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Thread: Flash Extender Construction Help

  1. #1

    Default Flash Extender Construction Help

    Hi everyone

    I am constructing a flash extender. However I am unsure of the distance to put the fresnel lens.

    I have tried different combinations, like putting the lens before and after the focal point of the lens.

    However I am unsure which and what is right. The concept is to extend the range of the flash. But is it suppose to concentrate the light into 1 spot or diffuse it around the area?

    If you have pictures do post...

  2. #2

    Default Re: Flash Extender Construction Help

    Originally posted by afiend
    Hi everyone

    I am constructing a flash extender. However I am unsure of the distance to put the fresnel lens.

    I have tried different combinations, like putting the lens before and after the focal point of the lens.

    However I am unsure which and what is right. The concept is to extend the range of the flash. But is it suppose to concentrate the light into 1 spot or diffuse it around the area?

    If you have pictures do post...
    Put it much nearer than the focal point. I started with the focal point... and I noticed that I can actually see the shape of my flash in the pix cos it was too focused... the idea is just to gather light around the central area.

    If you are using the standard fresnal lens you buy at Popular Book Store... I remember the focal length to be about 17-18cm.. You might want to put it about 14cm... (Then it can fold nicely with the lens as well.)

    You might want to see the pix below for an approximate gauge...

    Your mileage may vary..

    Good luck!

  3. #3

    Default

    thanks! will try it out and let u know...

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