SKY-WATCHER ESPRIT 120 ED Super APO Instruction Manual
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SKY-WATCHER ESPRIT 120 ED Super APO Instruction Manual

SKY-WATCHER ESPRIT 120 ED Super APO Instruction Manual

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INSTRUCTION MANUAL
ESPRIT 120 ED Super APO
SL301113
Copyright © Sky-Watcher
1

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Summary of Contents for SKY-WATCHER ESPRIT 120 ED Super APO

  • Page 1 INSTRUCTION MANUAL ESPRIT 120 ED Super APO SL301113 Copyright © Sky-Watcher...

  • Page 2: Table Of Contents

    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 ................

  • Page 3: Introduction

    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 extremely well corrected, yielding exceptional contrast and sharpness.

  • Page 4: Getting Started

    Getting started Parts description 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.

  • Page 5: Preparing The Telescope For An Observation

    Preparing the telescope for an observation A. Upon delivery, and when not used, the telescope and its accessories are inside the aluminum padded case. Unpack 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.

  • Page 6: Aligning The Finder Scope

    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.

  • Page 7: Using The Telescope For Visual Observation

    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).

  • Page 8: Prime Focus Imaging With The Optional Field Flattener

    No "universal" field flattener available on the market will deliver the premium results achieved with the Sky-Watcher ESPRIT 120 Field flattener. The Sky-Watcher ESPRIT 120 Field flattener is not compatible with other telescopes, even refractors with the same aperture and same focal length.

  • Page 9: Installing A 48Mm Filter Inside The Extender Tube

    In order to get the premium results the field flattener for ESPRIT 120 can deliver the distance between the last lenses to the sensor should be exactly as designed for. This distance is called the field flattener "back focus". The rings are designed to provide 75mm of back focus with any DSLR camera.

  • Page 10: Focusing

    Installing the field flattener and a CCD camera - continued 1. Screw the drawtube adaptor (1) at the end of the focus tube. 2. Screw the field flattener (2) onto the drawtube adaptor (1). 3. Screw the custom ring (3) onto the field flattener (2).

  • Page 11: Prime Focus Imaging With The Optional 0.77X Reducer / Flattener

    2" ring adaptor (2) with the other hand. The Sky-Watcher ESPRIT 120 full frame 0.77x reducer / field flattener has been specifi- cally designed for your telescope. It guarantees excellent field flatness and ensures full illumination with extremely minimized color fringing across the entire 34 mm imaging plane.

  • Page 12: Installing The Reducer Flattener And A Ccd Camera

    95mm In order to get the premium results the reducer flattener for ESPRIT 120 can deliver the distance between the last lenses to the sensor should be exactly 95mm. This distance is called the reducer flattener "back focus". The rings are designed to provide 95mm of back focus with any DSLR camera.
  • Page 13 Installing the field flattener and a CCD camera - continued 1. Screw the reducer flattener on the end of the focus tube. 2. Screw the custom ring onto the field flattener. 3. Screw your optical train to the custom ring. The custom ring needs to be sturdy enough to secure the optical...

  • Page 14: Useful Tips For All Observations

    Useful tips for all observations Removing the finder scope During an observation, when the desired target is acquired, it is possible to remove the finder scope from its support. When needed the finder scope can be inserted again. This can be useful when the observer's head is in a position where the finder scope becomes an obstacle to observation.

  • Page 15: Specifications

    Specifications Telescope specifications Refractor (air-spaced triplet APO ) Optical Design Aperture (mm) 120 mm (4.7 in ) Focal Length 840 mm (33 in ) Focal Radio Highest Useful Magnification 283 x Lowest Useful Magnification 17 x Limiting Stellar Magnitude 12.9 1.16 arc seconds Resolution (Rayleigh) 0.97 arc seconds...
  • Page 16 Threads specifications Field flattener and DSLR adapter threads specifications Rings/ Focuser Drawtube Field DSLR Enlarged Threads Tube Adatpor Flattener Ext. Tube T-Ring Ø M74x1 F. M65x1 F. M62x1 F. M48x0.75 F. In screw depth 7 mm 7.5 mm 8.5 mm variable Ø...

  • Page 17: Different Releases: Case

    Please check with him if any doubt. Sky-Watcher offers this product with the best available quality in accordance with the legislation of the local market. This can lead to small differences over time and depending on the area of sale in the world. These differences do not influence the overall quality which is of the high standard guaranteed by Sky-Watcher worldwide.
  • Page 20 We want to ensure that your experience with a Sky-Watcher product is the best it can be. To make that happen we have a comprehensive technical and customer support available, alongside with the list of distributors and dealers worldwide, on our worldwide internet site: http://www.skywatcher.com...

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