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Charlie HeinAdministrator
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D.A.R.V (Drift Alignment by Robert Vice)
      #5608861 - 01/06/13 05:15 PM

D.A.R.V (Drift Alignment by Robert Vice)

By Robert Vice


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Scott in NCAdministrator
80mm Refractor Fanatic
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Reged: 03/05/05

Loc: NC
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Charlie Hein]
      #5609029 - 01/06/13 06:58 PM

Very nice! Thanks for sharing that information, Robert.

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highfnum
Carpal Tunnel
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Reged: 09/06/06

Loc: NE USA
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Scott in NC]
      #5609050 - 01/06/13 07:07 PM

nice i going to try it

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Takashi
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Reged: 11/22/05

Loc: Stockholm, Sweden
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: highfnum]
      #5609703 - 01/07/13 07:44 AM

Really cool! Will try this as soon as possible.

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Littlegreenman
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Reged: 05/09/05

Loc: Southern California
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Takashi]
      #5610387 - 01/07/13 02:56 PM

I don't do astrophotography, so I don't need this level of alignment. But, I do appreciate clever thinking!

LGM


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Raginar
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Reged: 10/19/10

Loc: Rapid CIty, SD
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Littlegreenman]
      #5611174 - 01/07/13 11:41 PM

Robert,

You mention that the corrections would be different for a GEM and I guess I don't understand why that is so. Can you clarify?

BTW this is probably the best example I've found. The pictures really clarified what I'm looking for from my image.

Chris


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Traveler
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Reged: 08/19/07

Loc: The Netherlands
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Raginar]
      #5611373 - 01/08/13 05:23 AM

Quote:

Robert,

You mention that the corrections would be different for a GEM and I guess I don't understand why that is so. Can you clarify?

Chris




+1


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Doc Bob
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Reged: 02/27/09

Loc: Maryland, USA
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Traveler]
      #5612480 - 01/08/13 06:37 PM

Thanks Robert,
I keep reading posts/articles referencing "drift alignment". I understand what it is but not having a GEM go-to mount, I havn't really paid any attention to technique. This does help lots! I eventually will go the rout of a GEM mount for my refractors.

Good viewing!
Bob


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Maverick199
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Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Doc Bob]
      #5613061 - 01/09/13 01:34 AM

That is an excellent idea, thanks. Hope someone or I try this out with a GEM and report results. Only wish I had dark skies.

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Lightning
sage


Reged: 07/04/10

Loc: Canberra, Australia
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Maverick199]
      #5615041 - 01/10/13 08:32 AM

Cannot for the life of me thinking why GEMs should be adjusted any differently to a fork. Perhaps he means the actual adjustment knobs will be in a different place? No idea.

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Raginar
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Reged: 10/19/10

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Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Lightning]
      #5616209 - 01/10/13 08:22 PM

Lightning,

I can't think of why it would be different either; minus the actual motions of the GEM. But you should figure that out when your "V" is bigger or smaller based on how you move it.

This is the best example I've seen though. I'm really glad he put it together since i was hoping to learn this technique this year.


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hcsceo
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Reged: 10/14/09

Loc: Austin, TX
Re: D.A.R.V (Drift Alignment by Robert Vice)h new [Re: Raginar]
      #5616585 - 01/11/13 01:16 AM

Man I wish I had read this before I started my imaging run tonight. I'm definitely going to give it a go. I've been using PHD but this looks much easier.

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Jerry Hubbell
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Reged: 02/16/09

Loc: Locust Grove, VA, USA
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Charlie Hein]
      #5618106 - 01/11/13 10:09 PM

This method has been around for a long time. I first discovered it several years ago as described by Dr James Hall. For a thorough explanation see:

http://www.minorplanet.info/ObsGuides/Misc/ccdpolaralignment.htm

I also describe this method in my book and provide a complete procedure also in chapter 12.

http://www.amazon.com/Scientific-Astrophotography-Professional-Practical-Astr...


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Raginar
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Reged: 10/19/10

Loc: Rapid CIty, SD
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Jerry Hubbell]
      #5618314 - 01/12/13 12:45 AM

Hey Jerry,

Your explanation is good too! Thank you for posting the follow-up information.


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Jerry Hubbell
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Reged: 02/16/09

Loc: Locust Grove, VA, USA
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Raginar]
      #5619964 - 01/12/13 10:50 PM

Thanks Chris,

I meant to post the link to the original source... Jim Hall
http://www.physiology.uci.edu/hall/polar.htm


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astrnmr
journeyman
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Reged: 03/22/12

Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Jerry Hubbell]
      #5645287 - 01/26/13 11:29 PM

Hey all, thanks for the comments. Sorry it has taken so long to respond. GEM mounts function slightly different in respects to the OTA positions as well as the need to "flip" the OTA direction once it is moves from East to West. When this occurs, your image is now reversed. Therefore, depending on whether or not you "flip" the OTA over, your adjustments may or may not change. A fork mounted scope never reverses the image while moving from E to W and eliminates the possibility of having to reverse your adjustments.

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Lightning
sage


Reged: 07/04/10

Loc: Canberra, Australia
Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: astrnmr]
      #5653549 - 01/31/13 02:36 AM

Thanks Jerry, that makes sense!

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corduroy
member


Reged: 12/30/13

Re: D.A.R.V (Drift Alignment by Robert Vice) new [Re: Lightning]
      #6489723 - 04/26/14 11:59 AM

Hey all, do you think this method will work on a curved bolt barn door tracker like this? I believe the barn door tracker is rotating along the RA axis. I have my barn door mounted to a pan/tilt head on a a tripod so I can adjust the azimuth and altitude albeit not precisely.



The DARV instructions states to move the mount to the west and then to the east. Is moving W or E the same as rotating about the RA axis CW or CCW?


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