OP - Seidel Aberration Theory - Week 10

Question 1

How are the following aberrations affected by shape factor (central aberrations):

• Spherical
• coma
• astigmatism
• petzval
• distortion

Answer 1

Spherical = quadratic

Coma = linear

Astigmatism and petzval = unaffected

Distortion = 0

Question 2

How are the following aberrations affected by shape factor (NON-central aberrations):

• spherical
• coma
• astigmatism
• petzval
• distortion

Answer 2

All the listed aberrations (except petzval) are Quadratic

Petzval is unaffected

Question 3

What limits shape factor?

Answer 3

The ability of the lens to be physically manufactured. More curved lenses are harder to make

Aim for |pF| < 1

Question 4

What trick can you use to overcome the limitation of shape factor?

Answer 4

Balance the aberrations between multiple lens surfaces in the optical system