Ixus860/SD870 Setting Aperture - page 2 - General Discussion and Assistance - CHDK Forum

Ixus860/SD870 Setting Aperture

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Offline fvdk

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Re: Ixus860/SD870 Setting Aperture
« Reply #10 on: 04 / August / 2008, 07:01:48 »
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Well, you could make such a picture if you somehow attach a star filter in front of the lens.
I know that Cokin makes does filters and i believe that they also have them for digital cameras.
Or you could use Photoshop :-)

Frans

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Offline PhyrePhoX

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Re: Ixus860/SD870 Setting Aperture
« Reply #11 on: 04 / August / 2008, 07:02:21 »
you can use a socalled "star filter" to achieve this effect.

edit: fvdk beat me to it :D

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Offline fvdk

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Re: Ixus860/SD870 Setting Aperture
« Reply #12 on: 04 / August / 2008, 07:18:45 »
Here is a link to such a filter:

COKIN Creative System - Filters A/P/Z/X - Optical Effect Filters

You would also need the magnefix holder

COKIN - Magnefix

Frans

Re: Ixus860/SD870 Setting Aperture
« Reply #13 on: 04 / August / 2008, 07:41:34 »
Back in the ancient "film" days we used to use various grades of window screening, other metal meshes, or nylon-stocking material inserted in a filter holder to achieve 4-point star effects. Or 8-point if 2 layers were crossed at 45 degree angles. This would also soften the image too much at times and create a much more coarse star pattern. Sometimes that effect was desired. This was before they had "star-filters" which creates much sharper images. If you could find some fine metal mesh that's woven in a hexagonal pattern then you could get your 6-point star effects. You might also have some success by scoring fine parallel lines in clear acetate (transparency material) using a pin. Space the lines about 3-5mm apart at your desired angles. 1 set of parallel lines will spread the light out in 2 directions perpendicular to the lines. Score as many sets of parallel lines for the star-point angles as you want. Some people prefer to use 3 layers and then adjust the star-point angles by rotating the individual layers, much like using polarizers.



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Offline littlejohn

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Re: Ixus860/SD870 Setting Aperture
« Reply #14 on: 04 / August / 2008, 07:45:51 »
Many thanks to all of the above great helpers. :D

 

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