Telescope Star Test Pattern Printable How to star test a telescope BBC Sky at Night Magazine Examine the quality of your telescope s optics by conducting a simple star test and enjoy clearer views of the night
To perform a star test you will need to set your telescope up to point to a bright star such as Sirius or Vega and you will need a high magnification eyepiece ideally in the 10 20mm range A tracking mount is very handy to keep the star in the field of view but it s not a requirement Star testing telescope optical quality PAGE HIGHLIGHTS Artificial star size and distance Star test diffraction patterns Foucault star test Ronchi star test As FIG 96 shows even a slight presence of any wavefront aberration changes the form of diffraction pattern leaving its unique fingerprint on it
Telescope Star Test Pattern Printable
Telescope Star Test Pattern Printable
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Star Testing Telescope Optical Quality
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Star Testing Telescope Quality
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The test star should be accurately centered Testing a star off center or testing a scope not accurately aligned collimated or testing a scope that has not cooled to the night time air temperature can produce spurious results Remember that the star test is a complete test that includes optics and telescope This section will describe how to star test a telescope and give examples of the most common aberrations For more details on the errors you might see check out the Optical Aberrations page Note First a warning
To get you through this trauma I ve created a simple easy to follow procedure to evaluate your optics It requires you your telescope and a night of good seeing atmospheric steadiness A 10 inch telescope of good quality has a resolving power of 0 46 arc seconds just higher than necessary to resolve the air turbulence A 12 inch telescope might resolve them clearly and that very added aperture is enough to render better images in the 10 inch than in the larger aperture
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The basic principle of startesting is simple observe the unfocused image of a star using a magnification at least equal to the mirror diameter in mm For example use a 500x for a 500 mm diameter U nfocusing must be moderate You should see between 5 and 10 diffraction rings for the whole test except for specific flaws described later 1 The setup The basic setup is very simple and consists of three parts or components Fig 1 the telescope to be collimated a spherical mirror and an artificial star For my example the telescope is a Celestron C5 a Schmidt Cassegrain telescope SCT optical tube When collimating indoors you don t have to use a tracking mount
What should an ideal diffraction pattern for a star test be in a reflector Should it be the same on both sides of focus In my reflector one side of focus has small evenly spaced diffraction rings while the other side has small rings for the most part except that the outermost ring is enormous Polaris is bright enough to star test on and it stays put long enough to let you examine your mirror s diffraction pattern without constantly nudging the scope That simplifies the design considerably I just prop it on a stick of the right length to
How To Star Test A Telescope BBC Sky At Night Magazine
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Startest For Collimation
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How to star test a telescope BBC Sky at Night Magazine Examine the quality of your telescope s optics by conducting a simple star test and enjoy clearer views of the night
https://perfectastronomy.com/projects/star-test-telescope
To perform a star test you will need to set your telescope up to point to a bright star such as Sirius or Vega and you will need a high magnification eyepiece ideally in the 10 20mm range A tracking mount is very handy to keep the star in the field of view but it s not a requirement
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Telescope Star Test Pattern Printable - A 10 inch telescope of good quality has a resolving power of 0 46 arc seconds just higher than necessary to resolve the air turbulence A 12 inch telescope might resolve them clearly and that very added aperture is enough to render better images in the 10 inch than in the larger aperture
