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Equipment Discussions >> Video and Electronically Assisted Astronomy

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peetyg
member


Reged: 08/28/11

Loc: outside chicago
Mallincam in Chicago...what should I expect. new
      #5343967 - 07/30/12 06:30 PM

I currently love in the northern suburbs of Chicago. So heavy light pollution is a problem. I am also using a a alt/az fork mount cpc hd edge scope (9.25 f10). How difficult would it be to use a Mallincam. Also is the hyper star a must with a f10 system, in order to use the Mallincam.

Thanks

Pettyg


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mclewis1
Thread Killer
*****

Reged: 02/25/06

Loc: New Brunswick, Canada
Re: Mallincam in Chicago...what should I expect. new [Re: peetyg]
      #5344296 - 07/30/12 10:18 PM

A Hyperstar would be exactly the wrong way to go in your heavily light polluted skies. You'd reach the sky fog level really really quickly (which would obliterate anything you were trying to view).

I would use a focal reducer to get the scope down to around f3.5 to f5. You'll benefit from the wider fov and faster f speed (but not so fast like the f2 Hyperstar that you very quickly reach the sky fog levels). I would also invest in a few filters.

Because you are not EQ mounted your exposure/integration times will be limited to under a minute. This means you won't be able to take advantage of the very narrow band filters that some folks use with great results under very light polluted skies. I'd look at either a Deep Sky or an actual "light pollution filter" like the Orion Skyglow imaging, Hutech IDAS LPS v2, or Astronomik CLS-CCD. These options are not going to really cut down all your light pollution but will darken the background somewhat without diminishing the objects too much. You may also consider a step up in filter capability with the Astronomik UHC and IR cut filter combination. This combo offers more rejection of light pollution but also really diminishes the light from most objects making you rely on longer integration times (which then becomes a problem due to field rotation).

Another useful tool will be the Mallincam MCV-1E USB frame grabber. This will be your connection between the video out of the camera and your PC. This particular unit has an additional capability to reduce the black levels, this will also help diminish some of the effects of light polluted skies.

So a moderate amount of focal reduction, moderate filtering, and moderate integration times. That and with careful manipulation of the video controls and the MCV-1E you should get some very surprising images on your PC.

The choice of which higher end model Mallincam won't make much difference. A bit more money will get you longer exposure capabilities (which you won't be able to use in the city) and full PC control (nice but not absolutely necessary). There might be some advantage to getting the optional ExView HAD version of the CCD chip. This is bit a more sensitive chip which some suggest will help with filtering under heavy light polluted skies. I would suggest taking a look through the older posts on the Yahoo Mallincam group for a more definitive answer about choosing this optional chip for your conditions.


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biomedchad
professor emeritus


Reged: 04/13/09

Loc: Marion, Ohio
Re: Mallincam in Chicago...what should I expect. new [Re: mclewis1]
      #5344324 - 07/30/12 10:38 PM

all of this and maybe a call to rock mallin..he always has something in the pipes..he can advise you as per what others have purchased and like i said before..he may have some new sweet combo (cooling and chip) that he can come up with for you!

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Digital Don
Carpal Tunnel
*****

Reged: 01/20/04

Loc: Manteno, IL
Re: Mallincam in Chicago...what should I expect. new [Re: peetyg]
      #5344565 - 07/31/12 01:20 AM Attachment (101 downloads)

Hi Pettyg,

I'm about 45 miles south of Chicago so my skies are not much better than yours. Here's an idea of what I see with my MallinCam VSS+, CPC 1100, and MFR-5 reducer.

Below is a unprocessed 'snapshot' taken with a point-and-shoot camera of the monitor screen. Looks better in person.

I can't say enough about my MallinCam. I'm blown away every time I use it!

Don


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GlennLeDrew
Postmaster
*****

Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Mallincam in Chicago...what should I expect. new [Re: Digital Don]
      #5344598 - 07/31/12 02:28 AM

For alt-az configurations where a field rotator is not in the train, with ~300,000 pixel chips one is limited to exposure durations of 1-2 minutes in most areas of the sky; the worst zone is at/near the zenith. This makes the VSS model quite suitable, with its 112 second maximum integration.

A light pollution filter designed for color imaging will be a must.

For brighter objects such as many planetary nebulae, star clusters and the brighter parts of some galaxies, and particularly when small, imaging at f/10 is viable, if mount tracking is good and field rotation is not a problem. And if the sky glow is particularly bad, you might be limited by this more than by low object surface brightness; if this is so, a focal reducer might be used more for the framing of larger objects. All of that notwithstanding, a focal reducer is useful for keeping exposure duration shorter, by virtue of the higher image surface brightness (a 0.5X reducer makes the image 4X brighter.)


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A. Viegas
scholastic sledgehammer
*****

Reged: 03/05/12

Loc: New York City/ CT
Re: Mallincam in Chicago...what should I expect. new [Re: peetyg]
      #5345518 - 07/31/12 03:18 PM Attachment (101 downloads)

Hi Peetyg

I cannot endorse a mallincam more than to show you this picture:

M27 from my friend's rooftop in Brooklynn Heights, NY, right across from lower Manhattan. Using a C8 operating at F4.5 and using a Lumicon Deepsky filter - a 28sec exposure on a CG-5 mount. You may be in Chicago, but I doubt anyone can compete with the light pollution from around these parts.

Cheers,
Al

P.S. I echo the prior posts - fuggetabout the Hyperstar.


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Mallincam in Chicago...what should I expect. new [Re: A. Viegas]
      #5348213 - 08/02/12 06:12 AM Attachment (63 downloads)

Quote:

Hi Peetyg - I cannot endorse a mallincam more than to show you this picture: M27 from my friend's rooftop in Brooklynn Heights, NY, right across from lower Manhattan. Using a C8 operating at F4.5 and using a Lumicon Deepsky filter - a 28sec exposure on a CG-5 mount. You may be in Chicago, but I doubt anyone can compete with the light pollution from around these parts. Cheers, Al. P.S. I echo the prior posts - fuggetabout the Hyperstar.


M27 is a brightish object for the Mallincam and trumps the EP every time [plus colour] as my M27 30s Lodestar shot below.

However from comments here under LP skies the latest cooled 'Extreme' needs dark skies for best results with the longer exposures the camera is capable of. Perhaps a step too far for suburbia

My approach from London via my Lodestar is to expose short of saturation [typically ~2m] and stack a few 60s subs AFTER removing the bright sky background from each sub A 5m stack [and often less] gets down to mag 18 stars and virtually ANY faint DSO targetted - and yes I get to see the subs in realtime - 5sec is enough to 'view' Stephens Quintet


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Digital Don
Carpal Tunnel
*****

Reged: 01/20/04

Loc: Manteno, IL
Re: Mallincam in Chicago...what should I expect. new [Re: nytecam]
      #5349169 - 08/02/12 06:28 PM Attachment (68 downloads)

Well, as long as we're doing M 27...

Don


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Jeff Smith
professor emeritus


Reged: 04/06/10

Loc: Chicago
Re: Mallincam in Chicago...what should I expect. new [Re: Digital Don]
      #5739461 - 03/17/13 07:22 PM

Inspiring thread! I have a VSS+ coming and I'm smack dab in the middle of Chicago...

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Dwight J
scholastic sledgehammer
*****

Reged: 05/14/09

Loc: Lethbridge, Alberta, Canada
Re: Mallincam in Chicago...what should I expect. new [Re: nytecam]
      #5740084 - 03/18/13 04:34 AM

I just upgraded from a VSS to an Extreme and no, you can use it quite easily from the suburbs as that is where I use mine most of the time. Appropriate light pollution filters attenuate the light pollution and I can easily get to 2.5 minutes or longer depending on where in the sky the object is. Just exploding another myth before it gets a life of it's own.

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Chris A
scholastic sledgehammer


Reged: 02/03/07

Loc: Toronto, Canada
Re: Mallincam in Chicago...what should I expect. new [Re: nytecam]
      #5740863 - 03/18/13 02:51 PM

Sorry Maurice but what are you talking about ??" However from comments here under LP skies the latest cooled 'Extreme' needs dark skies for best results with the longer exposures the camera is capable of. Perhaps a step too far for suburbia". Please STOP providing very misleading information to other's esp. people who are just starting out like the person who started this topic. I have been using as you very well know my MCX and now MCX2 for live broadcasting on all types of dim to very dim objects from a very large light polluted city and it works very well with the right equipment and operator settings!

Chris A
Astrogate


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Chris A
scholastic sledgehammer


Reged: 02/03/07

Loc: Toronto, Canada
Re: Mallincam in Chicago...what should I expect. [Re: Chris A]
      #5740928 - 03/18/13 03:16 PM Attachment (25 downloads)

I am sorry but this is what really makes me down when reading posts like this on this site. There are so many good people here providing lots of help and knowledge to other's and a simple answere to a simple question regarding light pollution and the usage of a MCX in a large city environment was all the was needed! Al simply was showing PettyG just what could be expected by using a Mallincam in a large light polluted city similar to his by using a single non-processed image. This now is a shame that it has starting to become an M27 showing off contest that Maurice has started which in a matter of fact shows a stacked processed image. I bet PettyG is not interested in stacking and post-processing but simple near real-time observing like Al's image is showing. If we are going to start showing images of M27 then I will add my single non-process M27 75 sec image using the MCX in a very heavy light polluted city.

Chris A
Astrogate


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