INSTRUCTION MANUAL ESPRIT 100 ED Super APO SL131203 Copyright © Sky-Watcher 1
Table of contents Table of Contents Introduction ........................................................................................................................................ 2 Getting started ................................................................................................................................... 3 Parts description ..................................................................................................................................
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.
Getting started Parts description 1. 2. 3. 4. 5. 6. 7. Retractable dew cap Tube rings D (Losmandy) dovetail bar 9x50 erect-image 90° finder scope 3" 1:11 dual-speed focuser 2" dielectric diagonal 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 retracted. 2.
Preparing the telescope for an observation A. Upon delivery, and when not used, the telescope and its accessories are inside the aluminum padded case. Before installing the telescope on a mount the tube rings must be assembled on the D (Losmandy style) dovetail bar with four screws, as shown in picture. Open the two rings and place the assembly on a flat surface or directly on the mount with the rings open. B. Inside the box, the dew cap of the instrument is fully retracted (1).
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.
Using the telescope for visual observation • 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 retightening the screw (3).
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 100 Field flattener has been specifically designed for your telescope.
In order to get the premium results the field flattener for ESPRIT 100 can deliver the distance between the last lenses to the sensor should be exactly 63mm. This distance is called the field flattener "back focus". The rings are designed to provide 63mm 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 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). The custom ring needs to be sturdy enough to secure the optical train to the field flattener. 4. 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).
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. Using the indexed scale The indexed scale on the focuser drawtube gives an accurate indication on the focus position for various accessories.
Specifications Telescope specifications Optical Design Field Flattener Aperture (mm) Focal Length Focal Ratio Finderscope Diagonal Tube Rings Highest Useful Magnification Lowest Useful Magnification Limiting Stellar Magnitude Resolution (Rayleigh) Resolution (Dawes) Light Gathering Power (Compared to Human Eye) Optical Coatings Fully Illuminated Field With Field Flattener Optical Tube Length (Retracted Dew Cap) Optical Tube Weight Telescope Visual Backfocus ∗ Field Flattener Backfocus ** Refractor (air-spa
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.
