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The eyepiece tube must stick out a few centimeters so you can move it to focus the telescope. Make the length of the principal tube short enough to allow you to grip the protruding part of the eyepiece tube with your fingers as you adjust the focus.

The eyepiece tube must slide smoothly in its channel, but it should not be loose enough to fall out if you hold the telescope vertically.

Paint the inside of the tubes with black opaque paint matte finish or India ink. Secure the cap of the main tube to keep it from pulling away from the tube.

Do not use the diaphragm at first, but leave the objective at the greatest aperture. Point the instrument towards a distant object.

Move forward and backward the eyepiece tube until the image is as distinct as possible. You will soon realize that the image is of poor quality and is never distinct.

This simple objective lens has many defects that produce the poor-quality image. You can reduce some aberrations by decreasing the lens aperture.

This is why we use a diaphragm on the objective. It is a round disk of black stiff paper with a mm-diameter hole in the center.

This diaphragm, placed in front the objective, reduces both the effects of the lens defects and the brightness of the image.

As a consequence, you can only observe objects brightly illuminated by the Sun. To minimize the chromatic aberrations, you will need to replace the spectacle lens you used as the objective for your first telescope with an achromatic lens, as we shall see below.

As soon as you use your telescope, you will see that you cannot hold it steadily enough in your hands to maintain a stable image. You will need to build a support fig.

The first telescope will give you a good feel for lens aberrations fig. In this simple instrument, chromatic aberration is the most conspicuous.

The aberrations can be greatly reduced by means of careful lens design. As it is not possible to limit all kinds of aberrations using only a single lens, objectives and eyepieces are created using multiple lenses.

By selecting different types of glass for the various lenses and using appropriate surface curvatures and distances between lenses, it is possible to control in a satisfactory manner the aberration of the system.

In general, the success of an objective or an eyepiece in correcting aberrations depends on the number of lenses used to make it. For the second telescope, shown in figure 10, we use an achromatic objective , made up of two lenses of different shapes, one converging and the other diverging.

Sometimes they are glued together by means of Canada Balsam or a synthetic resin cemented doublet , other times they are kept separated air-spaced doublet.

These two lenses have different indices of refraction, one high Flint glass , and the other low Crown glass. Hence, the chromatic aberrations of the two lenses act in opposite senses, and tend to cancel each other out, thus producing a much more distinct image than a single lens could achieve.

Usually, these objectives are constructed to reduce other types of aberration as well. Obviously, achromatic objectives vary in quality. In some of them, it is still possible to perceive a residual chromatic aberration, or the images they produce are well focused in the center only, or they produce a pincushion or barrel distortion.

Figure 3 describes the main optical aberrations. In our first telescope, we used a simple magnifying glass as the eyepiece.

Also eyepieces made up of a single lens are affected by several aberrations, particularly chromatic, and with a single lens it is not possible to eliminate them.

In the early s, Huygens showed that he could eliminate chromatic aberration in an eyepiece using a system of two lenses.

Since then, many eyepiece models have been designed to obtain better and better corrections, a wider field corner, etc. However, eyepieces always retain the same basic function of magnifying the real image formed by the objective.

The main parameters that characterize an eyepiece are the following:. In addition to those shown in figure 4, other types of eyepieces can be made by using more lenses.

Such fancy lenses are made for special purposes, and they are usually expensive. With the first telescope you built, images were inverted, and in the section "From Lenses to Optical Instruments" I explained why.

But astronomers don't really care whether they see star images "straight up" or "upside down. They appear to us always as points of light, and to see a point of light upright or overturned does not make any difference.

However, many people would like to use their telescopes for terrestrial observations, in which case "right side up" does make a difference.

Several different methods allows you to erecting images without significantly degrading their quality. Figures 5, 6, 7, 8, 9 show the main erecting systems.

These optical devices are sold with a case and tubes for connecting them with the eyepieces and the focusing systems. During the construction of this second telescope fig.

To build this instrument, you will need: - an achromatic objective with a diameter between 40 and mm, and with a focal length between and mm - an eyepiece with a focal length between 20 and 40 mm.

Any model show in figure 4 is good, with the exception of the Ramsden eyepiece - a rack and pinion focusing system.

It is made up of two tubes sliding one into the other. The inner one is moved by a rack and pinion couple - an image erecting system see figures - the main tube in aluminum 1.

Buy it with a length equal to the objective focal length. Its inside diameter must be greater than the diameter of the objective mounting bracket - adapter ring in black plastic or aluminum - coupling ring in black plastic or aluminum - light shade tube.

You can buy objective, eyepiece, erecting and focusing systems from suppliers who advertise in astronomy magazines, or you can ask an amateur astronomy club for advice.

In any case, make sure to choose diameters for your components such that they will fit each other; otherwise, you will need to fabricate fitting rings.

You will have to make the principal mechanical parts with a lathe. If you do not have one, you can go to a machine shop. Since the parts are all quite simple, you shouldn't need to spend a lot.

In any case, ask for a cost estimate. Students of high schools, technical colleges and universities can often get access to their school laboratories.

If you want to get your own machine tools, you can find commercial Chinese-made lathes that are available for less than a thousand dollars.

For the same price, you can buy also a small used lathe. You cannot simply magnify at will, seeing more and more details. The maximum magnification you can reach with a telescope is limited by the diameter of the objective.

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