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  1. B

    General spotting scope questions

    If the central point is central for a central star in the expanded disc with no offset then the scope is collimated. If the scope is out of collimation then there will be more one sided errors. If the scope is collimated there can still be coma, which should look the same all around. I do not...
  2. B

    General spotting scope questions

    If the out of focus stars are central with no signs of offset then it is in collimation. The only possible tweak would be changing the separation of the elements, but repairers may not routinely do this. If the scope is a poor sample it is likely the objectives or other elements are just poor...
  3. B

    General spotting scope questions

    I doubt that any 15-45x65 scope will be much use on birds at 1300m. Maybe with pelicans. B.
  4. B

    General spotting scope questions

    My British survey ex gov. tripod takes 75kg or more and cost me £25. But I had a one arm altaz mount made for the 6 inch Maksutov that would probably work well at 1300m. In fact it works well at 3000m. The Maksutov cost £250 secondhand but long ago. Or a selected Celestron C8 or C9.25, Tube...
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