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Equipment Discussions >> Electronically Assisted Astronomy

Pages: 1
John59
sage


Reged: 11/06/11

Loc: Round Rock,TX
New video setup new
      #5942955 - 06/27/13 11:34 AM Attachment (59 downloads)

I really needed something that was way more portable than my C11 and CGEM-DX.
With video, EQ is not always needed.
So I decided on Celestron's NexStar 8SE.
I am VERY happy with my decision.
I finally have it set up to the configuration I wanted.
I need to work on cable routing though and plan for potential cable wrap issues.

Here is the list:
SCOPE-NexStar 8SE
DEW SHIELD-Astrozap for the 8SE
FINDER SCOPE-Orion EZ finder Deluxe II
DIAGONAL-Orion Flip Mirror
EYEPIECE-20mm Eyepiece set par-focal with video cameras.
CAMERA-(in this photo) StellaCam III
DISPLAY-Orion Mini-DVR
VIBRATION PADS-Celestron
POWER SOURCE-Sears 22AH battery tank

The telescope is excellent and does really well with video cameras. This is quickly becoming my favorite set up.
It is quick and easy and works really well for those nights I do not have the time to fuss with the EQ set up.

Clear Skies to all!

Edited by John59 (06/27/13 11:40 AM)


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Raginar
Postmaster
*****

Reged: 10/19/10

Loc: Rapid CIty, SD
Re: New video setup new [Re: John59]
      #5942975 - 06/27/13 11:49 AM

That is very cool John.

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GlennLeDrew
Postmaster
*****

Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: New video setup new [Re: Raginar]
      #5943551 - 06/27/13 06:05 PM

How is the pointing accuracy? Might you be able to dispense with the flip mirror? Or do you have it in place so that you can also observe with an eyepiece?

I ask because the focus is currently a bit farther behind nominal, meaning your working f/ratio will be longer than f/10.

Have you tried a focal reducer? It's nice certainly for the larger objects, and has the additional benefit of reducing integration times.


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Larry F
Carpal Tunnel
*****

Reged: 05/24/04

Loc: Westchester, NY
Re: New video setup new [Re: GlennLeDrew]
      #5943732 - 06/27/13 08:06 PM

The flip mirror is obviously going to limit the altitude that the scope can attain, which will make you miss many wonderful objects. I agree with Glenn: focal reduction to f/5 with an inexpensive 0.5x reducer like the Antares and a regular diagonal. Rely on the scope's accurate go-to's. Objects will be brighter so you will need less integration.

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John59
sage


Reged: 11/06/11

Loc: Round Rock,TX
Re: New video setup new [Re: GlennLeDrew]
      #5943899 - 06/27/13 10:18 PM

Quote:

How is the pointing accuracy? Might you be able to dispense with the flip mirror? Or do you have it in place so that you can also observe with an eyepiece?

I ask because the focus is currently a bit farther behind nominal, meaning your working f/ratio will be longer than f/10.

Have you tried a focal reducer? It's nice certainly for the larger objects, and has the additional benefit of reducing integration times.



The pointing accuracy is pretty good but not always within the cameras FOV.
The nexStar series uses spur gearing and the backlash has to be accounted for and I do not always get it perfect.
The eyepiece helps to center for the camera.
As far as reducers, I have Celestron's 6.3, Meades 3.3 and Malincam's .5.
Depending on what I am observing/recording will depend on the reducer setup that night.
In this photo the Celestron 6.3 is in place.
Obviously this setup is not as good as my C11 on my CGEM-DX, however it is a great grab and go video setup.

Edited by John59 (06/27/13 10:22 PM)


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John59
sage


Reged: 11/06/11

Loc: Round Rock,TX
Re: New video setup new [Re: Larry F]
      #5943929 - 06/27/13 10:31 PM

Quote:

The flip mirror is obviously going to limit the altitude that the scope can attain, which will make you miss many wonderful objects. I agree with Glenn: focal reduction to f/5 with an inexpensive 0.5x reducer like the Antares and a regular diagonal. Rely on the scope's accurate go-to's. Objects will be brighter so you will need less integration.



Yes, the Flip Mirror limits the altitude.
I plan my observation around those limitations.
However if I really want to observe something that I cannot wait for the earths rotation to bring it within limitations, I will resort to the use of a diagonal.


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jchaller
Pooh-Bah


Reged: 05/29/08

Loc: Tenino, WA.
Re: New video setup new [Re: John59]
      #5943980 - 06/27/13 11:09 PM

Nice looking set-up, except for the cabling.

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John59
sage


Reged: 11/06/11

Loc: Round Rock,TX
Re: New video setup new [Re: jchaller]
      #5944159 - 06/28/13 02:19 AM

Quote:

Nice looking set-up, except for the cabling.



Yep, took care of that today with reusable cable clamps.


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shkong
super member
*****

Reged: 01/18/13

Loc: WA
Re: New video setup new [Re: John59]
      #5952113 - 07/02/13 09:19 PM

I also have Nexstar 8 SE.

As a starting point I consider using common Canon video camera(Vixia HFM41 which is light but with good sensitivity).

Could you give me some advice on using Canon video camera?


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T1R2
Carpal Tunnel


Reged: 06/11/13

Loc: NeverWhere, 35*N
Re: New video setup [Re: shkong]
      #5952514 - 07/03/13 04:23 AM

John, I would like to know how are the images with the AR?, I have the AR127 and was thinking about getting a astro-camera, Am I correct to assume that I wont need a focal reducer since the scope is F/6.5? also, How long is your normal exposure length?

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John59
sage


Reged: 11/06/11

Loc: Round Rock,TX
Re: New video setup new [Re: shkong]
      #5953050 - 07/03/13 12:36 PM

Quote:

I also have Nexstar 8 SE.

As a starting point I consider using common Canon video camera(Vixia HFM41 which is light but with good sensitivity).

Could you give me some advice on using Canon video camera?



I think you will find yourself disappointed with this camera.

The video cameras we use are either made for Astronomy ( Mallincams and StellaCams as examples) or modified security cameras (Samsung SCB-2000 and LnTech-300 as examples)
These have no lens.
They use C-mount eyepiece adapters making the telescope itself the lens.
They also have long integration times for gathering very low light that is necessary for astronomy use.
A really good starter video camera would be the Samsung SCB-2000 as they are easily modified (removing the IR filter) and perform very well for about $100.

The camera you are proposing does not have any of the abilities pointed out above.
It's best capability is"0.1 lux (Low Light mode, 1/2 sec shutter speed).
Compared to Samsung "Minimum illumination of 0.0001 lux at f1/.2 (color sens-up) and "512x (8 sec.)sens-up support".


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John59
sage


Reged: 11/06/11

Loc: Round Rock,TX
Re: New video setup new [Re: T1R2]
      #5953291 - 07/03/13 02:49 PM

Quote:

John, I would like to know how are the images with the AR?, I have the AR127 and was thinking about getting a astro-camera, Am I correct to assume that I wont need a focal reducer since the scope is F/6.5? also, How long is your normal exposure length?




Loaded question

The ES AR152 is an excellent telescope for both long exposure and video.
I have not used any reducers for mine using 1/2" format sensors.

As far a how long an exposure is, well that depends on many things such as what object, how faint it is, sensitivity of the sensor and aperture of the telescope and your sky light pollution condition.
A lot to consider but each one has a critical role.
The reality is it can be anywhere from a few seconds to several hours of photon collection.

For Video the ES AR152 does really well with the Samsung SCB-2000 and my StellaCam III.

I personally greatly prefer Astro Video as it does not require auto-guiding and the time to "see" something generally stays within the "seconds" realm.

For examples take a look at my Flickr Sets for CCD Set (long Exposure) and Astro Video set and the lynTech 300 Set for the video.
Look for the ones that have the ES AR152 listed in the description/comments.

Link:
http://www.flickr.com/photos/96288941@N00/sets/

If the link does not work then search in Flickr for "Hillfisher".


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