Hello fellow stargazers, in this topic the main subject we will debate is about old 17th century refractors and modern replicas of 17th century telescopes single lens refractor also observations through this instruments single lens refractos where used at the beginning of the 17th century until the middle of the 18th century.
With very long focal lenght's these fancy scopes where at that time very long do to the extremely long focal lenght design to minimize the chromatic aberations.
I have many single lens telescopes made, over the past 10 years, i built a great variety of single lens refractors with focal lenght's up to 4m, tubeless and closed telescopes.
Now i have 3 scopes with great quality a 35/2000mm plano convex refractor named Hevelian telescope, a 26/1980mm meniscus refractor these two are tubeless scopes used as a aerial telescope, a very good quality 27/1250mm closed tube single lens refractor biconvex simetric objective made by Tavi F and 2 aerial very long objective 3500mm and 4008mm mm positive meniscus lens used without eyepieces for solar projection and prime focus observations without eyepieces.
The 26/1980mm long refractor with a very good quality meniscus lens from Surplush.
Edited by Ovidiu Catalin, 08 May 2020 - 12:12 PM.