Tuesday, 9 November 2010

Thanks to Mr Bahtinov……

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Bizibilder has made himself a “thing” called a Bahtinov Mask (after a Russian called Mr Bahtinov of course!!).  It is made from a Tesco’s plastic clipboard with lots of slots cut into it in a very specific pattern.  The idea is that you put this over the end of the telescope and aim at a brightish star, this causes the diffraction pattern (spikes) shown in the second image.  The clever bit is that the central spike that passes through the “crossed spikes” will only be dead centre when the telescope is at perfect focus.  Simples!

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