Tele Vue NP101is - Manual (Page 10)

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5.0 ADDITIONAL ACCESSORIES
5.1 All Tele Vue telescopes with rack and pinion focusers now permit the photographer to index focus position
to within 0.00005” by means of a digital indicator. Mounting points are provided on top of the focuser
body and end of the draw tube for easy installation of the various Digital Indicator Kits. Using the Digital
Indicator provides a convenient way of finding best focus, returning to it, or checking that it hasn’t changed.
Choose either the 10 Micron (0.0004”) Indicator Kit (LMK-2404) or the 1 micron Indicator Kit (LMF-
2405) depending on the accuracy desired. Both indicators have 0.5” motion ranges and accept an
RS-232 output cable for displaying readout on computer. The 10 foot long RS-232 Output Cable (RSC-
2320) permits remote indicator readout on computer screen via downloadable software from the Tele Vue
website (www.TeleVue.com). The cable also provides power to the indicator.
5.2 The Focusmate Driver for the NP101is (FDF-2004) electronically drives the fine focus knob of the 10:1
Focusmate in steps of approximately 0.0005” per button click. With the button depressed, the motor
drives the Focusmate continuously without vibration transferred to the system. Motor speed is variable.
The motor has a standard phone jack that will accept a cord of any length. Remote control is possible.
Contact Tele Vue for further details.
6.0 Caring for your NP101is
Tele Vue-NP101is requires no special care. Treat it as you would any fine camera lens. Use the lens cap
when the telescope is being stored or not in use. The captive dew shield provides protection from glare,
helps protect the lens from dust or spray blown in by the wind and minimizes dew formation on the lens.
If dew forms on the lens during cold weather, it is best to use a hair dryer (on the lowest setting) to
gently warm it away. A few specks of dust will have no effect on image quality and may be gently blown
off with a squeeze bulb. Do not use compressed air cans to blow dust off optical surfaces.
To prevent dew formation when bringing the scope in from the cold, we advise to close the cold
scope in its case before bringing it into the warm indoors. Do not open the case until the scope has come
up to room temperature.
Fingerprints or oils should be cleaned off the lens surface. Though the anti-reflection coatings are
durable, they can be scratched. The simplest cleaning method is to moisten a very soft, lint-free tissue,
cloth, “Q-Tip” or surgical cotton with a lens or glass cleaner and working in a circular motion, gently whisk
away the stain. Do not apply any solutions directly to the glass surfaces. After every cleaning stroke, use
a fresh applicator. The fewer strokes the better! Any residual “film” will not affect visual performance.
Collimation of your Tele Vue-NP101is has been locked at the factory. With reasonable care it will
remain aligned. However, rough handling can cause misalignment. WARNING: The button head screws
in the front lens cell are filled with epoxy. Loosening these screws will cause misalignment. If necessary,
contact Tele Vue for re-collimation.
Your star diagonal employs a first-surface mirror. Like all first-surface mirrors, it should be cleaned
only when absolutely necessary. First blow loose dust away with a squeeze bulb. CAUTION: Do not
clean mirror with water or water based cleaners such as Windex or any other commercial lens cleaners;
this is not a lens. All contain too much water and will leave stains. Moisten a “Q-Tip” with pure acetone,
methanol or Isopropyl alcohol, reagent grade. Clean gently using only the weight of the cotton swab.
Use light pressure and never rub. Slight residual stains or dust have no visible effects in observing.
The tube is powder-coated for durability and can be waxed with any nonabrasive car wax. Black
anodized surfaces can be cleaned with Windex. If you have any questions about the care, operation or
performance of your Tele Vue-NP101is, please call us at (845) 469-4551 from 9:30 am to 5:00 pm EST.