Meade Instruments LX850 - Manual (Page 36)

be accessed directly using the Number keys (commonly
referred to as “hot buttons”). The two functions, the
Speed mode and the Utility light are described earlier
in the manual.
Focus Control Menus: If you have installed the
Meade Zero Image Shift Micro Focuser, Press Number
key “4” to select these menus directly from Autostar II’s
keypad. Each time you press Focus, the key toggles
between focus/focus speed menus. When “Focuser:
Fast” displays, press the Up or Down Scroll keys to
select a focus speed (fast, medium, slow or fine).
When “Focuser: Position” displays, use the Up or
Down Arrow keys to achieve fine focus of the object.
StarLock Control Menu:
• StarLock On/Off: Selecting this entry allows
you to turn StarLock on or off. You may wish to
disable StarLock if you imaging a planet, or using a
alternative autoguiding system.
• StarLock Status: When you select this option, the
handbox will display the real-time guide corrections
being made by the StarLock. The corrections are
expressed in arcseconds. Pressing MODE will
return you to the regular menus.
• Guide Rate: This option allows you to control how
aggressively the StarLock attempts to remove
tracking errors. This value is typically about 66 to
75%. When seeing is good higher values produce
best results. In poor seeing this number should be
reduced so that you scope does not “chase seeing”
resulting in poor tracking.
• StarLock HPP: This option allows you to turn
StarLock high precision pointing on and off.
• StarLock HPP Dome Delay: After the telescope
slews to, aligns on an object and begins guiding
there will be a delay to allow the dome to move to
the new OTA location.
AutoStar #497 HANDBOX
AutoStar II Operation
36
StarLock Permanent Periodic
Error Correction
StarLock will automatically perform the PEC feature on
your mount. To use this feature, simply press ENTER.
It takes about 7 minutes to train one cycle.
It is advised that you perform one training and then
immediately follow-up with two updates for maximum
Periodic Error Correction. The level of training is
necessary for critical applications such as long
exposure photography.
Periodic Error Correction is retained within AutoStar's
memory until you overwrite it by performing additional
training cycles.