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  1. #11
    Poisson Du Jour's Avatar
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    Quote Originally Posted by Photo Engineer View Post
    There are several things that could be going on. All of the above are good points but you have to remember that Red/Green/Blue all focus at different planes due to the way they interact with glass. Coatings are applied to correct for this, and bad, missing or improper (old) coatings don't do a very good job.
    PE

    Coatings correct aberration??
    If I recall correctly the composition and structure of the glass in a lens i.e. aspheric/LD/ULD/CaF2 (fluorite) greatly reduces (but can never exliminate) colour aberration: the falling of R/G/B rays at different points; I don't know where coating comes into the formula. I agree the problem with red is more peculiar to the film emulsion than the optic; it never worked for me on Velvia, only Kodachrome 200.
    Last edited by Poisson Du Jour; 02-10-2009 at 07:00 PM. Click to view previous post history.
    .::Gary Rowan Higgins

    A comfort zone is a wonderful place. But nothing ever grows there.
    —Anon.






  2. #12
    Photo Engineer's Avatar
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    Fish of the day;

    Please consider that different films have different thicknesses.

    PE

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