Question about Optics
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Posted on Jan 02, 2017
SOURCE: lost manual
Here are the Bushnell manuals-- find one similar to your telescope--
Posted on May 17, 2009
I just assisted a friend "re-calibrate" his D.W. L6-20 Level Transit. Follow the following steps.
1. Set up the tripod & transit in the garage. Get the platform with the protractor, close to level.
2. Position the telescope at "0". The telescope should be over 2 of the adjusting screws.
3. Adjust the screws to get the top bubble close to level. Adjust with a screwdriver the spring loaded screw to get the bubble closer to center.
4. Rotate the scope 180 degrees. Note the difference in the bubble position. Split the difference from the first bubble location by adjusting the same top screw.
5. Rotate back to 0. Adjust the same top screw to split the difference in bubble position.
6. Rotate back to 180 degrees. The bubble should be off by the same amount. Adjust the 2 bottom screw to place the level in the center.
7. Rotate back to 0. The bubble should not move.
8. Rotate to 90 degrees and adjust the 2 bottom screws to place the bubble in the center.
9. Rotate to 270 degrees. The bubble should be centered.
10. From this point on, all you need to do is place the level on the tripod and position it over your reference point with a plumb bob. Adjust the bottom 2 screws at 0 and again at 90. The level is set to use.
Posted on Aug 03, 2010
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