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Equipment Discussions >> Cats & Casses

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WarmWeatherGuy
Carpal Tunnel
*****

Reged: 08/27/11

Loc: Orlando, FL 28° N, 81° W
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Jeff Struve]
      #5513063 - 11/10/12 11:38 AM

The exposure time goes with the ratio of the f numbers squared. Going from f/10 to f/2 is a ratio of 5 so you would need 1/25th the time. This makes tracking way easier. Your refractor might be f/6 so it would be 1/9th the time when compared to that.

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Jeff Struve
professor emeritus


Reged: 11/05/10

Loc: Iowa, USA
Re: Setting up a Celestron Edge HD11 for CCD new [Re: WarmWeatherGuy]
      #5513070 - 11/10/12 11:45 AM

Ah... so what you are saying is that the C11 at F2 will take the same pic I can take with the 80mm but the C11 would allow it done with much shorter exposure times?

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WarmWeatherGuy
Carpal Tunnel
*****

Reged: 08/27/11

Loc: Orlando, FL 28° N, 81° W
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Jeff Struve]
      #5513074 - 11/10/12 11:49 AM

Yes. They would both have about the same focal length so the field of view would be about the same but the C11 would collect way more light.

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Jeff Struve
professor emeritus


Reged: 11/05/10

Loc: Iowa, USA
Re: Setting up a Celestron Edge HD11 for CCD new [Re: WarmWeatherGuy]
      #5513080 - 11/10/12 11:52 AM

I really appreciate that explanation.... I am not sure if I should put the $$$ into the Hyperstar like I planed or something else... that really sounds enticing to take shorter exposures tho...

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rigelsys
Vendor (Rigel Systems)


Reged: 08/22/06

Re: Setting up a Celestron Edge HD11 for CCD new [Re: Jeff Struve]
      #5513605 - 11/10/12 07:50 PM

With bigger aperature it will be brighter and resolution will be finer. or so theory says. Shorter exposure times, sharper stars

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Jeff Struve
professor emeritus


Reged: 11/05/10

Loc: Iowa, USA
Re: Setting up a Celestron Edge HD11 for CCD new [Re: rigelsys]
      #5965806 - 07/11/13 02:28 PM Attachment (11 downloads)

I finally had first lite last Friday... learned a lot!

First, mount tracking inaccuracies really show up with a bigger OTA!

I am finding that I will probably need to mess with PEC on my mounts... did not seem to be that big of a deal in the past...

I really don't like how Celestron sets up for cameras... threaded duhinkies rather than standard EP mounting system... I prefer the 2" pressure coupler method...

I bought focus masks for my OTA's... works well visually, but I couldn't figure out what was to happen for photography... all I could see on the focus screen in Maxim was a picture of the full mask... no lines that moved around???

So... I did photgraph a few items... and they came out so-so... but the big issue is using CCDSoft to extract and combine, it would not let me save the final image... so I had to use screen pring to save a jpg... go figure...

Edited by Jeff Struve (07/11/13 03:47 PM)


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Raginar
Postmaster
*****

Reged: 10/19/10

Loc: Rapid CIty, SD
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Jeff Struve]
      #5965938 - 07/11/13 03:45 PM

Jeff,

You gotta keep focusing until the mask does its thing. When it's really out of focus, it looks like you're describing.

A good mount makes a huge difference at the focal length you're trying to image at. Anyone can image at 600mm on an AVX, it's your scope that makes you go 'woah, this is hard!'.

Try using DSS to combine your images. It's just easier.


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Jeff Struve
professor emeritus


Reged: 11/05/10

Loc: Iowa, USA
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Raginar]
      #5970958 - 07/14/13 06:31 PM

Thanx, I did get it to focus.... just didn't think that there would be so much different between the camera and the EP... and yep... this imaging is really difficult... Wind is more noticeable, mount inaccuracies are more noticeable, focus is more noticeable...

Thanx again!


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Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Jeff Struve]
      #5971267 - 07/14/13 10:00 PM Attachment (25 downloads)

I did this with my C11 and hyperstar. It's the picture worth 1000 words...

-Rich


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Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Starhawk]
      #5971270 - 07/14/13 10:01 PM Attachment (19 downloads)

Another...

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Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Starhawk]
      #5971272 - 07/14/13 10:02 PM Attachment (15 downloads)

These are all with 30 second exposures, btw.

-Rich


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Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Starhawk]
      #5971275 - 07/14/13 10:04 PM Attachment (20 downloads)

Detail from the M51 photo. I need to go deeper in these- project for winter.

-Rich


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mark379
sage
*****

Reged: 02/07/09

Loc: New Jersey
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Starhawk]
      #5971924 - 07/15/13 09:54 AM

Quote:

I did this with my C11 and hyperstar. It's the picture worth 1000 words...

-Rich



Very nice... What type of mount is the c 11 on? did you need to do any guiding since exposures were so short?


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Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: Setting up a Celestron Edge HD11 for CCD new [Re: mark379]
      #5973853 - 07/16/13 10:36 AM

It was on its original NexStar 11 GPS forks with a wedge. No guiding was required, though I was losing about one exposure in 6 to wiggle when a breeze came. I have recently deforked and plan to next image on a Mach 1 GTO- mainly because I saw how dark my background was and am curious about what I could get with much longer exposures.

On that note- I need to get moving along on a project to put some cleats of some sort around the periphery of the corrector for cable management.

-Rich


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Jeff Struve
professor emeritus


Reged: 11/05/10

Loc: Iowa, USA
Re: Setting up a Celestron Edge HD11 for CCD new [Re: Starhawk]
      #6070961 - 09/09/13 10:16 AM

Excellent! I was running 30 second subs and didn't get the nebulosity on NGC1499, IC405, or M57... I am using the color CCD, ST8300c.... what camera did you use?

Thanx!


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