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About 4nt4res

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  1. Ok, I got some measurements, the male part that screws inthere has a diameter (tip of the threaded part) of 54.4mm (2.14 inches) and 1mm pitch. I can't connect that to any standard...
  2. Hello everyone, I am currently using 150/750 Newton Skywatcher telescope to experiment on some self made optical device designed to be mounted on its focusing tube. This optical prototype is quite heavy for the moment so I plan to use the threaded part of the focusing tube that becomes available once you unscrew the 50.8mm (2”) adapter. ( You can see what i am talking about on the attached pictures) I'd like to know the exact standard dimensions of this threaded part so I can make/buy the right adapter for it. Has anyone already used this threaded cylinder? Would anyone have some cad drawing of it? I don't have any caliper available for the following weeks, and the standard has a high probability to be imperial, which i'm not quite familiar with (i'm writing from Europe). I would be extremely thankful for your help! 4nt4res
  3. So 3 scopes in the end... Thanks for this very detailed answer Martin
  4. Wow thank you for your link Martin! I am more into nebulae and galaxies. I don't exactly know the limiting magnitude yet, as i want to use my instrument with a camera and pauses up to 10 mins, so it will also depend on the the CCD or CMOS chip I use (with Peltier!). I want to make something compact so I'll go for a 5 inches aperture. I think the magnitude would be around 13, so probably 16 with a good camera set up
  5. Hello everyone, I am currently making a telescope and I would like to optimize its optics in relation to the range of sizes of the majority of deep sky objects. This naturally led me to look for some kind of digital listing/table indicating the apparent sizes (in arcminutes) and magnitude of a large number of these objects so I can make some quick statistics about it. I already found this information for the messier catalog but it is way too small to make any accurate statistics... I would be extremely thankful if you could indicate me where to look for this kind of files. Thank you for your help! 4nt4res
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