New thread to avoid high jacking a previous thread where this eyepiece was mentioned,
Purchased many years ago and very scarce, in fact my years or research have turned up no others, no photo's of real eyepieces, just drawings and illustrations,
The eyepiece was designed by Hugo Steinheil in 1883, the son of Karl August Steinheil who founded the Steinheil optics Co under the name of C.A. Steinheil & Sohne in 1854, both were clever inventors and worthy of research if the field interests you,
The eyepieces were made in FL of 7, 9, 14, 20, 27, 41 & 54 mm, and designated in the catalogue as A.G. eyepieces, A 1907 catalogue in English is available on the web, the eyepiece is well made, showing high quality workmanship, it's all brass with the outer barrel lacquered, the lacquer is still in good condition on my 9mm version, not bad for a 100 year old eyepiece, according to the catalogue, Steinheil eyepieces were available with STD Steinheil thread, RAS thread (Royal Astronomical Society) or any other fitting if you supplied details my version is RAS as would be expected as it was located here in the UK,
Edited by stevep, 22 April 2019 - 10:51 AM.