Vixen AP Equatorial Mount Instruction Manual page 50

APPLICATION
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Press the Mount button to make the direction keys available. Confirm
the amount of backlash in the direction of RA.
Center the star in the field of view of your eyepiece and watch how
the star moves while pressing the left direction key. Keep pressing the
direction key until the star begins to move.
Next, press the right direction key to watch how the star moves in the
field of view.
If there is a time lag and the star does not begin to move instantly to-
ward the direction you press, a value for backlash compensation is set
too small (weak) or set to "0".
On the contrary, if the star begins to move quickly and largely at the
same time you press, a value for backlash compensation is set too big
(strong).
7
Confirm the amount of backlash in the direction of DEC in the same way using the left and right keys.
Tips on Backlash Compensation Setting
Watch how the telescope moves when you increase the value. Start with setting an initial reference value (10 for example), and dou-
ble this value after checking the telescope movement with the initial value. If the second value (= 20) is too small to compensate for
the backlash, enter the number doubled (= 40) as the second value. Likewise increase the number by doubling the value if necessary.
Example: Enter 20 for the backlash compensation.
If this value is too small for the compensation, increase the value to 40. If it generates too much compensation as a result, decrease
to the value halfway between 20 and 40. If the value of 30 is still somewhat bigger for the compensation, decrease to 25. On the
contrary, if 30 is somewhat small, increase to 35. In this way you can adjust the mount for the most effective backlash compensation.
Backlash compensation is not compatible with an autoguider in most cases. Set the values to "0" in RA and DEC when you use the
autoguider.
Guide star
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