Martin Crow Crayford Manor House Astronomical Society Instruments

BASICS ASTRONOMY 1.3

Martin Crow Crayford Manor House Astronomical Society

Instruments

More on using the Planisphere a bit of practise.

Coordinate systems – locating objects.

The Constellations through the year.

Finding things on charts.

Last time

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

Adjusting focus and eye separation

Eye adjustment

Getting comfortable

The sky this week

Telescope types

Refractors

Telescope types

Refractors

Telescope types

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

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

Refractors

The Apochromatic lens was inventedDolland’s son Peter in 1763.

Telescope types

Newtonian

Telescope types

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

Gregorian

Invented and described in Optical Promota 1663 by James Gregory

First built by Robert Hooke in 1673

Telescope types

Gregorian telescope of English manufacture circa 1735

Gregorian

Telescope types

Catadioptic – SCTs, Maks, Astrographs

Telescope accessories

Finder scope

Eye pieces

Barlow lens Star diagonals

Field flatteners

Dew bands

Coma correctors

Focal reducers

How to work out the magnification

Magnification = F divided by f

Example: F = 500 f = 10 500/10 = 50

Telescope mounts

Alt Az mounts

Telescope mounts

Alt Az mounts

Telescope mounts

Equatorial mounts

Telescope mounts

Equatorial mounts

Telescope mountsEquatorial mounts

Telescope mounts

Setting up and using a telescope

Any questions

Martin Crow Crayford Manor House Astronomical Society Instruments

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