A common aberration with water-immersion objective lenses

Area of Science:

• Microscopy and optical imaging
• Biophysics
• Materials science

Background:

• Water-immersion objectives are susceptible to optical aberrations.
• Coverslip tilt is a potential source of image distortion in microscopy.

Purpose of the Study:

• To identify and explain a frequently observed aberration in water-immersion microscopy.
• To determine the cause of this aberration and its impact on image quality.

Main Methods:

• Comparative analysis of water-immersion and oil-immersion objectives.
• Optical modeling to simulate light path distortions caused by a tilted coverslip.
• Imaging of subresolution fluorescent beads to observe aberration effects.

Main Results:

• The aberration occurs primarily with water-immersion objectives, not oil-immersion.
• Coverslip tilt was identified as the cause of the aberration.
• Model calculations accurately predicted the observed image distortions.

Conclusions:

• Coverslip tilt is a significant factor causing aberrations in water-immersion microscopy.
• Understanding this aberration is crucial for accurate imaging with water-immersion objectives.
• The findings provide a basis for correcting or mitigating this optical artifact.