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
ES120-F-141120V2-EN
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 ES120-F-141120V2-EN 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 ..............Error! Bookmark not defined. Preparing the telescope for an observation ..................3 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 completely eliminated, yielding exceptional contrast and sharpness.

  • Page 4: Getting Started

    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 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 (note: the case may be different from the picture, depending on your dealer’s country). Unpack telescope and assemble it to your mount using the included D (Losmandy style) dovetail bar.

  • 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  Loosen the two thumbscrews (1) Inserting the eyepiece 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.

  • Page 8: Using The Telescope For Prime Focus Imaging

    2" ring adaptor (2) with the other hand. The Sky-Watcher ESPRIT 120 Field flattener has been specifically designed for your telescope. It guarantees excellent field flatness across the entire 44 mm imaging plane and ensures full illumination with extremely minimized halation and zero color fringing even on bright objects.

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

    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 75mm. 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: Installing The Field Flattener And A Ccd Camera - Continued

    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: 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 12: Specifications

    Specifications Telescope specifications Optical Design Refractor (air-spaced triplet APO) Field Flattener Thread-on (2 lenses) Aperture (mm) 120 mm (4.72 in) Focal Length 840 mm (33 in) Focal Ratio Finderscope 9x50, erect-image, right-angle Diagonal 2" dielectric coatings Tube Rings With 3" (D Style) dovetail plate Highest Useful Magnification 283 x Lowest Useful Magnification...

  • Page 13: Different Releases: The Helinear Focuser

    Different releases: The Helinear Focuser Some of the first ESPRIT 120 series were delivered with a different focuser: the Helinear focuser. Focusing with the Helinear focuser  Unlock the locking screw below the focuser (1).  Slowly turn the focus knobs (2) one way or the other, until the image on the eyepiece or the camera sensor is nearly sharp.
  • Page 14 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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S11420

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