SKY-WATCHER ESPRIT 80 ED Super APO User manual

INSTRUCTION MANUAL

ESPRIT 80 ED Super APO

SL131204

Table of contents

Table of Contents

Introduction........................................................................................................................................ 2

Getting started................................................................................................................................... 3

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

Unpacking the telescope...................................................................................................................... 3

Preparing the telescope for an observation.......................................................................................... 4

Cooling the telescope .......................................................................................................................... 4

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

Using the telescope for visual observation............................................................................ 6

Inserting the eyepiece.......................................................................................................................... 6

Focusing.............................................................................................................................................. 6

Using the telescope for prime focus imaging....................................................................... 7

Installing the field flattener and a DSLR (Digital Single-Lens Reflex) camera.................................. 7

Installing the field flattener and a CCD (Charge-Coupled Device) camera........................................ 8

Installing the field flattener and a CCD camera - continued............................................................... 9

Focusing.............................................................................................................................................. 9

Framing the picture ............................................................................................................................. 9

Useful tips for all observations................................................................................................ 10

Removing the finder scope................................................................................................................ 10

Using the indexed scale..................................................................................................................... 10

Rotating the focuser........................................................................................................................... 10

Specifications.................................................................................................................................. 11

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

Threads specifications....................................................................................................................... 11

Introduction

The spirit of perfection, by Sky-Watcher

Designed with the discerning astronomer in mind, Sky-Watcher top-of-the-line Esprit refractors

deliver the kind of imaging performance one would expect from telescopes costing much more. With

their three-element air spaced objective lens design, false color is completely eliminated, yielding

exceptional contrast and sharpness.

The 2.7" CNC machined 1:11 rotatable dual speed linear power focuser provides a smooth, rock-solid

focusing with zero image shifts. The Esprit ED 80mm refractor comes with a 9 x 50 right angle finder

scope, 2-inch Star diagonal, EQ5 (Vixen-style) dovetail, eyepiece and padded case. Everything you

need to get out under the stars.

The 2-element thread-on 48mm field flattener guarantees excellent field flatness across the entire 33

mm imaging plane. Its oversized lenses ensure a larger and clearer aperture and also extremely

minimized halation.

Quick overview:

•80 mm apochromatic, 3-element refractor

•400 mm (f/5)

•Metallic high-transmission lens coatings

•2.7" CNC machined 1:11 dual-speed focuser

•Zero color fringing even on bright objects

•33 mm image circle

•Knife-edge Baffled Optical System

•2" Diagonal with dielectric coatings

•9x50 erect-image 90° finder scope

•EQ5 dovetail (Vixen style) bar

•Aluminum foam lined case

•Thread-on field flattener

•APS-C corrected focal plane

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.

Getting started

Parts description

1. Dew cap

2. EQ5 (Vixen) dovetail bar

3. 9x50 erect-image 90° finder scope

4. 2.7" 1:11 dual-speed focuser

5. 2" dielectric diagonal

6. 2" eyepiece f= 28mm

Unpacking the telescope

Your telescope is inside the sturdy aluminum padded case, designed to

securely carry the telescope and the tube rings.

The case contains and protects the telescope and its accessories. Once

open you will find:

1. The telescope with dew cap

and EQ5

(Vixen style) dovetail bar.

2. The 9x50 erect-

image finder scope with

tube rings and mount.

3. The 2" (50.8mm) diagonal.

4. The 2-element thread-on field flattener

(used for photography only), guarantees

excellent field flatness across

the entire

33mm imaging plane, allowing picturing the

sky with large sensors.

Note: A ring spacer of 6mm is attached to

the field flattener body. Its usage will be

discussed on page 7 and 8.

5. 2" eyepiece, f= 28mm.

6. Thread-on field flattener

adaptor, used to

install the field flattener

on the focuser's

drawtube.

Some parts may be optional,

depending on the dealer's country.

Please check with him if any doubt.

Preparing the telescope for an observation

Upon delivery, and when not used, the

telescope and its accessories are inside the

aluminum padded case.

Unpack the

instrument…

B. The instrument is ready to be placed on

the mount, via the EQ5 (Vixen style)

dovetail bar

. Please refer to your mount

manual for proper and secure installation.

C. The 9x50 erect-image 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 into the field

of telescope (see also "Aligning the finder

scope" chapter, on next page)

install the finder scope on the telescope

insert the positive dovetail of the finder

scope support inside the negative dovetail

mounted on the focuser, as shown in

picture.

Cooling the telescope

Telescopes require time to cool down to outside air temperature. This may take longer if there is a big

difference between the temperature of the telescope and the outside air. This minimizes heat wave

distortion inside telescope tube (tube currents). Your telescope would require at least 15 minutes

cooling off to outside conditions. Tip: use this time for planning your session and mount accessories.

Aligning the finder scope

The 9x50 erect-image 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, sight on an object that is

at least 500 meters (or yards) away. Loosen the locking ring by

unscrewing it back towards the bracket. The front lens holder can now

be turned in and out to focus. When focus is reached, lock it in position

with the locking ring

Choose a distant object that is at least 500 meters (or yards) away and

point the main telescope at the object. Adjust the telescope so that the

object is in the center of the view in your eyepiece.

If you are using the star diagonal the image will be left/right

inverted, like images in a mirror.

Having an erected image, the view you have in the finder

scope has the same orientation as the landscape.

Check the finder scope to see if the object, centered in the

main telescope view, is centered on the crosshairs.

If not

unscrew the three blocking rings on the rear ring, then adjust

the three small screws to center the finder scope.

Do not over tighten the screws

when aligning the finder

scope. When the finder scope is correctly oriented, screw the

three blocking rings in position.

Using the telescope for visual observation

Inserting the eyepiece

•Loosen the two thumbscrews (1)

on the end of the focuser tube.

•Insert the 2" diagonal (2) into the

focus tube and re-

tighten the

thumbscrews (1)

to hold the

diagonal in place.

•Loosen the diagonal's screw (3).

•For 2" eyepieces (4a)

, insert it

into the diagonal and secure it by

re-tightening the thumbscrew (3).

•

For 1.25" eyepieces first insert

the 2" to 1.25" adapter (4b) into

the diagonal and secure by re-

tightening the screw (3). Loosen

the adapter's screw (5) and insert

the 1.25" eyepiece (6) inside the

adapter ring, then secure it by re-

tightening the screw (5).

Focusing

•Make sure the locking lever below the focuser (1) is

unlocked (position as shown in picture).

•Slowly turn the focus knobs (2) one way or the other,

until the image in the eyepiece is nearly sharp.

•To finely focus the image turn the 1:11 knob one way or

the other until the image is perfectly sharp (3).

•Lock the screw below the focuser (1) if a heavy load is

attached (pull the lever at 90°).

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.

When looking through a diagonal, the image

is inverted left to right, as an image in a

mirror. This is normal and has no incidence

for astronomical observations.

If you plan to do terrestrial observation often, like bird

watching, optional image-erecting devices such as the

Amici prism or the erected 90° diagonal may be the right

tool.

Your reseller will be glad to advise you about the best

optional part that can be used with your telescope.

Using the telescope for prime focus imaging

Before installing the field flattener

onto the drawtube of the

focuser, the 2" ring adaptor (2)

needs to be unscrewed and

removed.

In order to easily unscrew the ring, hold with one hand the ring (1)

at the end of the drawtube and then unscrew the 2" ring adaptor

(2) with the other hand.

The Sky-Watcher ESPRIT 80 Field flattener

has been specifically designed for your

telescope. It guarantees excellent field flatness across the entire 33

mm imaging plane

and ensures full illumination with extremely minimized halation and zero color fringing

even on bright objects.

No "universal" field flattener available on the market will deliver the premium results

achieved with the Sky-Watcher ESPRIT 80 Field flattener which is designed

exclusively for this telescope.

Installing the field flattener and a DSLR (Digital Single-Lens Reflex) camera

Note: Inside the box the 6mm ring spacer (3) is assembled with the field flattener body (2). When

assembled, the two parts may look as if there were only one piece. When taking pictures with a DSLR

camera it should stay assembled.

1. Screw the drawtube adaptor (1) at

the end of the focus tube.

Screw the field flattener (2) onto the

drawtube adaptor (1).

If not yet done, screw the extender

tube (3) onto the field flattener (2).

Screw the enlarged 48mm T-Ring

(4) onto the extender tube (3).

The enlarged 48mm T-Ring

may not be included with

your telescope and should

match your DSLR camera's

manufacturer and model.

Please check with your

reseller to get the correct

48mm Enlarged T-Ring for

your DSLR camera.

Install your DSLR camera on the

48mm enlarged T-Ring (4).

In order to get the premium results the field flattener for

ESPRIT 8

0 can deliver the distance between the last

lenses to the sensor should be exactly 61

mm. This

distance is called the field flattener "back focus".

The rings are designed to provide 61mm of back focus

with any DSLR camera. Modifications to this layout, i.e.

by adding a radial guider, will lead to blurry stars images

in the field edges.

Installing the field flattener and a CCD (Charge-Coupled Device) camera

Installing an astronomical CCD camera and its accessories (filter wheel, radial guider…) behind the

field flattener is not as straightforward as installing a DSLR camera. All DSLR cameras have the exact

same distance from the front side of the T-Ring adapter to the sensor, thus share the same extension

rings to ensure the 61mm back focus distance.

CCD cameras differ from one model to another, even in the same brand name, by the threads used and

the body-to-sensor distance. Accessories also have different possible threads and depths, thus the

combination of a CCD camera and its accessories can have any total length and any coupling thread.

A custom coupling ring is needed in order to assemble the CCD camera and its accessories (called the

"optical train") to the telescope's field flattener. The custom ring should be machined*to have:

1) A female M62x1 thread, to screw and secure the ring to the field flattener exit.

2) A thread compatible with the first component of the optical train.

3) A length to ensure that the distance from the back of the field flattener to the CCD sensor is

exactly 61mm.

Note: Inside the box the 6mm ring spacer is

assembled with the field flattener body. When

assembled, the two parts may look as if there were

only one piece. When taking pictures with a CCD

camera it can be useful to remove the 6mm spacer

ring to gain 6mm additional back focus distance

The 61mm distance is measured from the edge

marking the start of the male thread on the field

flattener, to the CCD sensor (See picture on the

left).

Most CCD cameras have also the distance from

their body thread to CCD sensor noted in the

manual, thus evaluating the length of the custom

ring you need can be precisely evaluated.

*Refer to your local dealer about custom ring supply.

Installing the field flattener and a CCD camera - continued

Screw the drawtube adaptor (1) at the

end of the focus tube.

Screw the field flattener (2) onto the

drawtube adaptor (1).

Screw the custom ring (3) onto the

field flattener (2).

The custom ring needs to be

sturdy enough to secure the

optical train to the field

flattener.

Screw your optical train to the custom

ring (3).

Focusing

•Make sure the locking lever below the focuser (1) is

unlocked (position as shown in picture).

•Slowly turn the focus knobs (2) one way or the other,

until the image in the eyepiece is nearly sharp.

•To finely focus the image turn the 1:11 knob one way or

the other until the image is perfectly sharp (3).

•Lock the screw below the focuser (1) if a heavy load is

attached (pull the lever at 90°).

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.

Framing the picture

When the object you want to picture is in the middle of the circular 33mm field, most often its

orientation on the rectangular camera APS-C sensor is not what you expected (figure A). You can

easily reframe the picture on the camera sensor by unscrewing the blocking ring (1) at the end of the

focuser drawtube, then turning the adapter ring (2) with all the optical train until the framing suits your

needs (figure B). When done screw the ring (1) to lock position, and you are ready to picture the sky.

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