Diy refractor telescope12/30/2023 ![]() (Don't think so)Īnd a major problem is : will you find a lens manufacturer wiling to do the job. So question is : what if the diameter of this selfmade lenses do not fit in the machine's holders.? Are they prepared to adjust the machine's setup for two lenses with a different diameters. Although some brands do apply multi coatings. These machines will allow spectacles lenses and to apply single coatings only. A vacuum bell-jarr for smaller diameter lenses is arranged to allow certain diameters. Question is who is willing to do this job. With your mirror making experience it would be worth making a spherical mirror of the correct radius to use as a test plate for r1 and r2 on the crown and then test the flint r3 on the crown. The Littrow design would be a good starter as r1, r2 and r3 curves are identical spheres with r4 being flat. If you are seriously considering having a go at making an achromatic doublet I have a pregenerated crown and flint pair for a 5" aperture Littrow design objective you could have. Have you thought about cutting your teeth on a 'relatively' easy long focus achromat doublet? It might be a good stepping stone to your goal I'm personally tempted to try a long focus Crown and flint achromat as my next project, I've seen a book on the subject and figure if I read it enough times I might just stand a chance! The achromat would be relatively easy compared to the triplet I should think, 4 shallow spherical faces for a long achromat, and 6 potentially deeper curves for the triplet (unless you want a slow triplet which might defeat the object?), then of course there is the extra engineering involved with the cell for a triplet, as discussed above. Then again I haven't looked that deeply into triplets so maybe there is stuff out there? As a fellow mirror grinder you'll know that there is literally tons of material out there, but I've not seen anything on grinding, polishing (and possibly figuring) a triplet. ![]() ![]() Wow that's a wonderful ambition you have there Fishie, I can't confess to having the answers to this one other than it would be flipping difficult. ![]()
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