lukepower Posted November 17, 2013 Report Share Posted November 17, 2013 Hi there, I am a proud user of a DDM85XL; so for a (theorical) project of a few friends and mine we are aiming for a DDM160, as we play with the idea of a VERY large scope sitting on it. We think about a huge Newtonian scope, where the tube would be as long as 2700mm (!), and weight about 250kg. Alright, the weight might be within the limits of the DDM160, but what about the tube lenght? I recall long refractors weighting not so much, but requiring serious mounts just because of their size... Thanks for your comments Link to comment Share on other sites More sharing options...
D.Weinzinger Posted November 26, 2013 Report Share Posted November 26, 2013 Dear Lukas, for the DDM160, 2700mm is no problem. Best regards, Dietmar Weinzinger Link to comment Share on other sites More sharing options...
lukepower Posted November 26, 2013 Author Report Share Posted November 26, 2013 Die Dietmar, thanks for your answer. Well, how much would be a problem? It should be mounted in Namibia and enjoy not only the clear skies, but also crisp winds... Thank you Link to comment Share on other sites More sharing options...
zordra Posted January 3, 2014 Report Share Posted January 3, 2014 Hi Lukas, the real problem is, that the Newtonian telescope f/4,or faster is always longer than a cassegrain. You need a bigger dome. But a Cassegrain or a Newton-Telescope have almost the same weight. That is the reason, why most of bigger amateur telescopes for photography are Cassegrains. The DDM 160 can carry also e big Newtonian. Best regards Gerhard Link to comment Share on other sites More sharing options...
lukepower Posted January 3, 2014 Author Report Share Posted January 3, 2014 Hi Gerhard, thank you for your consideration. Well, I guess we'll end with either a Casssegrain with the camera in prime-focus, or a newtonian scope. Myself, I just mounted a Cassegrain-Newton (interchangeable secondary mirrors) with about 105kg total weight on my DDM85XL and have no issues (besides the really stringent balancing). If I could make a wish to ASA, I would ask for a brake or something like that to lock down the tube once the scope is parked. In my case, once I close the main mirror covers, the little weight shift is enough to make the tube move and hit the roof Link to comment Share on other sites More sharing options...
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