SKY-WATCHER Quattro-200 ST Manuale utente

Quattro 200 ST & CF Newtonian Astrograph

INSTRUCTION MANUAL

QT200-F-140618V1-EN

CONTENT

Part I : Introduction

Sky-Watcher Quattro-200 ST: Sky at Night magazine group test winner scoring 89%....... 2

Part II: Getting Started

Parts description................................................................................................................ 3

Assembling the finder scope.............................................................................................. 3

Frequently Asked Questions about the packaging............................................................. 4

Doesn’t an astrograph deserve a better box than just a simple cardboard box?................. 4

No eyepiece is provided with my telescope. Is it normal? .................................................. 4

Why is no coma corrector proposed as standard?............................................................. 4

What does Sky-Watcher propose for the Quattro series as accessories?.......................... 4

Aligning the finder scope.................................................................................................... 5

Part III: Basic Operations

Using an eyepiece............................................................................................................. 6

Using the 42x0.75mm ring (T2 ring)................................................................................... 6

Using an accessory with specific connections.................................................................... 6

Focusing............................................................................................................................ 7

Part IV: Advanced Operations

Offset and collimation ........................................................................................................ 8

Focuser parallelism............................................................................................................ 9

Balancing the tube with a heavy image train...................................................................... 9

Part V : Specifications

Telescope specifications...................................................................................................11

Part I: Introduction

Part I : Introduction

Sky-Watcher Quattro-200 ST: Sky at Night magazine group test

winner scoring 89%

The superb Skywatcher Quattro-200 ST telescope OTA has beaten all the

opposition to win best in class in the November 2011 Sky at Night

magazine.

The most acclaimed feature of the Quattro 200

astrograph is the knife-edge baffle system. The

Quattro's tube is lined with a set of nine internal baffle

rings. Their main purpose is to cut down on stray light

entering the telescope tube, greatly helping to

improve image contrast.

The Quattro is fitted with a Crayford-style focuser with

tension adjustment, focus-lock and a 10:1 dual-speed

fine focusing, and also comes with a 2-inch fitting that

has a T-thread on its external side. This allows a

sturdy connection to be made between scope and

camera with the right adaptor ring.

The primary and secondary mirrors are made of Low

Expansion Borosilicate Glass, for near zero thermal

expansion.

The impressive 0.5 mm Ultra-Thin secondary mirror

vanes ensure minimal thermal accumulation and

reaches thermal equilibrium in no time.

The secondary mirror support is mounted offset, for

perfect optical collimation.

Optimized for astrophotography, with its baffle system and parabolic primary optics with a

very fast f/4 focal ratio, the Quattro 200 is designed for exceptional wide-field, deep-space

imaging performance. Even faint galaxies and nebulas exhibit stunning detail with limited

exposure time when photographed with a CCD imager or DSLR camera.

The Quattro 200 is proposed with two options for the tube: Standard Tube (ST series) and

Carbon Fiber (CF series) for astrophotographers dealing with long to very long exposure

times. The Carbon Fiber series can remain in focus for a longer period of time and long

exposure images will stay clear and in focus.

NEVER USE YOUR TELESCOPE TO LOOK DIRECTLY AT THE

SUN. PERMANENT EYE DAMAGE WILL RESULT.

NEVER USE AN EYEPIECE-TYPE SOLAR FILTER.

NEVER USE YOUR TELESCOPE TO PROJECT SUNLIGHT ONTO

ANOTHER SURFACE; THE INTERNAL HEAT BUILD-UP WILL

DAMAGE THE TELESCOPE OPTICAL ELEMENTS.

USE A PROPER SOLAR FILTER FIRMLY MOUNTED ON THE

FRONT OF THE TELESCOPE FOR VIEWING THE SUN.

WHEN OBSERVING THE SUN, PLACE A DUST CAP OVER

YOUR FINDERSCOPE OR REMOVE IT TO PROTECT YOU

FROM ACCIDENTAL EXPOSURE.

NEVER LET A TELESCOPE POINTING THE SUN UNATTENDED.

Part II: Getting Started

Parts description

When unpacking the box, you will find the following parts enclosed:

1. The main tube

2. 1 1/4 inch screwed on 42mm T2 adapter (left part (see Fig.2 page 6)) and 2 inch eyepiece

adapter (right part), to insert into the focuser's drawtube.

3. Finder bracket and 8x50 finder scope, with centering O-ring attached to the bracket.

4. Protective cap for the 1:10 speed reduction’s knob.

Assembling the finder scope

1. Carefully remove the rubber O-ring from the finder scope bracket. Position the O-ring into

the groove on the finder scope tube.

2. Loosen the two adjusting screws on the bracket. Position the finder scope into its bracket

by sliding it backwards until the rubber O-ring seats. The chrome button on the finder

bracket contains a spring. When inserting the finder scope in the bracket, pull the chrome

button.

Slide the finder scope bracket into the mounting slot on the telescope and tighten the screw

to hold the bracket in place

Part II: Getting Started

Frequently Asked Questions about the packaging:

Doesn’t an astrograph deserve a better box than just a simple cardboard box?

Yes, indeed. But when we asked seasoned astrophotographers what type of box should be

the best for a Newtonian astrograph, the answer was always the same: “Only a box I choose

specifically for my equipment will do the job”.

Because every astrophotographer we met has his own choice of camera, filter set, accessory

plate or even car trunk dimension we decide to let the customer free to choose what will be

the best fit instead of asking added money for a nice box which a vast majority will find

unpractical or even totally useless.

No eyepiece is provided with my telescope. Is it normal?

As the Quattro series are fast Newtonian astrograph we were unsure what can be the best

eyepiece to provide. Seasoned astrophotographers use different eyepieces for different

purposes: a standard low magnification eyepiece to check if the object is inside the field of

view, a high magnification eyepiece to observe Moon details and planets, and many more

usages were evoked.

Many astrophotographers already have eyepieces at hand so we decide to let any standard

eyepiece out of the box and to not ask money for an accessory most customers already have

at hand.

Why is no coma corrector proposed as standard?

A high quality coma corrector (see next paragraph) is an essential accessory for widefield

astrophotograpy. But the Quattro series can also offer nice visual images without coma

corrector.

Again we decide to let the coma corrector out of the box and let the customer decide what

will be the best fit.

What does Sky-Watcher propose for the Quattro series as accessories?

If you are looking for a great eyepiece to use with your telescope or other compatible

accessories, like the F4 Coma Corrector (4 lenses, enlarged T2 thread), we advise you to

ask your reseller or visit the Sky-Watcher sites at www.skywatcher.com or

ca.skywatcher.com for further inquiries.

Part II: Getting Started

Aligning the finder scope

The 8x50 finder scope is a small fixed magnification scope mounted on the optical tube.

When it is correctly aligned with the telescope, objects can be quickly located and brought to

the center of the field.

The alignment should be done at first use and over time if the alignment is no more accurate.

Alignment is best done outdoors in day light when it's easier to locate objects

If it is necessary to refocus your finder scope, look at

an object that is at least 500 meters (or yards) away.

Loosen the knurled ring by unscrewing it back

towards the bracket. The front lens holder can now

be turned in and out of focus. When focus is reached,

lock it in position with the knurled ring (Fig. 1).

NEVER LOOK DIRECTLY AT THE SUN WITH

THE FINDER SCOPE.IT COULD IMPAIR

DEFINITIVELY YOUR VISION.

When the finder scope is in focus, choose a distant object that is at least 500 meters (or

yards) away and point the main telescope at the object. Center the object in the eyepiece of

the telescope by aiming precisely at the distant object.

Now, check in the finder scope to see if that distant

object is exactly positioned behind the crosshairs of

the finder scope's eyepiece. If not, adjust the

alignment of the finder scope with the two black

adjusting screws on the bracket of the finder scope

(Fig. 2).

Do not over tighten the screws when aligning the

finder scope.

The image in the finder scope is upside-down. This is normal and has no

incidence on observations.

Part III: Basic Operations

Using an eyepiece

1. Loosen the two thumbscrews on the focuser’s

drawtube [Fig 1.1].

2. Insert the 11/4 inches or 2 inches adapter

inside the focuser’ drawtube. Tighten the two

screws at the end of the focuser’s drawtube

[Fig 1.1], and unscrew the two thumbscrews

on the adapter [Fig 1.2a]or [Fig 1.2b].

3. Insert the eyepiece into the adapter [Fig 1.3a]

or [Fig 1.3b]and tighten the adapter’s

thumbscrews [Fig 1.2a]or [Fig 1.2b]

Using the 42x0.75mm ring (T2 ring)

The 11/4 inches adapter is composed of two parts:

an 11/4 inches tube [Fig 2.1] screwed on a T2

(42x0.75mm) plate [Fig 2.2].

To access the T2 ‘(42x0.75mm) plate [Fig 2.2]

simply unscrew the 11/4 inches tube [Fig 2.1]form

the 11/4 inches adapter.

Reassembling the 11/4 inches adapter can easily

be done by following the preceding steps in

reverse order.

1. Assemble the T2 plate with your T2 accessory

adapter [Fig 3.1].

2. Loosen the two thumbscrews on the focuser’s

drawtube [Fig 3.2].

3. Insert the T2 plate with your T2 accessory

adapter inside the focuser’s drawtube [Fig

3.3]. Tighten the two screws at the end of the

focuser’s drawtube [Fig 3.2].

4. Assemble your accessory onto the T2

accessory adapter [Fig 3.4].

Using an accessory with specific connections

[Fig. 4].Some accessories don’t need a standard

adapter to be connected to the telescope, like the

Sky-Watcher F4 Coma Corrector.

In this case please follow indications given with

the accessory for proper and secure connection.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Part III: Basic Operations

Focusing

1. Make sure the locking screw [Fig 5.1] is loose.

2. Slowly turn the focus knobs [Fig 5.2]one way or the other,

until the image in the eyepiece is nearly sharp.

3. To finely focus the image turn the 1:10 knob one way or the

other until the image is perfectly sharp [Fig 5.3].

4. Tighten the locking screw [Fig 5.1]if a heavy load is

attached.

The image usually has to be finely refocused over time, due to

small variations caused by temperature changes. This often

happens when the telescope has not yet reached outside

temperature.

Refocusing is almost always necessary when you change an

eyepiece or accessory.

Fig. 5

Part IV: Advanced Operations

Offset and collimation

The secondary mirror of the Quatto 200 is

already positioned “full offset”.

In a fast Newtonian like the Quattro, the center of

the secondary mirror doesn’t correspond to the

axis of the cone of light reflected by the primary

mirror. To intercept the light cone properly, the

secondary mirror has to be positioned “offset”

from its center, as shown in [Fig. 1].

The offset of the spider vanes with the center

of the secondary mirror will be visible when

looking into the telescope by the focuser's

side. This is normal and should be taken in

account when doing a collimation.

Mirrors inside the telescope have been carefully aligned to each other in the factory. When

using the telescope, this alignment should be checked to ensure optimal image quality.

When looking at a bright star, the star image given by your telescope should be symmetrical,

a central dot with diffraction rings centered on this white dot (see Fig 2). Be patient to

consider the average shape of the star image while the image is slowly moving due to air

turbulence (see Fig 3).

If the star image appears to be unsymmetrical (see Fig 4) a

recollimation is needed. Therefore, the blocking screws of

the primary mirror on the back of the telescope should be

loosened [Fig. 5.1]and the big adjustment knobs will then

allow realigning the primary mirror to obtain a symmetric star

image again [Fig. 5.2]. These adjustments should be small.

After adjusting, by tightening the blocking screws, you can

lock the primary mirror in its aligned position.

When misalignment is heavy, an alignment of the secondary

mirror should be done also. In that case, it is recommended

to use an optional laser collimator. This laser collimator

greatly helps in determining the misalignment of each mirror.

Fig. 1

Fig. 5

Part IV: Advanced Operations

Focuser parallelism

Since the Quattro Newtonian telescope is very well suited

for wide field photography, the focuser of this telescope is

equipped with adjustment screws for alignment of the

focuser to the optical axis of the telescope. Misalignment

can be detected in the edge of wide field pictures when

the stars in the 4 edges look different. The stars in the

edges may show some coma if the optional coma

corrector is not correcting all of the coma aberration in the

image edge of a very big size CCD, but this aberration

should be symmetric (all pointing to the center of the

image). If not, realigning the focuser with the push pull

screws ([Fig. 6 A and B]) may be needed.

FINE TUNING THE FOCUSER PARALLELISM IS A

DELICATE OPERATION.PLEASE CAREFULLY CHECK

FOR OTHER CAUSES BEFORE ATTEMPTING THIS

PROCEDURE.

Balancing the tube with a heavy image train

In Newtonian reflectors the secondary mirror intercepts the

light and points it out the side of the tube at right angles to

the tube through the eyepiece.

This configuration allows positioning the eyepiece in a

comfortable viewing angle, mainly parallel to the ground or

elevated some degrees when the target is low on horizon.

When using an accessory in the focuser, like an eyepiece,

the tube is not in perfect balance due to the added weight of

the eyepiece on one side of the tube. It has no real

importance when the accessory is light, the mount can

easily support such imbalance.

When using a heavy imaging train, containing a heavy CCD

camera, a radial guider, a filter wheel and maybe an adaptive

optic system the imbalance can become a real problem.

A neat solution to this imbalance problem is to put all the

imaging train vertically, oriented to the ground, as shown in

[Fig. 7].

IN THIS CONFIGURATION GRAVITY IS YOUR ENEMY!BE

CAREFUL TO PROPERLY SECURE YOUR ACCESSORIES

TO THE FOCUSER!

Fig. 6

Fig. 7

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