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Astrophotography and Sketching >> DSLR & Digital Camera Astro Imaging & Processing

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Moey
super member


Reged: 01/23/08

(Faster)ccddrift using backyard eos for astrotrac? new
      #5546453 - 11/29/12 11:33 PM

Was wondering, rather than using the ccd drift method for polar aligning astrotrac (image for 2 minutes, 1 minute forward next minute rewind), would it be quicker to do this using backyard eos illuminated reticle screen feature? As in, rather than take an image, do fast drift for 1 minute than reverse it while watching the star drift on the screen and make adjustments live while viewing it?

Hope I make sense


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guyroch
Vendor (BackyardEOS)
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Reged: 01/22/08

Loc: Under the clouds!
Re: (Faster)ccddrift using backyard eos for astrotrac? new [Re: Moey]
      #5546519 - 11/30/12 12:36 AM

Yep, that should work, in fact a have several users doing it as you described it

The difficult part with an astrotrac is the ability to center the star smack in the middle where the crosshairs are. To compensate, BYE offers the ability to move the crosshair reticulated to where the star is; not ideal but functional.

Hope this helps,

Guylain


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Moey
super member


Reged: 01/23/08

Re: (Faster)ccddrift using backyard eos for astrotrac? new [Re: guyroch]
      #5546537 - 11/30/12 12:53 AM

Quote:

Yep, that should work, in fact a have several users doing it as you described it

The difficult part with an astrotrac is the ability to center the star smack in the middle where the crosshairs are. To compensate, BYE offers the ability to move the crosshair reticulated to where the star is; not ideal but functional.

Hope this helps,

Guylain




Hi Guylian,

Wow thanks for the quick response

Is it difficult to center because of the ball head on top of the astrotrac?


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mikotoy
super member


Reged: 06/20/12

Re: (Faster)ccddrift using backyard eos for astrotrac? [Re: Moey]
      #5547108 - 11/30/12 12:27 PM

I used to do it the way you mention it using BYE, but found that it took even longer than capturing the image.

The issue you end up having is that there is no good sense of how large the angular deviation is and may end up over correcting. I made very small changes to avoid over correction which took greater time vs waiting for the 2 minute cycle to complete and have a far more accurate reading.


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Tonk
Postmaster
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Reged: 08/19/04

Loc: Leeds, UK, 54N
Re: (Faster)ccddrift using backyard eos for astrotrac? new [Re: mikotoy]
      #5547446 - 11/30/12 04:01 PM

But this is always the case with any form of drift aligntment - the closer you get to alignment the longer it takes to find out what the error is.

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