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Post by vmetoile on Feb 1, 2012 16:54:49 GMT -5
hi everybody !
in binoscope building what is the most dificult aspect of the construction ? also how fast and how slow can be a binoscope ? what is the maximum magnification one can expect ?
any comments or link or personnal realisation is welcome.
thank you
Vincent
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Post by Mike on Feb 2, 2012 14:22:28 GMT -5
Vincent, Maybe someone with more experience will also answer your questions. But, based on my experience the most difficult part is what your going to use to get the image to your eyes... prisms? diagonals? mirrors? Whatever configuration you decide it has to be adjustable to get the correct pupilary distance between your eyes (PD). I don't know that there is a limit either way for the F ratio. I guess it's a matter of how practical it is to have two scopes side by side and mounted in a way to be manageable. The magnification will be determined by what type of lenses ie. classic achromatic or R30 achromatic and the F ratio. We have 150mm F5 lenses that would probably be ideal but they are subject to false color on bright objects and cannot tolerate high magnification. Although I would assume binos would be for large star fields at low magnification anyway. The next step up in F ratio would be F8 and it would take some engineering to get this together and one serious mount to hold it. If I was going to attempt a project like this, I would use our new 150-5 R30 lenses. You would have the short tube of an F5 but the color correction of F7. I know we are also coming out with a 127-8 R30. Two 5" tubes might be more manageable at the F8 length. Probably would still stick to the F5. Hope this helps. A guy not to long ago built his into a wooden box. I think there is a post on this forum.
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Post by borispider on Feb 3, 2012 10:22:15 GMT -5
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Post by Mike on Feb 3, 2012 17:04:47 GMT -5
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Post by borispider on Feb 4, 2012 4:42:15 GMT -5
That's the one I was looking for.
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Post by vmetoile on Feb 5, 2012 7:50:48 GMT -5
thank you very much,mike and borispider i am very interested in dinoscoping. it seem very pleasant to look with two eyes. good sky Vincent
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