Tele Vue NP127is - Manual (Page 8)

8
5.0 Imaging System Focus 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. Mount-
ing 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 NP127is (FDF-2004) electronically drives the fine focus knob of the
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.
5.3 The Tele Vue Imaging System comes full circle when you add the Focusmaster (FMU-2319) to your
system. The Focusmaster is the communication gate way for the Digital Indicator Kit and the Focusmate
Driver to become a “closed-loop” focusing system with your camera and camera control software. Con-
verge focus quickly on the base of the “V” curve to within a micron when using our 1-micron indicator...
you just can’t do this by hand!
6.0 Caring for your NP127is
The Tele Vue-NP127is 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.
Fingerprints, however should be cleaned off. Though the anti-reflection coatings are durable, they are
easily scratched. The simplest cleaning method is to moisten (not soak) a very soft, lint-free tissue, cloth,
“Q-Tip” or surgical cotton with a lens or glass cleaner and 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-NP127is has been locked at the factory. With reasonable care it will
remain aligned. However, rough handling can cause misalignment. WARNING: Do not loosen the but-
ton head screws in the front or rear lens cells as this will cause misalignment. If necessary, contact Tele
Vue for re-collimation.
The tube is powder-coated for durability and requires no special care. Black anodized surfaces can
be cleaned with Windex. If you have any questions about the care, operation or performance of your
Tele Vue-NP127is, please call us at (845) 469-4551 from 9:30 am to 5:00 pm EST.