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BASICS ASTRONOMY 1.3
Martin Crow Crayford Manor House Astronomical Society
Instruments
Martin Crow Crayford Manor House Astronomical Society
More on using the Planisphere a bit of practise.
Coordinate systems – locating objects.
The Constellations through the year.
Finding things on charts.
Last time
Martin Crow Crayford Manor House Astronomical Society
This week
About the use of binoculars.
Telescope types.
Finders, eye pieces, etc.
Setting up and using visually.
Types of mount.
The sky this week
About the use of binoculars
Martin Crow Crayford Manor House Astronomical Society
Adjusting focus and eye separation
Eye adjustment
Getting comfortable
The sky this week
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Refractors
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Refractors
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Refractors
Johannes Helvelius’s 8” Ariel telescope from 1673 had a focal length of 150 feet.
Amazingly a lot of sciencewas done using these typesof instrument but were madeobsolete by technical advances.
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Refractors
The achromatic lens was first invented by an amateur optician Chester Moore Hall but John Dolland was granted a patent in 1758.
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Refractors
The Apochromatic lens was inventedDolland’s son Peter in 1763.
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Newtonian
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Newtonian
A six inch diameter telescope was shown to the Royal Society in 1721 by John Hadley.
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 distortionand could resolve the four Galilean moons and phases of Venus.A second version of this telescope was shown to the Royal Society in 1671.
The mirrors today are made from glass and the surface is Aluminised and are very efficient at reflecting light.
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Gregorian
Invented and described in Optical Promota 1663 by James Gregory
First built by Robert Hooke in 1673
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Gregorian telescope of English manufacture circa 1735
Gregorian
Telescope types
Martin Crow Crayford Manor House Astronomical Society
Catadioptic – SCTs, Maks, Astrographs
Telescope accessories
Martin Crow Crayford Manor House Astronomical Society
Finder scope
Telescope accessories
Martin Crow Crayford Manor House Astronomical Society
Eye pieces
Telescope accessories
Martin Crow Crayford Manor House Astronomical Society
Eye pieces
Telescope accessories
Martin Crow Crayford Manor House Astronomical Society
Barlow lens Star diagonals
Telescope accessories
Field flatteners
Dew bands
Coma correctors
Focal reducers
How to work out the magnification
Martin Crow Crayford Manor House Astronomical Society
Ff
Magnification = F divided by f
Example: F = 500 f = 10 500/10 = 50
Telescope mounts
Martin Crow Crayford Manor House Astronomical Society
Alt Az mounts
Telescope mounts
Martin Crow Crayford Manor House Astronomical Society
Alt Az mounts
Telescope mounts
Martin Crow Crayford Manor House Astronomical Society
Equatorial mounts
Telescope mounts
Martin Crow Crayford Manor House Astronomical Society
Equatorial mounts
Telescope mountsEquatorial mounts
Telescope mounts
Setting up and using a telescope
Martin Crow Crayford Manor House Astronomical Society
Martin Crow Crayford Manor House Astronomical Society
Any questions
Martin Crow Crayford Manor House Astronomical Society