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battery-replacement information).

Mode Four:TIMER/FREQ

1. The TIMER Option

The TIMER menu option is for accurately timing different

observing or imaging tasks for up to 12 hours. The system

counts down to zero, in the hours, minutes, and seconds

format, and beeps to notify you that the time is up.

To set the TIMER, move the arrow to:

TIMER = 00:00:00

Press and hold the ENTER key to receive the double beep and

the blinking cursor. Enter the number of hours, minutes, and

seconds that you require. If you need to correct an error in

entry, use the E and W keys to move the blinking cursor; then

type the correct information. After entry, press the ENTER key

again; the cursor disappears. When you are ready to start your

time countdown, press the ENTER key once more. To pause

the countdown, press ENTER again, and then again to resume.

If you want an automatic 12-hour countdown, press and

release the ENTER key. Then press ENTER to start the

countdown.

2. The FREQ (Frequency) Option

The FREQ (Frequency) option lets you adjust the tracking

speed (not slew speed) of the LX200 digitally in tenths of a

Hertz, from 56.4 Hz to 60.1 Hz. You can match virtually every

celestial motion in the sky. Some popular drive rate settings

are:

There are three options in the FREQ menu. To see or set the

options, move the arrow to FREQ and press ENTER. At power-

up, the FREQ default is the 60.1Hz Q setting. The quartz rate

is precisely fixed and cannot be altered. To choose a different

rate, press the ENTER key to see 60.1M, and then again to see

60.1 M with the up and down arrow. These two menu file

options can adjust the tracking speeds.

Adjusting the Tracking Speed

Display 34 shows the manual rate menu file option that you can

adjust by pressing and holding the ENTER key to get the

double beep and the blinking cursor. Type in the new rate and

press the ENTER key again.

Display 34

Display 35 shows the menu file option that lets you step the

drive tracking frequency setting in tenths of a hertz, by using

the PREV and NEXT (up and down arrow) keys. This is a

convenient feature if you are trying to match the precise speed

of a planet, comet, or any other non-stellar object. To exit this

option, press the MODE key.

Display 35

Mode Five:

KEYPAD OFF/BRIGHTNESS ADJUST

In order to see very faint objects, you may need either to dim or

turn off the keypad red LCD backlighting. To do so press the

MODE key until the display goes blank. This is the OFF option.

To set the keypad brightness, press the ENTER key and adjust

the brightness with the PREV and NEXT keys. To exit, press

the MODE key.

This brightness setting also dims the power panel power LED

and ammeter.

NOTE:The backlighting is done by edge lighting a plastic light

bar underneath the keypad. Four LEDs are used and do not

give a perfectly even backlighting of the keys. Keys closer to a

LED are a little brighter than keys further away.

MAGNIFICATION AND FIELD OF VIEW

Magnification

The magnification (power) of the telescope depends on two

characteristics: the focal length of the main telescope and the

focal length of the eyepiece used during a particular

observation. For example, the focal length of the 16” LX200

f/10 telescope is fixed at 4064mm. To calculate the power in

use with a particular eyepiece, divide the focal length of the

eyepiece into the focal length of the main telescope.

Example: The power obtained with the LX200 with the

SP 26mm eyepiece is:

4064mm

Power =

________

= 156X

26mm

The type of eyepiece (MA for Modified Achromatic, PL for

Plössl, SP for Super Plössl, etc.) has no bearing on

magnifying power. It affects such optical characteristics as

field of view, flatness of field, and color correction.

The maximum practical magnification is determined by the

nature of the object being observed and especially by the

atmospheric conditions. Under very steady atmospheric

seeing conditions, the 16” LX200 may be used at powers up

to about 800X on astronomical objects. Generally, however,

lower powers, 300X to 400X, are required for high image

resolution. Under unsteady atmospheric conditions, as

witnessed by rapid twinkling of the stars, extremely high

power eyepieces result in empty magnification, where the

object detail observed is diminished by excessive power.

When you begin observing an object, start with a low-power

eyepiece. Get the object well centered in the field of view and

sharply focused. Then try the next step up in magnification. If

FREQ = 60.1 M

FREQ = 60.1M ◊

FREQ RATE DESCRIPTION NOTES

60.1 Hz Q Sidereal rate; Default rate at

Quartz setting power-up. Gives

sidereal frequency

accuracy to ±.005%;

Best for astrophotos

60.0 Hz Solar and Average rate for

planetary rate tracking planets;

Actual rates vary due

to retrogrades,

oppositions, etc.

57.9 Hz Lunar rate Best rate for

tracking the Moon

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 59 60

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