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INSTRUCTION MANUAL
ESPRIT 150 ED Super APO
Copyright © Sky-Watcher
SL131119
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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 a 48mm filter inside the focal extender ............................................................................... 8
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
Different releases : Case and Accessory box....................................................................... 12
Different releases: The Helinear Focuser ............................................................................ 13
Focusing with the Helinear focuser ................................................................................................... 13
Before doing prime focus imaging .................................................................................................... 13
Framing a picture with the Helinear focuser ..................................................................................... 13
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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 3" CNC machined 1:11 rotatable dual speed linear power focuser provides a smooth, rock-solid
focusing with zero image shifts. The Esprit ED 150mm refractor comes with a 9 x 50 right angle
finder scope, 2-inch Star diagonal, D-style dovetail, retractable dew cap 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 44
mm imaging plane. Its oversized lenses ensure a larger and clearer aperture and also extremely
minimized halation.
Quick overview:
• 150 mm apochromatic, 3-element refractor
• 1050 mm (f/7)
• Metallic high-transm issio n lens coa ting s
• 3" CNC machined 1:11 dual-speed focuser
• Zero color fringing even on bright objects
• 44 mm image circle
• Knife-edge Baffled Optical System
• 2" Diagonal with dielectric coatings
• 9x50 erect-image 90° finder scope
• Tube rings with dovetail D (Losmandy style) bar
• Aluminum foam lined case
• Full frame corrected focal plane
• Thread-on field flattener
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 BUILDUP 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.
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Getting started
Parts descript ion
1. Retractable dew cap
2. Tube rings
3. D (Losmandy) dovetail bar
4. 9x50 erect-image 90° finder
scope
5. 3" 1:11 dual-speed focuser
6. 2" dielectric diagonal
7. 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 has two castors on one side to
facilitate transport.
The case contains and protects the telescope and its accessories. Once open you will find:
1. The telescope with dew cap retracted.
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 44 mm imaging
plane, allowing picturing the sky wit h
large sensors.
5. Fie ld flatt ener extender tube for DSLR
camera, used to place the camera
exactly on the corrected focal plane.
6. 2" eyepiece, f= 28mm.
7. 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.
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Preparing the telescope for an obs erv a ti on
A
. Upon delivery, and when not used, the
telescope and its accessories are inside the
aluminum padded
case. Unpack the
telescope
and assemble it to your mount
using the included D (Losmandy style)
dovetail bar. Please refer to your mount
manual to properly install the telescope.
B. To extend the dew cap unscrew the two
screws on the aluminum ring (1)
, then
gentle pull the dew cap forward (2). When
in position, tighten
the two screws to
ensure the dew cap stays in position (3).
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)
To
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 30 minutes
cooling off to outside conditions. Tip: use this time for planning your session and mount accessories.
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