Manual Bresser 9203810 Oxford 114-500 (page 6 of 36) (English, German, Dutch, French, Italian, Spanish)

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There is a simple formula for calculating the magnication:

Focal width of the telescope tube / Focal width of the eyepiece

= Magnication

The magnication also depends on the focal width of the telescope tube. The telescope has a focal length of

500 mm. From this formula, we see that if you use an eyepiece with a focal width of 20 mm, you will get the

following magnication:

500 mm / 20 mm = 25X magnication

The table below shows some common magnications.

Telescope tube

focal width

Focal width of eyepiece Magnication Magnication with

2X Barlow lens

500 mm 20 mm 25X 50X

500 mm 6 mm 83X 167X

NOTES on cleaning

• Clean the eyepieces and lenses only with a soft, lint-free cloth, like a microbre cloth. Do not apply excess

pressure to the cloth to avoid scratching the lenses.

• To remove more stubborn dirt, moisten the cleaning cloth with an eyeglass-cleaning solution, and wipe the

lenses gently.

• Protect the device from dust and moisture. After use, particularly in high humidity, let the device acclimatise

for a short period of time, so that the residual moisture can dissipate before storing. Remove the dust cover

and store it in the included bag during use.

• To remove dust on the mirrors, use a ne brush or air blower (from your local camera shop or optician). Don’t

touch any mirror surface with your ngers — they may damage the coating.

Telescope ABC:

What do the following terms mean?

Barlow Lens:

The Barlow lens was named after its inventor, Peter Barlow, a British mathematician and physicist who lived

from 1776–1862. The lens can be used to increase the focal width of a telescope. Depending on the type of

lens, it is possible to double or even to triple the focal width. As a result, the magnication can also be in-

creased. Also, see Eyepiece.

Focal width:

Everything that magnies an object via an optic (lens/mirror) has a certain focal width. The focal width is the

length of the path the light travels from the surface of the lens/mirror to its focal point. The focal point is also

referred to as the focus. In focus, the image is clear. In the case of a telescope, the focal widths of the telescope

tube and the eyepieces are combined.

Mirror:

The mirror bends the light which falls on it in such a way that the light creates a clear image at the focal point,

after it has traveled a certain distance (focal width).

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Bresser 9203810 Oxford 114-500 Manual

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