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Telescope ABC’s

What do the following terms mean?

Diagonal:

A mirror that deflects rays of light 90 degrees. With a horizontal 

telescope tube, this device deflects the light upwards so that you can 

comfortably observe by looking downwards into the eyepiece. The 

image in a diagonal mirror appears upright, but rotated around its 

vertical axis (mirror image).

Focal Length:

 

Everything that magnifies an object via an optic lens has a certain focal 

length (FL). The FL is the length of the path the light travels from the 

surface of the lens to its focal point. The focal point is also referred to 

as the focus. In focus, the image is clear. In a telescope, the FL of the 

telescope tube and the eyepieces are combined. 

Lens:

 

The lens turns the light which falls on it around in such a way so that 

the light gives a clear image in the focal point after it has traveled a 

certain distance (focal length).

Eyepiece:

 

An eyepiece is a system made for your eye and comprised of one or 

more lenses. In an eyepiece, the clear image that is generated in the 

focal point of a lens is captured and magnified even more. 

There is a simple formula for calculating the magnification:

focal length of the telescope tube / focal length of the eyepiece = 

magnification

In a telescope, the magnification depends on both the focal length of 

the telescope tube and the focal length of the eyepiece. 

Magnification: 

The magnification corresponds to the difference between observation 

with the naked eye and observation through a magnification apparatus 

such as a telescope. In this formula, observation with the eye is 

considered “single,” or 1x magnification. Accordingly, if a telescope 

has a magnification of 30x, then an object viewed through the 

telescope will appear 30 times larger than it would with the naked eye.

Troubleshooting:

Problem: 

 Solution:

No picture

 

  

Remove dust protection cap 

 

 

and sun-shield from the    

 

  

objective opening.

Blurred picture

 

  

Adjust focus using focus     

 ring.

No focus possible

 

  

Wait for temperature to 

 

 

balance out.

Bad quality

 

  

Never observe through a 

 

 

glass  surface such as a 

 

 window.

Viewing object visible

 

 

Align finder to telescope

in the finder, but not 

through the telescope

Despite using star 

 

 

The star diagonal prism

diagonal prism

 

 

should be vertical in 

the picture is “crooked”

 

 

the eyepiece connection. 

DISPOSAL

Dispose of the packaging materials properly, 

according to their type (paper, cardboard, etc). 

Contact your local waste disposal service or 

environmental authority for information on the 

proper disposal.

 The Red Dot Viewfinder is 

powered by a battery type 

CR-2032 (3V);  if a replacement is 

necessary, remove cap (Fig. 1) by 

unscrewing set screw (Fig. 2) and 

sliding battery towards the front.  

Slide new battery in place with the 

positive (+) side showing.  Replace 

cap and tighten with 

set screw (Fig. 2).

Fig. 1

Fig. 2

Front

Red Dot Viewfinder

(bottom view)

El Visor Red Dot es

impulsado por un tipo de batería 

CR-2032 (3V); si un reemplazo es 

necesario, retire la tapa (fig. 1), 

desenroscando el tornillo de ajuste 

(fig. 2) y la batería de deslizamiento 

hacia la parte delantera. Deslice la 

pila en el lugar con la positiva 

proyección lateral (+). Reemplace 

la tapa y apriete con

el tornillo de 

fijación (fig. 2).

fig. 1

fig. 2

frente

Red Dot visor

(vista desde abajo)

English

Le Dot Viseur rouge est

alimenté par une batterie de type 

CR-2032 (3V), si un remplacement 

est nécessaire, enlever le bouchon 

(Fig. 1) en dévissant la vis de 

réglage (Fig. 2) et la batterie de 

glissement vers l'avant. Glisser la 

nouvelle pile en place avec la 

borne positive (+) côté montrant. 

Remettre le bouchon et 

le serrer avec

la vis de 

pression 

(Fig. 2).

Fig. 1

Fig. 2

de devant

Red Dot Viseur

(vue de dessous)

French

Spanish

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