Lens Aberrations

  • Thread starter OPTIDONN
  • Start date
13
0

Main Question or Discussion Point

I was doing some reading on lens aberrations and saw some referance to 1st and 3rd order aberrations. What are they and what is the differance? Are there and 2nd order aberrations?
 

Answers and Replies

Claude Bile
Science Advisor
1,471
19
One can derive an equation that gives the error in an image on the image plane as a function of the incident (imperfect) wavefront. 1st order aberrations vary as h (where h is the distance from the centre of the lens), 3rd order aberrations vary as h^3 and so on. The reason there is no 2nd, 4th, 6th.. order aberrations (i.e. no h^2, h^4, h^6...dependances) is because of the cylindrical symmetry of the lens.

There is only 1 first order aberration and it is called defocus.

There are 5 third order aberrations;
Spherical Aberration
Coma
Astigmatism
Distortion
Curvature of Field

The origin of these aberrations (i.e. why they appear) can be found here;

http://wps.aw.com/wps/media/objects/877/898586/topics/topic12.pdf

Claude.
 
13
0
Much of this is still new to me what does ^ mean? Thanks for the answer though. It has cleared a few things up!
 
Claude Bile
Science Advisor
1,471
19
It means 'to the power of', sorry I was a bit lazy.

h^3 = [tex] h^3 [/tex]

and so forth.

Claude.
 

Related Threads for: Lens Aberrations

Replies
7
Views
1K
  • Last Post
Replies
5
Views
4K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
1K
Replies
2
Views
734
Replies
1
Views
981
  • Last Post
Replies
4
Views
2K
Replies
4
Views
7K
Top