Celestron Compustar Manuál s instrukcemi stáhnout pdf (Strana 38)

generate. All these problems result in guiding errors. The goal of rebalancing the telescope is to

put the telescope‟s center of gravity back at that intersection, to restore optimal function of the

system.

By first balancing the telescope vertically, you ensure that the telescope‟s center of gravity lies

somewhere along the longitudinal axis. If the telescope swings north, that means the center of

gravity is actually somewhere above the longitudinal axis. If the telescope swings south, then it

is somewhere below the longitudinal axis. This is why you must add weight to the opposite side

until the movement stops, which indicates that the center of gravity has been put back

somewhere along the longitudinal axis. At this point, where the weight is added along the

longitudinal axis is totally irrelevant. That will be dealt with during the horizontal balancing.

However, if the center of gravity is not somewhere along the longitudinal axis, then sliding

weights either forward or backward during the horizontal phase of balancing has no hope of

putting the center of gravity back on the intersection point of the three axes. It will always be

somewhere above or below that intersection point.

You will learn whether the added weight has put the center of gravity in front of or behind the

triple intersection point when you start the horizontal phase of balancing. If the front end drops

down, then you have put the center of gravity somewhere along the longitudinal axis in front of

the triple intersection. If the front end swings up, then you have put the center of gravity

somewhere along the longitudinal axis toward the rear of the triple intersection point. When you

have counteracted any movement, then you have achieved putting the center of gravity on the

triple intersection point and the telescope is dynamically balanced. This is also why just sliding

counterweights forward or backward along the counterweight bar until the telescope seems

balanced when aimed at the its imaging target, which is what most people do, doesn‟t properly

do the job of balancing the telescope.

There are some practical pointers. If most of the weight you add to your Compustar is camera

equipment at the rear cell, then the additional weight will be centered along the longitudinal axis

and the telescope will likely remain in vertical balance. Therefore, you will not need to add any

weight on either the top or bottom counterweight bar assemblies. Unfortunately, this will leave

you lacking any ballast that you can slide forward or backward to achieve horizontal balance.

The solution is to add an equal amount of weight to both counterweight bar assemblies anyway.

This will maintain the telescope in vertical balance and still provide you with the ballast you

need to ultimately balance the telescope horizontally.

If you are really smart, you are wondering about balancing the telescope in the third direction,

along the axis between the two fork arm swivels. Measures have already been taken to balance

the unique configurations of the Compustars in that third dimension. For example, the 8x50

finderscope on the Compustar C8 has been shifted from the left rear side of the optical tube to

the lateral side of the left fork arm to counterbalance the weight of the declination drive box on

the right fork arm. The Compustar C11 and C14 have finderscopes in their usual positions, but

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Celestron Compustar Manuál s instrukcemi Strana 38