Go Back   Steve's Digicams Forums > Digicam Help > What Camera Should I Buy?

Reply
 
Thread Tools Search this Thread
Old Jan 10, 2005, 11:04 AM   #1
Junior Member
 
Join Date: Jan 2005
Posts: 1
Default

Why digital cameras have such problems with blue fringing while analog cameras never had any problems of that kind, even compact ones.

Comparing HP707 and Canon A95 : the former having almost no blue fringing, the latter having a lot of it.
kalima01 is offline   Reply With Quote
Sponsored Links
Old Jan 10, 2005, 12:41 PM   #2
Senior Member
 
Join Date: Nov 2004
Posts: 378
Default

I don't know about the HP camera you mention (perhaps it doesn't have much of a zoom, or you just looked a pictures from it in a small enough scale not to notice? or the lens was really good) but here's a quickie about chromatic aberration (color fringing)

http://www.dcviews.com/tutors/tt55813.htm
Quote:
If you have ever looked through cheap children's binoculars the effect of chromatic aberrations will be all too familiar to you.
This "purple fringing" can sometimes be found on digital cameras as well. To what extent it becomes visible is dependent on the sort of image and the presence of dark or light edges in it.
Different wavelengths of light have different focal lengths and chromatic aberrations develop because of the camera's lens inability to focus these different wavelengths of light onto exactly the same focal plane.
Often the effect of chromatic aberrations is amplified by what we call blooming – the overflow of charge from one pixel to its neighboring pixel on the camera's sensor.
Chromatic aberrations are reduced if special lens systems such as achromatic or apochromatic doublets are used. These use two or more pieces of glass with different reflective characteristics. Not even these are completely perfect however.

Perhaps one of the reasons it's more prevalent (in your view) in the A95 is what's referred to above as "blooming"

"Often the effect of chromatic aberrations is amplified by what we call blooming – the overflow of charge from one pixel to its neighboring pixel on the camera's sensor."

perdendosi is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 10:13 AM.