Lens Aberrations

Chromatic Aberrations.
 - Light passes through glass elements and is dispersed into it's correct colours.
 - Axial and Traverse - Common in wide angle lenses. 


Axial Aberrations
 - Can be reduced by careful use of the other aberrations


Types of Aberrations
 - Achromatic
 - Aporchromatic
 - Superchromatic 


Coma (NOT COOMA)
 - An off axis sperical aberration creating cone shaped points.
 - Stopping down can slightly reduce effects.


A Stigmatism
 -  Axis aberration causing vertical and horizontal lines to be focused in two different planes.
Image Distortion 
- Pin cushioning and lens barrelling
- Image sharpness not affected 
- Cannot be reduced by stopping down   

Week Six - To Infinity

Hyper-focal Distance 

"The concept of hyperfocal distance is easy to understand: focus a lens at the hyperfocal distance and everything in the photograph from some near distance to infinity will be sharp." - http://www.dofmaster.com/hyperfocal.html 

Senor Array Types 

• CCD (Charged Coupled Device)  
• CMOS (Complementing Metal Oxide Semi-colour)

Pixels - [Effective and Inactive] 

Dynamic Range 

• Ability of sensor to record high and low luminance 
• SLR - Subject Luminance Range
• Film - Known as Density Range
• Blooming 
• 
  
  

  When light passes the lens of a digital camera and is captured by the CCD it is converted into an electrical charge. There is a limit to how much charge each pixel or photosite can store.  - http://en.mimi.hu/photography/blooming.html