What is chromatic aberration?
Hi guys,
Was checking out on the definition of chromatic aberration and I thought might as well share it here too.
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When white light passes through a lens (or any glass), and the red, green and blue light does not align back to the same spot after it leaves the glass. That will cause a slight color tinge and reduce sharpness and it's known as chromatic aberration.
Illustration from York University.
As a result, this is what you will see...
Image taken from Macro Lenses Reviewed (canon mount)
The image from the right suffers from chromatic aberration.
Here is a better article on chromatic aberration on www.dpreview.com.
A short article on chromatic aberration on dpreview
There's also a section on how to reduce the effect digitally.
Another article by Canon on chromatic aberration
The effect in aquatic photography is caused by the front glass pane. The thicker, the more obvious it will be, especially when shooting from an angle. This is also the reason why premium lenses does not perform any better than cheap lenses some times. The optics on your premium lenses/equipment is heavily discounted by the aquarium glass.
Note that in aquatic photography, the fringing effect may not be purple, more often further complicated by a colored light source and tinted aquarium glass.
There's a few way to avoid/reduce this effect.
01. Shoot directly perpendicular to the front glass pane
02. Use ultra clear glass for the front glass pane of your aquarium. Starphire glass is prefered by a lot of serious aquarist, especially for showing the true colors of reef tanks. This type of glass are also of high/optical quality and fairly distortion free.
Hope the above gives you guys an understanding why there's a color fringe in your pictures sometimes.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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