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A User's Guide to the Meade LXD55 and LXD75 Telescopes von Peston, Martin (eBook)

  • Erscheinungsdatum: 28.04.2010
  • Verlag: Springer-Verlag
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A User's Guide to the Meade LXD55 and LXD75 Telescopes

This book offers a comprehensive introductory guide to 'choosing and using' a series LXD55 or LXD75 computer-controlled ('goto') telescope, containing a wealth of useful information for both beginners and more advanced practical amateur astronomers. The manufacturer's manuals are not nearly detailed enough to be of real help to beginners. No other book offers advanced techniques for more experienced LXD series users. Martin Peston obtained a first-class degree in Astrophysics at QM & Westfield, University of London. He currently works as a Systems Analyst and has been involved in various UK space and defence projects.

Produktinformationen

    Format: PDF
    Kopierschutz: AdobeDRM
    Seitenzahl: 256
    Erscheinungsdatum: 28.04.2010
    Sprache: Englisch
    ISBN: 9780387682648
    Verlag: Springer-Verlag
    Größe: 26377kBytes
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A User's Guide to the Meade LXD55 and LXD75 Telescopes

" CHAPTER TWELVE Gadgets and Gizmos (p. 195-196)

Introduction

No telescope is complete without accessories. There are many available for the LXD series of telescopes and in fact, not just produced by the original manufacturer (i.e. Meade). Many companies have taken it upon themselves to manufacture accessories that enhance the LXD telescope hardware. This chapter provides a general guide to accessories available for your LXDtelescope. The list is by no means exhaustive, and if you want to know more information about buying accessories for telescopes Star Ware by Phil Harrington is a book well worth reading.

Eyepieces

Purchasing an eyepiece is just as important as buying a telescope. The best quality eyepieces tend to be very expensive, some costing more than a quarter of the initial outlay of the telescope. The quality of an image does not solely depend upon the quality of the telescope optics , but also on the quality and type of eyepiece used. Eyepieces come in various types and sizes, ranging from simple designs with a few internal elements to those with a complex array ofelements. The magnification and exit pupil properties depend upon focal length and design type . These are discussed in Chapter 7.

One of the most popular types of eyepieces used by astronomers is the Plossl, It consists of four elements, and is a good all round general purpose eyepiece. The 26 mm eyepiece supplied with every LXD telescope is of Plossl design. A short time ago Meade produced a set of Plossl eyepieces to celebrate their 50th Anniversary. The anniversary kit contains the complete set of Meade Series 4000 Plossl eyepieces ranging from the low power wide field 40 mm eyepiece to the high power 6.4 mm eyepiece (Figure 12.1). The 4000 series has been recently superseded by the superior 5000 series.

Other common types of eyepieces include Kellner, Orthoscopic, Nagler and Zoom. The Kellner eyepiece consists of three elemen ts, has good eye relief and is best used at low to moderate magnifications. They have typical focal lengths of between 40 to 20mm. The Orthoscopic eyepiece consists of four elements and provides excellent sharpness and colour contrast, so are ideal for luna r and planetary work but has a smaller field of view compared to other designs. A disadvantage of orthoscopic eyepieces is that focal lengths 8 mm or smaller, provide pinhole eye relief which hinders viewing of the image.

The Or thoscopic eyepiece design has been superseded with superior, more complex designs which offer wide-field and excellent eye relief for relatively short focal lengths. An example is the Televue Radian eyepiece (Figure 12.2). Zoom eyepieces combine several focal lengths into a single eyepiece design. This is like using several eyepieces at once, altho ugh images tend to be slightly dimmer than fixed focal length eyepieces, due to the large amount of optical elements attenuating the light from the image."

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