FIG. 7: Layout of optional equipment, as should appear from top of telescope's main tube.
Tube Balance Weight System: Occasionally, if the Model DS-10 telescope is fitted with several accessory
options (e.g. viewfinder, deluxe focuser, guide telescope, and/or 35mm camera body), auxiliary balancing may
be advisable. The tube balance weight system consists of a small sliding weight attached to a rod which in turn
is fixed to the lower end of the main telescope tube. (See Figs. 6 and 7.)
Balancing of Optional Accessories: In lieu of a tube balance eight system, note that balance weights of your
own devising may be easily added to the rear surface of the primary mirror cell. A simple piece of angle iron or
scrap metal may be used for this purpose. Any auxiliary weight of this sort added to the telescope should be
firmly fixed to the mirror cell (whether by screws, nails, or other fasteners), so that the weight will not fall off
as the telescope is moved about the sky.
Dual-Axis Drive Corrector, Model 47M: The Dual-Axis-Drive Corrector for the DS-10 is the identical unit
offered for Meade 6" and 8" reflecting telescopes. This drive corrector permits simultaneous electronic
corrections in both right ascension and declination, for proper tracking during long exposure astro-
photography. Detailed instructions for attaching the Dual-Axis Drive Corrector to the DS-10 are supplied with
the drive corrector itself.
Barlow Lenses: A Barlow lens doubles or triples the effective magnifying-power that an eyepiece yields when
used alone. The Meade #112 22X Telenegative Amplifier is well-suited to the applications of the DS-10. With
most eyepieces, insert the eyepiece extender tube into the focuser first, followed by the Barlow lens, followed
by an eyepiece.
NOTE: We do not normally recommend the use of the Meade #123 3X Telenegative Amplifier or #127 2X-3X
Variable Telenegative-Amplifier on the DS-10. While these Barlows perform very well optically, they are not
well-suited to the extender tube that must be used with most eyepieces on the DS-10.
Eyepieces: The DS-10 is supplied as standard equipment with a Kellner 25mm eyepiece yielding 46X. Many
other eyepieces are available for higher or lower powers. For deep-space applications, the Meade Research-
Grade Erfle 20mm eyepiece is probably the best choice obtainable; for lunar and planetary observations,
eyepieces in the 4mm to 12.5mm range are advisable, for use both with and without a Barlow lens.
NOTE: Because the DS-10 has been designed for such a wide range of visual and photographic applications, it
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