David White LT8-300, Owner'S Manual

-10-

-  Use the optical plummet to view the 

reference point on the ground. Sight 

through the optical plummet eyepiece 

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 located beneath the telescope 

eyepiece.

-  Turn the optical plummet eyepiece 

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to bring the crosshairs into focus.

NOTE: The image seen in the eyepiece is 

reversed left to right. This is important to 

remember when shifting the instrument or 

tripod to center over the reference point.

-  Line up the crosshairs with the 

reference point.

If necessary, the instrument can be 

shifted by loosening the tripod center stud 

and sliding the instrument from side to 

side for proper positioning.

Positioning LT8-300LP Directly Over Point

To switch ON the laser plummet, press 

and release the ON switch 

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.  A laser 

point will project through the center of the 

instrument to the reference point (a stake 

on the ground).
-  Line up the tripod over the reference 

point.

-  Remove the plumb bob hanger from 

the center stud of the tripod.

-  Attach the instrument to the tripod.
-  Level the instrument.
-   Line up the laser point with the 

reference point.

If necessary, the instrument can be 

shifted by loosening the tripod center stud 

and sliding the instrument from side to 

side for proper positioning.

Leveling the Instrument

Set the instrument leveling screws.  

Turn down the leveling screws until firm 

contact is made with the instrument base. 

!

CAUTION

Do not overtighten the 

leveling screws. 

It is 

very possible to overtighten the leveling 

screws. Only a firm contact between the 

screws and the base is necessary. If the 

instrument shifts on the base, turn down 

the screw more firmly by hand.

Leveling the instrument so the vial bubble 

remains centered through a 360° rotation 

of the telescope is the most important 

operation in preparing to use your 

instrument. 

When leveling your instrument, be sure 

not to touch the tripod. Follow these 

instructions carefully.

Line up the telescope so that it is directly 

over one pair of leveling screws. 

Grasp these two leveling screws with the 

thumb and forefinger of each hand. 

Turn both screws at the same time

 by 

moving your thumbs toward each other 

or away from each other, until the bubble 

is centered.
When the bubble is centered, rotate the 

telescope 90 degrees over the second 

pair of leveling screws and repeat the 

thumbs in, thumbs out leveling procedure 

until the bubble is again centered.

Shift back to the original position and 

check the level.

Optical 
Plummet
Eyepiece

Reference 

Point