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Basics Astronomy 1.3

Instruments. Martin Crow Crayford Manor House Astronomical Society. Basics Astronomy 1.3. Last time. More on using the Planisphere a bit of practise. The Constellations through the year. Coordinate systems – locating objects. Finding things on charts.

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Basics Astronomy 1.3

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  1. Instruments Martin Crow Crayford Manor House Astronomical Society Basics Astronomy 1.3

  2. Last time More on using the Planisphere a bit of practise. The Constellations through the year. Coordinate systems – locating objects. Finding things on charts. Martin Crow Crayford Manor House Astronomical Society

  3. This week The sky this week About the use of binoculars. Telescope types. Finders, eye pieces, etc. Types of mount. Setting up and using visually. Martin Crow Crayford Manor House Astronomical Society

  4. About the use of binoculars Adjusting focus and eye separation Eye adjustment Getting comfortable Martin Crow Crayford Manor House Astronomical Society

  5. The sky this week

  6. Telescope types Refractors Martin Crow Crayford Manor House Astronomical Society

  7. Telescope types Refractors Martin Crow Crayford Manor House Astronomical Society

  8. Telescope types Refractors Johannes Helvelius’s 8” Ariel telescope from 1673 had a focal length of 150 feet. Amazingly a lot of science was done using these types of instrument but were made obsolete by technical advances. Martin Crow Crayford Manor House Astronomical Society

  9. Telescope types Refractors The achromatic lens was first invented by an amateur optician Chester Moore Hall but John Dolland was granted a patent in 1758. Martin Crow Crayford Manor House Astronomical Society

  10. Telescope types Refractors The Apochromatic lens was invented Dolland’s son Peter in 1763. Martin Crow Crayford Manor House Astronomical Society

  11. Telescope types Newtonian Martin Crow Crayford Manor House Astronomical Society

  12. Telescope types Newtonian Built in late 1668 by Isaac Newton the mirror was made from Speculum metal. This first telescope had a mirror of just 1 1/3 “ but worked without colour distortion and could resolve the four Galilean moons and phases of Venus. A second version of this telescope was shown to the Royal Society in 1671. A six inch diameter telescope was shown to the Royal Society in 1721 by John Hadley. The mirrors today are made from glass and the surface is Aluminised and are very efficient at reflecting light. Martin Crow Crayford Manor House Astronomical Society

  13. Telescope types Gregorian Invented and described in Optical Promota 1663 by James Gregory First built by Robert Hooke in 1673 Martin Crow Crayford Manor House Astronomical Society

  14. Telescope types Gregorian Gregorian telescope of English manufacture circa 1735 Martin Crow Crayford Manor House Astronomical Society

  15. Telescope types Catadioptic – SCTs, Maks, Astrographs Martin Crow Crayford Manor House Astronomical Society

  16. Telescope accessories Finder scope Martin Crow Crayford Manor House Astronomical Society

  17. Telescope accessories Eye pieces Martin Crow Crayford Manor House Astronomical Society

  18. Telescope accessories Eye pieces Martin Crow Crayford Manor House Astronomical Society

  19. Telescope accessories Barlow lens Star diagonals Martin Crow Crayford Manor House Astronomical Society

  20. Telescope accessories Coma correctors Focal reducers Field flatteners Dew bands

  21. How to work out the magnification f F Magnification = F divided by f Example: F = 500 f = 10 500/10 = 50 Martin Crow Crayford Manor House Astronomical Society

  22. Telescope mounts Alt Az mounts Martin Crow Crayford Manor House Astronomical Society

  23. Telescope mounts Alt Az mounts Martin Crow Crayford Manor House Astronomical Society

  24. Telescope mounts Equatorial mounts Martin Crow Crayford Manor House Astronomical Society

  25. Telescope mounts Equatorial mounts Martin Crow Crayford Manor House Astronomical Society

  26. Telescope mounts Equatorial mounts

  27. Telescope mounts

  28. Setting up and using a telescope Martin Crow Crayford Manor House Astronomical Society

  29. Martin Crow Crayford Manor House Astronomical Society

  30. Any questions Martin Crow Crayford Manor House Astronomical Society

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