Hello eyepiece ladies and gentlemen.
At an ever increasing age, I think I'd like to retire my small collection of Plossl eyepieces. They are very good and reasonable in price, but the eye relief has been becoming a more important issue.
So, my plans are to eventually, as funds permit build a small set of 82o Explore Scientific eyepieces. ES is my favorite company, for several reasons, and I find their eyepieces comfortable and capable, and (especially when they throw a sale on) affordable.
That's not to take away anything from any other brand at all, they are just in my zone.
In the meantime, and to fill in any FL gaps, I've picked up two, used in good condition Orion Expanse types. One a 6mm Expanse and a 15mm clone, on the way to in the mail.
I read somewhere they are based on the Erfle design. Does anyone know it that's true? If not, what design are they close to, if known?
Also, anyone with these, I'd welcome your assessment.
Thanks very much. Oh and I'll use these with a 6" f/6 DOB, a 102mm f/9.8 Ach, and a 80mm f/7.5 C80ED.