Meade MEADE 226W Manuel utilisateur

OPERATING

INSTRUCTIONS

MEADE®

MODEL

226W

2.4"

(60MM)

ALTAZIMUTH

REFRACTING

TELESCOPE

Meade

Instruments

Corporation

1675

Toronto

Way

•

Costa

Mesa,

California

•

92626

•

(714)

556-2291

WARNING:

NEVER

POINTTHETELESCOPE

DIRECTLY

ATOR

NEAR

THE

SUN

ANY

TIME!

OBSERVING

THE

SUN,

EVEN

FOR

THE

SMALLEST

FRACTION

SECOND

MAY

RESULT

INSTANT

AND

IRREVERSIBLE

EYE

DAMAGE,

WELL

PHYSICAL

DAMAGE

THE

TELESCOPE

ITSELF.

TABLE

CONTENTS

Introduction

Standard

Equipment

Unpacking

and

Assembly

Aligning

the

Viewfinder

Using

the

Telescope

Calculating

Power

Maintenance

Specifications

Optional

Accessories

(Meade

Model

226W

similar

illustration

above)

FIG.

Meade

Model

226W

2.4"

Altazimuth

Refracting

Telescope

Eyepiece

10.

Altazimuth

mount

Viewfinder

11.

Tripod

attachment

bolts

Viewfinder

collimation

screws

12.

Focusing

knob

Optical

tube

assembly

13.

Diagonal

mirror

Vertical

lock

knobs

14.

Objective

lens

cell

Horizontal

lock

knob

15.

Focuser

drawtube

Tripod

leg

16.

Altitude

rod

slow

motion

fine

adjustment

control

Accessory

tray

supports

17.

Altitude

rod

coarse

adjustment

lock

knob

control

Accessory

Tray

INTRODUCTION

This

manual

details

the

set-up,

operation,

specifications

and

optional

accessories

the

Meade

Model

226W

2.4”

(60mm)

Altazimuth

Refracting

Telescope.

The

Model

226W

easy

operate,

high

performance

telescope

designed

for

both

astronomical

and

terrestrial

observing.

order

that

you

may

achieve

maximum

utilization

the

instalment,

urge

that

you

take

few

minutes

read

all

this

manual

before

making

first

observations

through

the

telescope.

you

read

through

this

manual,

the

technical

terms

associated

with

telescopes

will

made

clear.

STANDARD

EQUIPMENT:

(Refer

Fig.

•

Complete

optical

tube

assembly

(objective

lens

diameter

60mm

(2.4");

focal

length

700mm)

•

Full-length

fully

adjustable

hardwood

tripod

and

accessory

tray.

•

Kellner

25mm

(28X),

and

9mm

kellner

(77x)

Eyepieces

(.965"

O.D.

“Outside

Diameter")

•

Diagonal

mirror

(.965"

O.D.)

•

5x24mm

viewfinder

with

bracket

•

Altazimuth

mount

with

altitude

slow-motion

control.

•

Hardware

package:

bolts

(3"

long)

with

wing

nuts

and

washers

screws

(1/2"

long)

with

wing

nuts

All

other

necessary

hardware

provided

place.

UNPACKING

AND

ASSEMBLY

(Note:

Numbers

()

refer

Fig.

Note

that

although

the

telescope

unassembled,

all

the

difficult

complicated

sections

the

instrument

are

already

factory

pre-assembled;

first

time

assembly

the

telescope

should

not

require

than

about

minutes.

set

the

telescope,

this

procedure:

Remove

and

identify

the

telescope’s

components,

using

the

listing

above.

The

optical

tube

may

need

adjusted

horizontal

position

for

easier

assembly:

loosen

the

altitude

lock

knob

(17)

and

reposition

the

optical

tube

provide

easy

access

the

mount

for

attachment

the

tripod

legs

(7).

Attach

the

hardwood

tripod

legs

(7)

the

base

the

altazimuth

mount

(10)

with

the

hinged

accessory

tray

supports

(8)

facing

inward.

Three

bolts

(11),

each

about

long,

with

washers

and

wing

nuts,

are

provided

for

this

purpose

the

end

the

legs

that

attach

the

mount.

Attach

the

accessory

tray

(9)

the

tray

supports

with

the

short

screws

and

wing

nuts

provided.

Adjust

the

sliding

tripod

legs

the

desired

height

loosening

the

thumb

screw

the

bottom

the

unextended

leg;

then

reposition

the

sliding

center

portion

the

leg

desired

height

and

firmly

retighten

the

thumb

screw

secure

the

leg(s).

Attach

the

viewfinder

bracket

(2)

the

telescope

using

the

thumbscrews

provided.

(During

shipment,

these

thumbscrews

may

pre-threaded

into

the

main

telescope

tube

the

viewfinder

location).

The

thumbscrews

fit

through

holes

located

the

base

the

viewfinder

bracket

and

thread

into

the

main

tube.

insert

the

diagonal

prism

(13)

into

the

focuser

drawtube

(15)

and

the

Ke25mm

eyepiece

(1)

into

the

diagonal

mirror.

Secure

each

place

with

moderate

tightening

the

respective

thumbscrews.

the

eyepiece

that

determines

the

power

which

the

telescope

operating.

Higher

lower

power

eyepieces

are

available

suit

particular

observing

situations.

The

Ke25mm

eyepiece,

included

standard

equipment,

yields

power

(written

28X)

with

the

Model

226W.

The

telescope

now

completely

assembled.

move

the

telescope

and

point

from

one

object

another,

first

slightly

loosen

one

the

chrome-look

(star

shaped)

knobs

(5)

which

serves

vertical

lock,

well

the

azimuth

(horizonal)

lock

(6).

Also

loosen

the

altitude

coarse

adjustment

lock

knob

(17).

Loosening

these

locks

allows

the

telescope

turned

freely

(vertically

and/or

horizontally)

any

direction

that

the

telescope

can

moved

locate

and

point

object.

Once

sky

object

found

the

altitude

coarse

adjustment

lock

knob

(17)

can

tightened

and

the

altitude

slow

motion

fine

adjustment

control

knob

(16)

can

then

used

effect

very

smooth

and

accurate

tracking

the

vertical

axis.

ALIGNING

THE

VIEWFINDER

The

5x24mm

viewfinder

permits

easy

object

sighting

prior

observation

the

higher-power

main

telescope.

align

the

viewfinder,

this

procedure:

With

the

Kellner

25mm

eyepiece

place

the

diagonal

prism,

described

paragraph

point

the

main

telescope

some

well

defined

land

target

(e.g.

the

top

telephone

pole)

least

200

yards

distant.

Look

through

the

viewfinder

and

tighten

loosen,

appropriate,

the

viewfinder’s

collimation

(alignment)

screws

located

the

back

the

finderscope

bracket

(3),

until

the

cross

hairs

the

viewfinder

are

precisely

centered

the

same

object

already

centered

the

main

instrument’s

field

view.

With

this

alignment

accomplished,

objects

located

first

the

wide-field

viewfinder

will

then

centered

the

main

telescope’s

field

view.

(Note:

The

viewfinder

presents

image

which

upside-down

and

reversed;

this

customary

all

astronomical

viewfinders).

Focusing

the

viewfinder’s

image

accomplished

turning

the

threaded

eyepiece

the

viewfinder.

USING

THE

TELESCOPE

With

the

telescope

assembled

described

above,

you

are

ready

begin

observations.

First

decide

easy

find

object.

Land

objects

during

the

daytime

are

good

way

become

accustomed

the

functions

and

operations

the

telescope.

night,

try

observing

the

Moon

first,

visible,

bright

star.

center

object

the

main

telescope,

use

the

viewfinder

first

sight

the

object

you

wish

observe.

Always

use

the

lower

power

Kellner

25mm

(28X)

eyepiece

find

and

center

object.

Then

switch

higher

power

eyepiece

such

the

Kellner

9mm

(77X)

provided

standard

equipment.

(For

other

eyepieces,

see

OPTIONAL

ACCESORIES,

page

7).

The

Kellner

25mm

eyepiece

included

with

the

Model

226W

presents

wide

field

view,

ideal

for

terrestrial

observing

for

the

observation

star

fields

and

star

clusters.

you

are

observing

astronomical

object

(the

Moon,

planet,

star,

etc.)

you

will

immediately

notice

that

the

object

rather

slow

but

continuous

motion

through

the

telescopic

field

view.

This

motion

caused

the

rotation

the

Earth

its

axis

which

results

apparent

motion

the

object

the

telescope’s

field

view;

i.e.

although

the

Moon,

planets

and

stars

are,

for

practical

purposes,

fixed

their

positions

during

any

hour

observing

session,

the

platform

which

the

telescope

sitting

(the

Earth)

rotates

once

every

hours

underneath

these

fixed

objects.

keep

astronomical

objects

centered

the

field,

simply

move

the

telescope

one

both

its

axes

(vertical

and/or

horizontal)

appropriate.

The

altitude

slow

motion

fine

adjustment

control

will

allow

for

very

smooth

incremental

verticle

movements;

sure

the

altitude

coarse

adjustment

lock

knob

has

been

tightened

before

using

the

fine

adjustment

control

knob.

You

will

notice

higher

powers,

astronomical

objects

will

seem

move

through

the

field

rapidly.

Avoid

touching

the

eyepiece

while

observing

through

the

telescope.

Vibrations

resulting

from

such

contact

will

cause

the

image

move.

Allow

few

minutes

for

your

eye

become

“dark

adapted”

before

attempting

serious

astronomical

observations.

Avoid

setting

the

telescope

inside

room

and

observing

through

open

window

(or

worse

yet,

closed

window).

Images

viewed

such

manner

may

appear

blurred

distorted

due

temperature

differences

between

inside

and

outside

air.

repeat

the

warning

stated

the

outset

this

manual:

NEVER

POINT

THE

TELESCOPE

DIRECTLY

NEAR

THE

SUN

ANY

TIME!

OBSERVING

THE

SUN,

EVEN

FOR

THE

SMALLEST

FRACTION

SECOND,

MAY

RESULT

INSTANT

AND

IRREVERSIBLE

EYE

DAMAGE,

WELL

PHYSICAL

DAMAGE

THE

TELESCOPE

ITSELF.

The

Meade

Model

226W

may

used

for

lifetime

rewarding

astronomical

and

terrestrial

observing,

but

basic

your

enjoyment

the

telescope

good

understanding

the

instrument.

Read

the

above

instructions

carefully

until

you

understand

all

the

telescope’s

parts

and

functions.

One

two

observing

sessions

will

serve

clarify

these

points

forever

your

mind.

The

number

fascinating

objects

visible

through

your

Meade

refractor

limited

only

your

own

motivation.

Obtain

good

star

atlas

(see

‘‘Meade

Star

Charts”

OPTIONAL

ACCESSORIES,

page

and

read

the

listings

objects

visible

through

60mm

(2.4")

telescopes.

These

objects

include:

•

Cloud

belts

across

the

surface

the

planet

Jupiter.

•

The

major

moon’s

Jupiter,

visible

around

the

planet

.changing

position

each

night.

•

Saturn

and

its

famous

ring

system.

•

The

Moon:

veritable

treasury

craters,

mountain

ranges

and

fault

lines.

•

Deep-Space:

Nebulae,

galaxies,

multiple

star

systems,

star

clusters—hundreds

such

objects

are

visible

through

the

Model

226W.

•

Terrestrial

objects:

Your

Meade

telescope

may

also

used

for

high

resolution

land

viewing.

this

case,

note

that

the

diagonal

prism

results

image

which

reversed

left-for-right,

but

which

correctly

oriented

up-and-down.

For

fully

corrected

image,

the

#927

45°

Erect

Image

Roof

Prism

(.965”

O.D.)

required.

See

“OPTIONAL

ACCESSORIES”,

page

Terrestrial

observations

should

almost

always

made

using

low

power

eyepiece

(50X

less)

for

bright,

sharp

images.

Land

objects

will

not

normally

higher

powers

well

because

the

telescope

being

pointed

through

the

thickest

part

the

Earth’s

atmosphere,

unlike

astronomical

observations

made

pointing

the

telescope

and

through

the

atmosphere.

CALCULATING

POWER

The

power,

magnification,

which

telescope

operating

determined

two

factors:

the

optical,

focal

length

the

telescope's

main

(objective)

lens

and

the

focal

length

the

eyepiece

being

used.

The

focal

length

the

Model

226W’s

objective

lens

700mm.

compute

power,

divide

the

focal

length

the

eyepiece

into

the

focal

length

the

objective

lens.

The

resulting

quotient

the

magnifying

power

the

telescope

when

used

with

the

eyepiece

question.

For

example,

the

Kellner

25mm

eyepiece

yields

with

the

Model

226W,

power

of:

Power

700mm

25mm

Similarly,

the

Kellner

9mm

eyepiece

used,

the

resulting

power

will

700mm

9mm

77X.

The

letter

“Ke”

refers

the

“Kellner”

optical

design

(3-element)

which

yields

very

well

corrected

images

with

refracting

telescopes

and

generally

preferred

over

the

common

Huygens,

“H”,

(2-element)

because

its

higher

quality

and

better

eyerelief

for

comfortable

viewing.

The

optical

design

the

eyepiece

has

bearing

power,

however.

The

Meade

Series

Orthoscopic

eyepieces

(4-element)

described

“OPTIONAL

ACCESSORES”

page

this

manual

present

extremely

sharp,

well

resolved

images

through

the

Model

226W

throughout

wide

range

magnifications.

few

words

wisdom

about

power.

Why

not

1000

power

more?

Meade

serious

telescope

manufacture

known

for

quality

and

honest

marketing.

The

theoretical

power

magnification

with

telescope

virtually

limitless.

However,

there

are

practical

limits

imposed

the

earth’s

atmosphere

and

optical

resolution

what

can

seen

well

given

power.

The

most

often

useful

higher

magnification

with

any

60mm

diameter

telescope

the

range

120

power.

The

general

rule

use

with

any

telescope,

regardless

size:

Only

use

much

power

good

image

supports:

this

often

varies

with

the

stability

the

air

being

viewed

through

and

one

reason

why

having

various

eyepieces

useful.

Higher

powers

are

guaranty

better

images,

fact

the

opposite

often

true.

Meade

has

attempted

maximize

the

performance

your

telescope

for

the

most

useful

power

range

provide

the

greatest

possible

utility

and

enjoyment.

MAINTENANCE

with

any

quality

optical

instrument,

lens

surfaces

should

cleaned

infrequently

possible.

little

dust

the

surface

the

objective

lens

causes

negligible

degradation

image

quality

and

should

not

considered

reason

“clean"

the

lens.

When

lens

cleaning

does

become

necessary,

use

camel's

hair

brush

compressed

air

gently

remove

dust.

Wipe

only

with

soft,

clean

cloth,

applying

little

pressure

possible

avoid

scratching

glass

surfaces.

SPECIFICATIONS

700mm

60mm

(2.4”)

f/11.7

Altazimuth

Objective

(main)

lens

focal

length

Objective

lens

diameter

Focal

ratio

Mounting

type

OPTIONAL

ACCESSORIES

See

your

Meade

dealer

for

further

details

any

these

accessories.

#927

45°

Erect-Image

Roof

Prism

(.965"

O.D.):

Correctly

orients

the

telescopic

image

during

terrestrial

observing

and

yields

image

position

45°

angle

the

main

telescope

tube,

resulting

comfortable

observing

position

most

cases.

Additional

Eyepieces

(.965"

O.D.):

The

Meade

Series

eyepieces

listed

below

present

extremely

sharp,

highly

resolved

images

the

Model

226W

throughout

wide

range

magnifications.

Each

eyepiece

shown

with

its

optical

type

(OR

Orthoscopic;

MA(Ke)

Modified

Achromatic(Kellner)

and

the

power

obtained

when

used

with

the

Model

226W

telescope:

Eyepiece

Power

When

Used

OR4mm

175X

OR6mm

117X

OR9mm

78X

OR18mm

39X

OR25mm

28X

MA40mm*

18X

Model

226W

‘The

MA40mm

eyepiece

excellent

low-power,

wide

field

ocular,

highly

recommended

for

terrestrial

applications

for

observing

large

star

fields.

Meade

Star

Charts:

Bound

12"

14"

charts

printed

heavy,

coated

paper,

suitable

for

field

use.

Includes

listings

and

mapped

locations

hundreds

interesting

deep

space

objects

for

observation

through

the

telescope.

CALL

FOR

FREE

FULL-LINE

MEADE

CATALOG

714-556-2291

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