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5. Using the accessories, a bit of math to
understand how all it works.

Using the accessories is easy and fun. To
change magnification simple swap eyepieces.
To get more magnification simply use the
barlow lens. But how all of this work?

5.1. Power (magnification)

Your telescope as a focal length of 300mm.
This is approximately the distance between
the telescope lens to its focal point (very
similar to the distance between the focus
point of a loupe and the loupe lens). This is a
very important feature that allows to
determine several interesting facts such as
magnification.

The magnification is determined by the
telescopes focal length and the used
eyepiece. You probably noticed that the two
supplied eyepieces are H20mm and H6mm.
This means that the H20mm is a 20mm focal
length eyepiece while the H6mm is a 6mm
focal length eyepiece.

To determine the magnification just devide
the telescope focal length by the eyepiece
focal length. Lets give an example for our
telescope and the supplied eyepieces:

Telescope focal length is 300mm
H20 eyepiece focal length is 20 mm

300𝑚𝑚

20𝑚𝑚

= 15 𝑝𝑜𝑤𝑒𝑟

This means that the H20 eyepiece provides a
15x power (magnification). This seems low but
try it, you will see a a bright image with some
very good detail.

5.2. Barlow Lens

The barlow lens is a very interesting device. It
is a negative lens that multiplies the
telescopes focal length. So a 2x Barlow
multiplies the original focal length by 2x, in
this case

300𝑚𝑚 𝑥 2 = 600𝑚𝑚

A 3x Barlow lens multiplies by 3x.
Your telescope is supplied with a 2x Barlow
lens. When used with the H20 eyepiece you
get 2x the power obtained before

15𝑝𝑜𝑤𝑒𝑟 𝑋 2𝑥 𝐵𝑎𝑟𝑙𝑜𝑤 = 30 𝑝𝑜𝑤𝑒𝑟

5.3. Erecting lens

The erecting lens gets you a upright image
view with the telescope. It also adds some
power like the barlow lens. The supplied
Erecting Lens provides and extra 1.5x power.

Here are some examples on how to use the
accessories.

Some possible accessory combinations

Terrestrial

View

Moon

Deep Sky

Jupiter and

Saturn

Erecting Eyepiece 1.5x

Yes

Barlow Lens 2x

Yes

H12.5 Eyepiece

Yes

H20 Eyepiece

Yes

H6 Eyepiece

Yes

Power

23x

48x

15x

100x

Содержание Cassini 76 DOB

Страница 1: ...1 Instruction Manual Cassini 76 DOB English version 8 2014 Rev A ...

Страница 2: ...he focuser The focuser moves up and down to get a precise focused image At the focuser one can use the supplied accessories Different accessories combinations give different results such as different image magnifications or correct image for example But all this will be explained in detail in the next pages 3 Assembly Your telescope comes fully assembled The tube and the dobsonian mount were assem...

Страница 3: ... page 5 If friction adjustment is required in the azimuth axis use a nut wrench not supplied to release or tighten the axis nut figure 3 Figure 2 Telescope pointing up at the zenith Figure 3 Adjust telescope movement on the central nut Figure 4 Hand knob to fix the telescope Figure 5 Insert the eyepiece in the focuser and tighten the side thumbscrew Figure 6 Erecting eyepiece for terrestrial view ...

Страница 4: ...nator between illumated and dark surfaces 4 2 Jupiter is the biggest planet of our solar system It is also on of the favorite targets for beginners Galileo was able to discover that the four tiny dots that turn around the planet were in fact part of Jupiters system of moons With this telescope you will be able not only to see Jupiter s planet disc with its two major discernible bands but also its ...

Страница 5: ... example for our telescope and the supplied eyepieces Telescope focal length is 300mm H20 eyepiece focal length is 20 mm 300𝑚𝑚 20𝑚𝑚 15 𝑝𝑜𝑤𝑒𝑟 This means that the H20 eyepiece provides a 15x power magnification This seems low but try it you will see a a bright image with some very good detail 5 2 Barlow Lens The barlow lens is a very interesting device It is a negative lens that multiplies the teles...

Страница 6: ...copes are compatible with all telescope eyepieces from different manufacturers as long as the eyepiece is a 1 25 or 31 75mm size eyepiece If you would like to test an eyepiece from a fellow astronomer go ahead Different eyepieces provide different visual experiences Q I want to use my telescope to take pictures A This telescope is designed for visual use It doesn t mean it can t be used for photog...

Страница 7: ...e for astronomical observing and when used outside at night Observing from inside the house or during the day is not usually possible The dust caps must first be removed and an eyepiece inserted before you can start observing Are you sure you have you removed all the dust caps not just the small ones If you have not then no light will enter the telescope and everything will appear black Annotation...

Страница 8: ...8 nimax Gmbh Otto Lilienthal Str 9 D 86899 Landsberg am Lech ...

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