Celestron Advanced Stereo Microscope Microscope Basics - Page 19

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Two extremes are the Plan optical microscopes which provide incredible performance with the least amount of aberrations on a microscope and microscopes with plastic optics which give you the most aberrations and the worst performance. Chromatic Aberration - is a failure to bring light of different wavelengths (colors) to a common focus. You may see color fringes or halos especially at the edges of the field of view or around the specimen you are looking at. Chromatic aberration is inherent in achromatic lenses which are the standard type used in microscope objectives but well designed objectives usually hold it to a minimum and within acceptable limits. Distortion - is generally caused when magnification varies from the center of the field of view to the edges. A straight line will be curved as you look near the edges of the field. If the lines are curved outward, this is called barrel distortion and if the lines are curved inward then this is called pincushion distortion. Field Curvature - is caused by the light rays not all coming to a sharp focus in the same plane. The center of the field may be sharp and in focus but the edges are out of focus and vice versa. Spherical Aberration - is when light rays at different distances from the optical center come to focus at different points on the axis. This will cause a blurred image and you will not be able to focus sharply on any object. Recommended Books To help you in understanding microscopes in greater detail and to learn various experiments and other usages of them, the following are recommended books:  "The Microscope Book" by Shar Levine & Leslie Johnstone (Sterling)  "The World Of The Microscope" by Chris Oxlade & Corrine Stockley (Usborne)  "Exploring with the Microscope" by Werner Nachtigall (Sterling)  "The Microscope and how to use it" by George Stehli (Dover)  "Guide to Microlife" by Kenneth Rainis & Bruce Russell (Watts)  "Adventures With A Microscope" by Richard Headstrom (Dover) © 2007 Alan Hale 19

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Two extremes are the Plan optical microscopes which provide incredible performance with the least amount of
aberrations on a microscope and microscopes with plastic optics which give you the most aberrations and the worst
performance.
Chromatic Aberration –
is a failure to bring light of different wavelengths (colors) to a common focus.
You may see
color fringes or halos especially at the edges of the field of view or around the specimen you are looking at.
Chromatic
aberration is inherent in achromatic lenses which are the standard type used in microscope objectives but well designed
objectives usually hold it to a minimum and within acceptable limits.
Distortion –
is generally caused when magnification varies from the center of the field of view to the edges.
A straight line
will be curved as you look near the edges of the field.
If the lines are curved outward, this is called barrel distortion and if
the lines are curved inward then this is called pincushion distortion.
Field Curvature –
is caused by the light rays not all coming to a sharp focus in the same plane.
The center of the field
may be sharp and in focus but the edges are out of focus and vice versa.
Spherical Aberration –
is when light rays at different distances from the optical center come to focus at different points on
the axis.
This will cause a blurred image and you will not be able to focus sharply on any object.
Recommended Books
To help you in understanding microscopes in greater detail and to learn various experiments and other usages of them, the
following are recommended books:
“The Microscope Book”
by Shar Levine & Leslie Johnstone (Sterling)
“The World Of The Microscope”
by Chris Oxlade & Corrine Stockley (Usborne)
“Exploring with the Microscope”
by Werner Nachtigall (Sterling)
“The Microscope and how to use it”
by George Stehli (Dover)
“Guide to Microlife”
by Kenneth Rainis & Bruce Russell (Watts)
“Adventures With A Microscope”
by Richard Headstrom (Dover)
© 2007 Alan Hale