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Equipment Discussions >> Mounts

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pdfermat
scholastic sledgehammer
*****

Reged: 11/12/07

Loc: Wisconsin
This is good, right?
      #6136095 - 10/13/13 11:42 PM

Right now, I'm writing this message from my living room, while my rig is tracking/autoguiding ngc 457. I must say, it feels weird "doing astronomy" without actually being outside.

I'm using TeamViewer to control my netbook next to the scope, and everything is finally coming together. I think I'm getting good results with my autoguiding, but I'd like some of you seasoned veterans to take a look:



Those red and blue lines are barely moving from the center line, but that's what I'm shooting for, right? I used the EQMOD polar alignment procedure to get everything dialed in, and I think it has had a positive result on my tracking.

Anyway - I'm having a blast moving the scope around from inside and watching the finderscope view from PHD. As they say - if you're having fun, you must be doing something right!


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gillmj24
Post Laureate
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Reged: 12/06/05

Loc: PA
Re: This is good, right? new [Re: pdfermat]
      #6136104 - 10/13/13 11:51 PM

Pic doesn't show up for me but sounds like you're doing good.

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pdfermat
scholastic sledgehammer
*****

Reged: 11/12/07

Loc: Wisconsin
Re: This is good, right? new [Re: gillmj24]
      #6136122 - 10/14/13 12:03 AM

Hmm...I wonder why the pic doesn't show for you? I'm using photobucket, and haven't had troubles in the past. I'll go to a different device and see I it shows up for me.

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blueman
Photon Catcher
*****

Reged: 07/20/07

Loc: California
Re: This is good, right? new [Re: pdfermat]
      #6136138 - 10/14/13 12:16 AM

The flat line DEC shows the polar alignment is good.
The RA looks fine, but without a clue of how large the movements are it is hard to tell for sure. But the RMS value looks good.

Blueman


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orion69
scholastic sledgehammer


Reged: 05/09/10

Loc: Croatia
Re: This is good, right? new [Re: blueman]
      #6136238 - 10/14/13 02:41 AM

If stars are good then everything is OK. PHD graph doesn't mean much since you are probably using finder for guiding (if mount is Atlas EQ-G).

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Mike X.
scholastic sledgehammer


Reged: 06/28/10

Loc: Greece-Athens and Rome-Italy
Re: This is good, right? new [Re: orion69]
      #6136245 - 10/14/13 02:48 AM

I agree with Orion.
What focal lenght has the guide scope and at what FL do you immage?

This is what i get at 500mm guiding for example:

And gives me ok stars at 945mm FL immaging...Much depends also on what we think it is ok for us i guess.

If your stars are good than you don't have to worry

Edited by Mike X. (10/14/13 02:57 AM)


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pdfermat
scholastic sledgehammer
*****

Reged: 11/12/07

Loc: Wisconsin
Re: This is good, right? new [Re: Mike X.]
      #6136467 - 10/14/13 09:03 AM

The more I read about PHD, I see that the graph is more of a qualitative tool than quantitative. In my case, it seems I should have a pretty flat graph unless something is drastically wrong, since I'm guiding with an Orion 8x50 finder (162mm focal length).

When I do decide on an imaging camera, I'll be imaging through my c8 with a f/6.3 reducer, so the imaging focal length will be around 1200mm. As you say, the real test will be if stars are round. I guess I'll have to wait and see!!


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orlyandico
Post Laureate
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Reged: 08/10/09

Loc: Singapore
Re: This is good, right? new [Re: pdfermat]
      #6136562 - 10/14/13 10:14 AM

PHD2 allows you to input the focal length and pixel size in um. Hence it can display the guiding graphs directly in arc-seconds.

Much more edifying. And you can change the scale. If your scale is +/- 1" even a Mach1 has an alarmingly jagged curve.



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snommisbor
professor emeritus
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Reged: 06/15/09

Loc: Cedar Park, TX
Re: This is good, right? new [Re: Mike X.]
      #6136701 - 10/14/13 11:25 AM

I was thinking that was really flat myself. I have an EM 200 and feel I get good polar alignment but my DEC is never that flat. Mine looks more like yours. I guide with a ST 80 and SSAG. Although sometimes it will guide perfect and other times it will be so finicky. Can be frustrating.

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