# collimation error

## collimation error

[‚käl·ə′mā·shən ‚er·ər]
(astronomy)
The amount by which the angle between the optical axis of a transit telescope and its east-west mechanical axis deviates from 90°.
(engineering)
Angular error in magnitude and direction between two nominally parallel lines of sight.
Specifically, the angle by which the line of sight of a radar differs from what it should be.
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References in periodicals archive ?
It should be noted that in addition to being sensitive to odd order harmonics, such front-face back-face measurements are also sensitive to numerous other sources of misalignment such as collimation error, non-orthogonality between the standing axis and the transit axis, etc.
Because the range and the vertical angle to the two targets are equal, we eliminate any sources that may produce horizontal angle errors that are functions of nominal range and nominal vertical angle (for example, those arising from a squareness error, collimation error, beam offset along the transit axis, etc.).
Evaluate of the standard deviation of a collimation error (pointing to the scale stroke) is equal to 2.15", when the evaluate of general standard deviation of entire measurement procedure is 2.31" [9].
Collimation error is a systematic error, and in practical work, the adjustment is carried to where the error is so small that it is considered to be negligible.
A form of peg adjustment that determines collimation error of levels.
The component along T is equivalent to collimation error in theodolites.
Two-thirds of this shift was from the diagonal's collimation error. This flaw can make it difficult to achieve an accurate alignment when you're calibrating a Go To mount, resulting in pointing errors as you slew around the sky, not to mention the annoyance of having to re-center objects as you rotate the diagonal.
But f/9.2 is so forgiving of minor collimation errors that you will probably never need to adjust the mirrors.
Insisting on good-quality mechanics when you buy your binoculars ensures that they will last longer before collimation errors become a problem.
The area of acceptable star images is essentially the same size as StarShoot II's chip, so even small collimation errors result in uneven stars across the field.
To make matters worse, I've found that my eyes are far less tolerant of collimation errors in the dark than in daylight--at night, relatively minor collimation errors can noticeably degrade performance.

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