Re: A narrowband Crab Nebula


Feb 17 7:35 AM

 


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#14377 Feb 17 7:35 AM

I took this on Sunday, Monday and Wednesday nights of this week. Seeing

was only so so: in the 4-5 arc-sec range for the Sulfur and Oxygen and

in the mid 3s for Halpha.



There was also a lot of moon too but the skies were clear and I had a

new telescope to test so what's a guy to do?



Maybe I will get a rematch with good seeing before this gets too low in

the sky this season.



www.narrowbandimaging.com/m1_mk1sn2_s2hao3_page.htm



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#14378 Feb 17 8:05 AM

In a message dated 2/17/2006 9:46:55 AM Central Standard Time,

rdcrisp@... writes:



> www.narrowbandimaging.com/m1_mk1sn2_s2hao3_page.htm

>



That is quite a magnificent image.



Rolando





[Non-text portions of this message have been removed]



----------------------------

#14379 Feb 17 9:24 AM

--- In ap-gto@yahoogroups.com, chris1011@... wrote: >

> In a message dated 2/17/2006 9:46:55 AM Central Standard Time,

> rdcrisp@... writes:

>

>

> > www.narrowbandimaging.com/m1_mk1sn2_s2hao3_page.htm

> >

>

> That is quite a magnificent image.

>

> Rolando



Thank you Roland. You had a lot to do with it in at least two ways:



1) the wonderful AP1200GTO mount handles the load of that big cass

marvelously, yet today I am only using five counterweights. At the

moment I am guiding using a pickoff prism and an ST7ME but I intend

to deploy the Pempro software to further improve things. At 5670mm

every little bit helps.



2) your words of encouragement regarding the advantages you see of

the Classical Cassegrain configuration over the Ritchey Chretien

configuration really ratched up my efforts to make the project work.



The first deployment of the optics showed that they worked fine but

the frame had some issues with regard to weight and size and then the

optics were damaged in an unfortunate accident.



But once I read your reasoning on why you like the CC configuration

over the RC, it encouraged me to design and build a better frame and

now I see it starting to pay off.



Did you see the out of focus star tests?



www.narrowbandimaging.com/images/mk1sn2_focus1.jpg



www.narrowbandimaging.com/images/mk1sn2_focus2.jpg



the chip missing from the primary mirror shows up very well but at-

focus things seem to still work pretty well.



the chip shows up here pretty well



www.narrowbandimaging.com/images/mk1sn2_mirror_box.jpg



----------------------------

#14382 Feb 19 10:24 AM

Hi Richard,

The detail is excellent for that seeing. The colors look good

meaning you had good SNR even if seeing spreads the target

definition a bit.

Rick

--- In ap-gto@yahoogroups.com, "rdcrisp" rdcrisp@...> wrote:

>

> I took this on Sunday, Monday and Wednesday nights of this week.

Seeing

> was only so so: in the 4-5 arc-sec range for the Sulfur and Oxygen

and

> in the mid 3s for Halpha.

>

> There was also a lot of moon too but the skies were clear and I

had a

> new telescope to test so what's a guy to do?

>

> Maybe I will get a rematch with good seeing before this gets too

low in

> the sky this season.

>

> www.narrowbandimaging.com/m1_mk1sn2_s2hao3_page.htm

>



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