Re: [APML] New TP pictures

[Duncan <dmunro@sfu.ca>]

I can't see how either of those could cause this effect. Where you using 
a dewheater on your OTA?

thanks

Duncan

joe wrote:

> Duncan, I used to have that same 'single spike' on bright stars in my 
> old 10" LX-5 SCT too.  I'd guess it's something to do with either the 
> corrector plate or the light baffel...joe  :)
>
>
> "May You Go Among The Imperishable Stars"
>
> Joe Mize:     jmize@svic.net
> StarFields Observatory   http://www.cav-sfo.com
> Chiefland, FL    29:24'33.4"N    82:51'37.7"W
> Moon Phase:     http://tycho.usno.navy.mil/cgi-bin/phase.gif
>
> ----- Original Message ----- From: "Duncan Munro" <dmunro@sfu.ca>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Friday, March 18, 2005 1:42 AM
> Subject: Re: [APML] New TP pictures
>
>
>> You can't beat techpan for it's deepspace "mood".  I really enjoyed 
>> the other techpan shots as well. I can't seem to find any info on 
>> David's equipment. I'm really curious to know what mount he's using.
>>
>> Also,I wonder what is causing the single spike effect on  the bright 
>> star in the M101 image. This effect is also present in the M81 image 
>> as well. I am getting a similar "single spike" effect with my 10" SCT 
>> and I suspect it may be caused by by dewzapper running at too high an 
>> amperage but maybe someone has an alternate explanation?
>>
>> cheers
>>
>> Duncan
>>
>> GARY HATFIELD wrote:
>>
>>> Nice shots David!  I especially like the M101 image.  Can't help you 
>>> on your question, I don't know either.
>>>  Gary
>>>
>>>     ----- Original Message -----
>>>     *From:* davidanna <mailto:davidanna@jazzfree.com>
>>>     *To:* Discussion of Film Astrophotography
>>>     <mailto:astro-photo@seds.org>
>>>     *Sent:* Wednesday, March 17, 2004 3:09 PM
>>>     *Subject:* [APML] New TP pictures
>>>
>>>     Hi list
>>>      I have posted two new TP images from last new moon, I hope you
>>>     enjoy them
>>>     BTW does anyone know the difference between Substract and Absolute
>>>     Difference making compositions with Picture Window?
>>>      http://eureka.ya.com/astrophoto/new.htm
>>>      David Gimenez i Rocamora
>>>     Corbera de Llobregat
>>>     mailto:davidanna@jazzfree.com
>>>     http://eureka.ya.com/astrophoto/index.htm
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