SKY-WATCHER MINI DOB 76 User manual

INSTRUCTION MANUAL

MINI DOB 76

190309V2

PARTS DIAGRAM

ASSEMBLY

Finderscope

Eyepiece

Focusing Wheel

Alt-Azimuth Base

Fig.a

Fig.b

1. Remove the telescope and

accessories from the package.

Locate finderscope optical assembly.

Remove the two knurled thumbscrews

near the opening of the telescope

main tube.

Position the finderscope bracket over

the screws in the telescope main body.

Secure the finderscope bracket with

the two knurled thumbscrews. (Fig.a)

4. Locate the eyepiece. Loosen the eyepiece

lock screws and slide the eyepiece into the

holder. Slightly tighten the screws to hold the

eyepiece in place. Do not over-tighten the

screws. (Fig.b)

OPERATING YOUR TELESCOPE

Fig.d

Focusing

Slowly turn the focus wheel (Fig.d),

one way or the other, until the image in

the eyepiece is sharp. The image

usually has to be finely refocused over

time, due to small variations caused by

temperature changes, flexures, etc.

This often happens with short focal

ratio telescopes, particularly when they

haven't yet reached outside

temperature. Refocusing is almost

always necessary when you change

an eyepiece or add or remove a

Barlow lens.

Positioning the telescope

To position the telescope to the

desired angle, simply move the

telescope tube up and down in

altitude or swivel the telescope

around the base in azimuth. (Fig.c)

Fig.e

Fig.c

Aligning the finderscope

These fixed magnification scopes

mounted on the optical tube are very

useful accessories. When they are

correctly aligned with the telescope,

objects can be quickly located and

brought to the centre of the field.

Alignment is best done outdoors in day

light when it's easier to locate objects.

If it is necessary to refocus your

finderscope, sight on an object that is

at least 500 yards (metres) away. Twist

the end of the finderscope until focus is

reached (Fig.e).

NEVER USE YOUR DOB TO

LOOK DIRECTLY AT THE SUN.

PERMANENT EYE DAMAGE

WILL RESULT.

Calculating the Magnification (Power)

magnification = = = 80X

Focal length of the telescope

Focal length of the eyepiece

800mm

10mm

The magnification produced by a telescope is determined by the focal length

of the eyepiece that is used with it. To determine a magnification for your

telescope, divide its focal length by the focal length of the eyepieces you are

going to use. For example, a 10mm focal length eyepiece will give 80X

magnification with an 800mm focal length telescope.

When you are looking at astronomical objects, you are looking through a

column of air that reaches to the edge of space and that column seldom stays

still. Similarly, when viewing over land you are often looking through heat

waves radiating from the ground, house, buildings, etc. Your telescope may

be able to give very high magnification but what you end up magnifying is all

the turbulence between the telescope and the subject. A good rule of thumb

is that the usable magnification of a telescope is about 2X per mm of aperture

under good conditions.

Cleaning your telescope

Replace the dust cap over end of telescope whenever not in use. This

prevents dust from settling on mirror or lens surface. Do not clean mirror or

lens unless you are familiar with optical surfaces. Clean finderscope and

eyepieces with special lens paper only. Eyepieces should be handled with

care, avoid touching optical surfaces.

Fig.f

Choose a distant object that is at

least 500 yards away and point the

main telescope at the object. Adjust

the telescope so that the object is in

the centre of the view in your

eyepiece.

Check the finderscope to see if the

object centred in the main telescope

view is centred on the crosshairs.

Use the three alignment screws to

centre the finderscope crosshairs

on the object (Fig.f).

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