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Old 11-06-2008, 05:38 PM
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iceman (Mike)
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Article: Revealing Star Colours using the Defocusing Technique

Al Sheehan (sheeny) has written an article describing how to Reveal Star Colours using the Defocusing Technique.

You can read the article from the IceInSpace Projects & Articles page, or directly by clicking on the link below:

Revealing Star Colours using the Defocusing Technique

Thanks to Al for taking the time to write the article and submit it to IceInSpace. If you'd like to submit an article or review to IceInSpace, please Contact Me.

Last edited by iceman; 12-06-2008 at 02:23 PM.
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Old 12-06-2008, 02:24 PM
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Article uploaded.
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Old 13-04-2013, 05:55 PM
barry2718 (Barry)
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Awesome photo idea to try

Must try this out with my DSLR. Thanks for the idea and info. Barry
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Old 14-04-2013, 07:58 PM
raymo
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Variations on this idea have been around ever since astrophotography
was invented. My favourite one is to use a zoom with a decent range,
say 35-135 for instance, set low ISO, say 200; defocus the stars so you can see a small disc, trial and error short equal length exposures, with
just enough time between exposures to zoom in in equal steps, so that
instead of the fan like appearance, you end up with each star looking
like a series of cylinders of increasing diameter. Each diam. cylinder having a different shade of it's colour. It will take a few tries
to get it right, but the end result is quite unusual, and, of course also
highlights the star colours.
raymo
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Old 14-04-2013, 08:03 PM
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P.S. Don't alter the focus during the exposures; the zooming makes
the stars bigger, as long as they are defocussed in the first place.
raymo
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