Meade-instruments DS-2000 Generation II Telescopes with LNT module Instrukcja Użytkownika Pobierz pdf (Strona 45)

Refracting Telescopes use a large objective lens as their primary

light-collecting element. Meade refractors, in all models and apertures,

include achromatic (2-element) objective lenses in order to reduce or

virtually eliminate the false color (chromatic aberration) that results in

the telescopic image when light passes through a lens.

Reflecting Telescopes use a concave primary mirror to collect light

and form an image. In the Newtonian type of reflector, light is reflected

by a small, flat secondary mirror to the side of the main tube for

observation of the image.

In the refracting telescope, light is collected by a 2-element objective

lens and brought to a focus at F.

In contrast, the reflecting telescope uses a concave mirror for this

purpose.

Eyepiece

2-Element

Objective Lens

Eyepiece

Concave

Mirror

Secondary

Mirror

Refracting Telescope

Reflecting Telescope

1 2 ... 40 41 42 43 44 45 46 47 48

Brak uwag

Meade-instruments DS-2000 Generation II Telescopes with LNT module Instrukcja Użytkownika Strona 45