[ATM] Difraction Spikes
marco.miglionico at btinternet.com
Sat Oct 31 07:24:05 JST 2009
That's the window frame that the telescope is pointed through.
----- Original Message -----
From: "Peter De Baan De Baan" <pdebaan at hotmail.com>
To: "Richard Schwartz" <richard1941 at gmail.com>; <mjc5 at psu.edu>
Cc: <atm at atmlist.net>
Sent: Friday, October 30, 2009 8:28 PM
Subject: Re: [ATM] Difraction Spikes
> 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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