My condolences to JB - Off Topic NCAA contentPosted By James Brown |
Hi Rod - it is the quote button that is broken, not the link, your quote buttons are off to the right and not active. I've seen that before. Might be my computer, but I can quote Jim M. See if you can reply and quote your own post.
Anyway, Al Nagler was awarded several eyepiece patents in the 1980s. Some first pages are shown in the image below. You can see the genesis of his Nagler eyepiece design (and I think Ethos etc.) where there is a Barlow type doublet at the objective end, followed by exotic internal and upper eye-side lenses. He is a great innovator. I don't know if he ever tried to enforce any of these patents before they expired. Patent enforcement is very expensive. Jim
Anyway, Al Nagler was awarded several eyepiece patents in the 1980s. Some first pages are shown in the image below. You can see the genesis of his Nagler eyepiece design (and I think Ethos etc.) where there is a Barlow type doublet at the objective end, followed by exotic internal and upper eye-side lenses. He is a great innovator. I don't know if he ever tried to enforce any of these patents before they expired. Patent enforcement is very expensive. Jim