Bresser Refractor 90 900 NG - Инструкция по эксплуатации - Страница 16

16

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

Part III – Appendix

1. Possible observation targets

The following section details several interesting and easy-to-find 
celestial objects you may want to observe through your telescope. 
The pictures at the end of the manual show what the objects will 
look like through your telescope's eyepiece.

The moon (No. 32)
The moon is Earth's only natural satellite.
Diameter: 3,476 

km

Distance: 

384,400 km from Earth (average)

The moon has been known to humans since prehistoric times. It is 
the second brightest object in the sky, after the sun. Because the 
moon circles the Earth once per month, the angle between the Earth, 
the moon and the sun is constantly changing; one sees this change 
in the phases of the moon. The time between two consecutive new 
moon phases is about 29.5 days (709 hours).

Constellation Orion: The Orion Nebula (M 42) (No. 33)
Right Ascension: 

05

h 

35

m

 (hours : minutes)

Declination: 

-05° 22' (Degrees : minutes)

Distance:  

1,344 light years from Earth

Though it is more than 1,344 light years from Earth, the Orion Nebula 
(M 42) is the brightest diffuse nebula in the sky. It is visible even with 
the naked eye and a worthwhile object for telescopes of all types 
and sizes. The nebula consists of a gigantic cloud of hydrogen gas 
with a diameter of hundreds of light years.

Constellation Lyra: The Ring Nebula (M 57) (No. 34)
Right Ascension:   18

h 

53

m

 (hours : minutes)

Declination:  

+33° 

02'

(Degrees : minutes)

Distance:  

2,412 light years from Earth

The famous Ring Nebula (M57) in the Lyra constellation is often 
viewed as the prototype of a planetary nebula. It is one of the mag-
nificent features of the Northern Hemisphere's summer sky. Recent 
studies have show that it is probably comprised of a ring (torus) of 
brightly shining material that surrounds the central star (only vis-
ible with larger telescopes), and not a gas structure in the form of a 
sphere or an ellipse. If you were to look at the Ring Nebula from the 
side, it would look like the Dumbbell Nebula (M 27). When viewed 
from Earth, we are looking directly at the pole of the nebula.

Constellation Vulpecula (Little Fox): 
The Dumbbell Nebula (M 27) (No. 35)
Right Ascension:   19

h

 59

m

 (hours : minutes)

Declination:   

+22° 43' (Degrees : minutes)

Distance: 

1,360 light years from Earth

The Dumbbell Nebula (M 27) was the first planetary nebula ever dis-
covered. On 12 July 1764, Charles Messier discovered this new and 
fascinating class of objects. We see this object almost directly from 
its equatorial plane. If we could see the Dumbbell Nebula from one 
of its poles, we would probably see the shape of a ring, something 
very similar to what we know as the Ring Nebula (M 57). In reason-
ably good weather, we can see this object well, even with low mag-
nification.

2. Troubleshooting:

Problem: Solution:

No picture 

Remove dust-protection cap and 

 sunbathe-shield from the objective 
opening.

Blurred picture 

 Adjust focus using focus ring.

No focus possible 

 Wait for temperature to balance out. 

Bad picture quality 

 Never observe through a glass  surface.

Viewing object visible 

Adjust finder

in the finder, but not 

(See Part I – 8: Construction).

through the telescope

Heaviness in the flexible 

Telescope and counter

handles on the axis 

weight are not balanced.

over the shaft

Despite using star  

The star diagonal prism

diagonal prism, 

should be vertical in 

the picture is  

the eyepiece connection. 

crooked

DISPOSAL

Dispose of the packaging materials properly, 
according to their type, such as paper or card-
board. Contact your local waste-disposal service 
or environmental authority for information on the 
proper disposal.

Please take the current legal regulations into 
account when disposing of your device. You 
can get more information on the proper disposal 
from your local waste-disposal service or envi-
ronmental authority.

Warranty and warranty term extension

The warranty term is two years from the date of purchase. Please keep 
your proof of purchase. Register at www.bresser.de/warranty and fi ll 
out a brief questionnaire to get your warranty term extended to fi ve 
years. Registration must be completed within three months of pur-
chase (date of receipt) to validate the warranty. If you register thereaf-
ter, the warranty term will not be extended. If you have problems with 
your device, please contact our customer service fi rst. Do not send 
any products without consulting us fi rst by telephone. Many problems 
with your device can be solved over the phone. If the problem cannot 
be resolved by phone, we will take care of transporting your device 
to be repaired. If the problem occurred after the warranty ended or it 
is not covered by our warranty terms, you will receive an estimate of 
repair costs, free of charge.

Service Hotline: +49 (0) 2872 - 80 74-210

Important for any returns: 
Please make sure to return the device carefully packed in the original 
packaging in order to prevent damage during transport. Also, please 
enclose your receipt for the device (or a copy) and a description of the 
defect. This warranty does not imply any restriction of your statutory 
rights.

Your dealer: ...........................................................................................

Art. No.: .................................................................................................

Description of problem: .........................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

Name: ....................................................................................................

Street: ....................................................................................................

City/Postcode: .......................................................................................

Telephone: .............................................................................................

Date of purchase: ..................................................................................

Signature: ..............................................................................................