[ATMoB-discuss] First photo from C14/ST7 - reprocessed

[John Boudreau]

> I'm thinking of the challenge of capturing M57 with the 'rose petals' like
> in the Wikipedia link I sent out earlier. I bet that would take many more
> frames to get that detail.

That would take several hours of total exposure, and the C14 would really need a focal reducer for that to quicken the f-ratio --- even then you'd probably only capture the first halo well. Binning the camera 2x2 would help also.

Here's a shot of it by Tony Hallas, taken at f/8. 
http://www.astrophoto.com/Ring.htm
He took 2 hours of luminance exposure for the outer halos, and 3 for the RGB. But it was taken in a 6.5 mag sky which results in a much better signal/noise ratio than you can get from the clubhouse sky in that timeframe.

---John


----- Original Message ----- 
From: "Bruce Berger" <bruce at scopemaker.com>
Cc: <atmob-discuss at atmob.org>
Sent: Wednesday, August 09, 2006 1:05 PM
Subject: RE: [ATMoB-discuss] First photo from C14/ST7 - reprocessed


> To be fair John, this isn't my first astroimage. I've done some tinkering
> with the Meade DSI, a webcam, and a Minolta DSLR. I'm also pretty good with
> Photoshop, but more so on non-astro stuff. But I still consider myself a
> beginner.
> 
> I'm thinking of the challenge of capturing M57 with the 'rose petals' like
> in the Wikipedia link I sent out earlier. I bet that would take many more
> frames to get that detail.
> 
> Bruce
> 
> 
> 
> -----Original Message-----
> From: Buonomo, John [mailto:Jbuonomo at uhs.harvard.edu] 
> Sent: Wednesday, August 09, 2006 12:29 PM
> To: mmotta at massmed.org; bruce at scopemaker.com
> Cc: atmob-discuss at atmob.org
> Subject: RE: [ATMoB-discuss] First photo from C14/ST7 - reprocessed
> 
> 
> Bruce,
> I cant wait to see the future images...
> For a first Image, this rivals my latest images...I only wish I had as good
> of results with my 1st!
> Good Job !
> John
> 
> 
> 
> 
> 
> -----Original Message-----
> From: atmob-discuss-bounces at atmob.org
> [mailto:atmob-discuss-bounces at atmob.org] On Behalf Of mmotta at massmed.org
> Sent: Wed., Aug. 09, 2006 10:35 AM
> To: bruce at scopemaker.com
> Cc: atmob-discuss at atmob.org
> Subject: Re: [ATMoB-discuss] First photo from C14/ST7 - reprocessed
> 
> Much, much better. Good job, and great first image!
> 
> Mario
> 
> On Wed, 9 Aug 2006 08:48:13 -0400, "Bruce Berger" wrote:
> 
>> 
>> I took advice from this group and re-processed the images last night.
>> 
>> I did dark & bias reduction in CCDSoft for each individual image, then 
>> aligned and combined. After that there was some very minor histogram 
>> adjustment with Photoshop CS2. I think you'll agree that this 2nd 
>> composite is quite an improvement over the first. If this is
> what
>> a 'beginner' can do,
>> I can't wait to get some more time and images under my belt.
>> 
>> Take a look! It's in the AstroImaging Gallery, or try this link.
>> 
>> http://atmob.org/gallery/showimage.php?id=323
>> 
>> Bruce
>> _______________________________________________
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