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Thread: Again....Sphere Aberration

  1. #1
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    Confused Again....Sphere Aberration

    Hello everybody!!

    I am needing a helping hand.
    I've been trying to check out a formula about Sphere Aberration. Forgetting the pupil diameter....

    A lens with:

    Front Curve: 7.00D
    Thickness:5.5mm
    Angle: 30°

    It gave me: 0,05D of Sphere Aberration, is it right?

    I suspect the formula is wrong because as I change the angle the Sphere Aberration changes just a little bit.
    :hammer:

    Thanks guys

    Best regards

    Edgley

  2. #2
    Master OptiBoarder Jeff Trail's Avatar
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    apply Snell's law and you will see why changing the angle is changing the other resultant numbers ;)

    As for the other, it sure makes it easier if you put up the formula you are using and how you wrote it out ... what numbers you plugged in as you went and where ... you must be doing this for some reason, I would take it as academic? ..so telling you the "answer" is not going to really help without seeing the way you came about getting the answer you got...

    Lots of us on here are formula freaks .. might as well take advantage of it, but I for one am not just going to give out the answers if it is for education purposes, that is not really going to help, oh might make life a lot easier but if you don't understand the root formula having the answer really does not help :finger:

    If this is something work related let us know and I'm sure most of us will go about it differently .. if it is school related, you won't get off this easily :D

    Jeff "Wish we had the web when I first went through College" Trail

  3. #3
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    Thumbs up Helping hand

    Hi Jeff

    I like to reason about a formula and and realise where all come from. A right number or "answer", would give a start from what I would realise the other stuff.

    I always try to find my own way.

    It would be too bad and take a long time of mine if I startet with a wrong number.

    The formula that I've been talking about is on the A. E. Conrady's book "Applied Optics And Optical Design" Dover Publications.

    I put the formula in an Excel Sheet too check the "changings".
    Of course, maybe, I made some mistakes on the excel sheet and the result can be wrong. That's why I am trying to check that.

    Now that my teacher is an Optiboard member, I can't take advantage of this anymore:D lololo.

    Did I answer everuthing?:)

    Best regards

    Edgley

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