Re: [APML] Diffraction spikes with a refractor

["John C. Mirtle" <jmirtle@shaw.ca>]

Nice one John, an excellent Newtonian filter! (nice picture too!) It adds a nice
punch to the picture, but then I am somewhat biased. Can you duplicate the 6
spikes found on Schmidt camera images???

John Mirtle
Calgary, Ab. Canada

----- Original Message -----
From: "John Boudreau" <jeboud@mediaone.net>
To: <astro-photo@seds.org>
Sent: Sunday, December 02, 2001 11:34 PM
Subject: [APML] Diffraction spikes with a refractor


> Hi all, recently I haven't been active on this list due to computer
> problems, but my system's fine now. I did get to see many of your fine
> Leonid shots in between W98 lockups though <g>. Great work guys! Mine
> suffered from terrible lens aberrations, overexposure and just plain bad
> luck, with the best meteors largely out of the frames.
>
> A couple of weeks ago I cobbled up a wire mask for my TV85 to make
> diffraction spikes on the brighter stars in an image. I had recalled John
> Gleason doing the same thing with a AP refractor a year or two ago. I
> believed he used heavy fishing line.
>
> Here's a hypered RG200 shot of the Pleiades showing the spikes:
> http://people.ne.mediaone.net/jeboud/m45.htm
>
<-snip->


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