[ATM] Difraction Spikes
Peter De Baan De Baan
pdebaan at hotmail.com
Sat Oct 31 05:28:01 JST 2009
What causes the 4 poined spike around brighter stars oncamera pictures made with refractor telescope ?
baffled without the obsrtuction
> From: richard1941 at gmail.com
> To: mjc5 at psu.edu
> Date: Fri, 30 Oct 2009 09:15:11 -0700
> CC: atm at atmlist.net
> Subject: Re: [ATM] Difraction Spikes
> What if the spider vanes are relocated to the edge of the aperture, so
> as th reduce the diameter? I think any reduction in aperture "blurs"
> the image.
> Consider, for a moment, the Allen Telescope Array-- it has huge
> obstructions (the space between the dishes).
> I apologize in advance for questioning dogma and trying to provoke
> thought and fourier series. Note that i have long advocated piano
> wire spyders and given up on Art Leonard (PBUH) technology.
> Sent from Richard's iPhone
> On Oct 30, 2009, at 5:52, Michael Coslo <mjc5 at psu.edu> wrote:
> > On Oct 30, 2009, at 12:23 AM, Jack Swaton @ Starry Host wrote:
> >> Do diffraction spikes actually blur the object causing them? For
> >> instance,
> >> is the view of Jupiter less sharp because of the spikes or the
> >> thickness of
> >> the spikes?
> > They tend to lower the contrast of the image, mostly through light
> > scattering. And humans tend to interpret lower contrast as less sharp.
> > -73 de Mike N3LI -
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