6
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Accepted
Can a Ritchey–Chrétien telescope be collimated using a standard Newtonian laser collimator?
No, the fundamental designs of the two types of telescope are in this respect quite different.
The Newtonian laser collimator works by shining a laser through the eyepiece holder to the secondary ...
- 1,345
3
votes
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Laser Colimator vs Cheshire eyepiece
Why not both? (if you can afford them)
Both will do the job, but each has its strengths.
Cheshire eyepiece (or, more properly, Cheshire/sight tube combo, which is the popular combination nowadays):
...
- 18.1k
3
votes
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Newtonian reflector collimation question
Your scope is f/5. There will always be some coma aberration.
Always, the image quality is worse as you get closer to the edge of the field of view (FOV).
Personally, given that the fact that you will ...
- 316
3
votes
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Collimating with a home-made collimation cap
The Gary Seronik website that you cite is a good one - it's not leading you astray!
There are a couple of important things to look at:
Look straight down the main tube of your telescope at the ...
- 644
2
votes
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Laser Collimator producing oval not circle on the Primary
This is a slightly tricky one. For a conventional Newtonian reflector, shining a laser collimator back over the secondary to the primary should present a small dot on the primary - the task then is to ...
- 644
2
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Laser Collimator producing oval not circle on the Primary
First of all, what do stars look like through the scope, particular just inside and outside focus? If they are oval, then read on.
I'm not familiar with this telescope, but I suspect the most likely ...
- 4,304
2
votes
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Telescope collimation issue
First off - good job for paying attention to collimation. For a newtonian telescope, it is as important as changing the oil on your car.
It would help to know a little bit more about the telescope. ...
- 18.1k
2
votes
What are the aberrations of an SCT? And how can they be eliminated?
The primary aberration present in a Schmidt–Cassegrain telescope is spherical, due to the primary mirror being spherical in shape; that causes light at the edges to have a different path length than ...
- 2,616
1
vote
Is a mirror cell only necessary for collimation?
The primary mirror needs to be on a support (a mirror cell) that lets you adjust the tilt of the primary mirror.
The turnbuckles you are describing change the tilt of the secondary mirror. It does not ...
- 7,797
1
vote
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Celestron C14 collimation and cleaning
Will this affect image quality? It depends on "where" the dust is located. If on the telescope, then not very much. If on the sensor, you'll get the shadows of the dust on your images (...
- 1,551
1
vote
Accepted
What are the aberrations of an SCT? And how can they be eliminated?
Astigmatism. No way to eliminate in SCT. Reduce it with proper fixing of every optical element. Astigmatism is only eliminated with 3-mirror scheme.
Curvature of field. No way to eliminate in SCT.
...
- 351
1
vote
collimating AstroMaster 114
With a tube length of 46 cm and a focal length of 100 cm, probably the AstroMaster 114EQ is not a classical Newtonian but uses a fast (e.g. f/4) spherical primary mirror and a corrector lens built ...
- 18.2k
1
vote
Accepted
Laser Collimator For Dobsonian vs Newtonian
A Dob is a Newtonian, so yes it will work. Strictly speaking the Dob bit is the mount, but it's nearly always a newtonian that's mounted.
- 4,304
1
vote
I'm having trouble achieving sharp telescope focus
Did you try to slowly "fine tune" your focus when using the 10/6 mm eyepieces? The higher the magnification, the more sensitive focus is to adjustment.
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