but there going to cost a lot more. They work well in faster scopes due to the 2 extra elements in the EP (which act like a barlow).
I regularly use 25 -12.5mm UO Orthos with a 4X Powermate for the planets and find that combo hard to beat .Comfortable to use with good eye relief and well corrected in an f6 . Any good quality Barlow will work though.
I have tried the Radians and would love to have a set of them though.
Good quality Plossls (like TV)are also a choice for a more versatile EP.
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