A summary about the DIY german equatorial telescope mount I have made and used for astrophotography in my observatory. A description of Mel Bartels' 6 inch F2. A homebuilt 10 inch Newtonian truss tube ultralight telescope with a curved vane spider. OSA is a collection of space enthusiasts that engage in a number of space projects both real and speculative. The project briefs will cater to a range of different interests and skill levels.
It seems that you're in Germany. We have a dedicated site for Germany. The Internet Age is changing everything about human invention and the use of technology. The change has been compared to that of the introduction of printing. The old days of grinding and polishing are gone — unless you want to do it!
So it is sobering to recall that seven decades ago many amateur astronomers had to grind their own mirror or lens and construct the telescope tube and mounting with their own hands. Amateurs active during the early 20th century not only required an intense interest in astronomy, they also needed the self motivation, persistence and unique mechanical skills necessary to build their own astronomical instrument. Out of their collective but solitary craft emerged the robust and colorful tradition of amateur telescope making.