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85mm 1.4 L IS preview

Started Oct 31, 2017 | Discussions thread
tim73
tim73 Regular Member • Posts: 489
Re: 85mm 1.4 L IS preview

Steve Balcombe wrote:

tim73 wrote:

Huh? Chromatic aberration is any departure from ideal behaviour that is dependent on colour.

It's more specific than that. It's the aberration that results from the lens focusing different parts of the spectrum at different distances (LoCA) or at different magnifications (LaCA).

I'm going to have to disagree.  The words have a clear technical meaning as they stand, and I don't think it's helpful to ascribe a different or more specific meaning.

For example Brightcolours has his own definition of purple fringes which apparently does not include magenta fringes.  Can you reliably distinguish magenta from purple?  Of course not.

As a scientist (working in optics, as it happens) I think it's very important not to misuse language in this way.  The Wikipedia article, unlike this thread, is quite clear.

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