Quote:
Originally Posted by Wilso
My three best and favourites,
The little Nikon CFIUW 10x25 , cracking little eyepiece, and yes it’s a microscope eyepiece that I use for astronomy. Super sharp and crystal clear.
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Every plossl and orthoscopic eyepiece in use around the globe for astronomy purposes, is a microscope eyepiece that's had a change of purpose for astronomy. They do a very fine job of it and have done for over 140 years. Since 1860 with the Plossl and since 1880 with the Orthoscopic. Both were originally designed for use in microscopes. There have been countless design variations over the decades to try and improve on them. Some pretty decent eyepieces came out of the variants, including the 5 Element Plossl or Masuyama, as a derivative of the plossl, and the 4 Element and 5 Element Koenigs, as a derivative of the orthoscopic. Albert Koenig was in fact a co worker at Zeiss with Ernst Abbe, who invented and patented the orthoscopic.
Cheers
John B