Author Topic: PoleMaster PoleMaster, How Close to the NCP?  (Read 549 times)

Chris Goldsby

  • Active Astronomer
  • ***
  • Posts: 128
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
PoleMaster PoleMaster, How Close to the NCP?
« on: December 29, 2017, 05:23:03 AM »
I am considering purchasing a PoleMaster and I'm wondering if it is more accurate than the method that I am currently using for polar alignment.

How close do you usually get to the NCP using a PoleMaster?



haigeoredis

  • Active Astronomer
  • ***
  • Posts: 122
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #1 on: December 30, 2017, 04:10:58 AM »
Maybe 2 minutes. It's clear the accuracy is limited by my lousy seeing, when I get to to the final stage the red and the green thingies you're supposed to superimpose are jumping around. Merger for me means trying to get the average of the jumps to match.

PhD2 lists polar alignment error in the guiding assistant. The values it reports jump around in similar fashion. 2 minutes is my guess of the average of those.

I can see the rated 30 seconds being achievable in steady air. My 2 minutes is good enough that DEC needs few corrections from autoguiding. It's better than I ever did with drift alignment, maybe I just wasn't patient enough.

Jessie Forbes

  • Active Astronomer
  • ***
  • Posts: 121
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #2 on: December 30, 2017, 04:23:42 AM »
Hey Bob,

I can get that close with PHD2 drift but it takes a while. The NCP is only 18* above the horizon for me, well it should be anyways, atmospheric diffraction changes that by about 3* or so.

I think I will stick to my current method for now and drift align. I think I'll buy a new saddle instead.

Thanks

ruesonecrai

  • Active Astronomer
  • ***
  • Posts: 130
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #3 on: January 04, 2018, 04:46:33 PM »
You can use sharpcap which is free.  On my Cgem I have gotten about 1' using sharpcap. Also I find Celesfron's ASPA to be good too.  Just two nights ago I used it on my CPC and after 4 iterations I had my best ever ASPA confirmed with PHD guideassistant st 1.9'.   Both of these are free
Al

Devon Dank

  • Active Astronomer
  • ***
  • Posts: 122
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #4 on: January 04, 2018, 07:10:06 PM »
I downloaded Sharpcap. I'll give it a try once the clouds clear out of the way.

Thanks

Rahul Sanders

  • Active Astronomer
  • ***
  • Posts: 126
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #5 on: January 11, 2018, 02:30:56 AM »
It work well enough in one shot for me that I don't see any significant rotation in my images for say 1.5 hours of subs. Stars are generally pin point for the 5 minute subs I have tried so far.
For me the biggest gain is that you can do the alignment quickly without having to bend down and such to use the polar scope.

hutualyli

  • Active Astronomer
  • ***
  • Posts: 105
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #6 on: January 11, 2018, 11:09:30 AM »
Quote
You can use sharpcap which is free. On my Cgem I have gotten about 1' using sharpcap. Also I find Celesfron's ASPA to be good too. Just two nights ago I used it on my CPC and after 4 iterations I had my best ever ASPA confirmed with PHD guideassistant st 1.9'. Both of these are free
Al

Haven't tried Sharpcap yet, but for *my* mounts, Polemaster easily beats ASPA (not to mention not needing to contort my back). My experience is similar to Bob's--the big factor with PM is the seeing. In the "lazy, hazy, crazy" days of summer, I would expect to achieve under 1' polar alignment.

rentireacen

  • Active Astronomer
  • ***
  • Posts: 109
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #7 on: January 13, 2018, 01:07:57 PM »
Quote
For me the biggest gain is that you can do the alignment quickly without having to bend down and such to use the polar scope.


Will Sharpcap account for Atmospheric Defraction? I live at about 18* north latitude.

At this latitude the polar scope is at a comfortable angle and contortions are not needed to view through it, but my PA will be about 3* off the actual NCP!

I try to make adjustments through the scope but drift aligning is still required.

plurcontitear

  • Active Astronomer
  • ***
  • Posts: 127
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #8 on: January 15, 2018, 07:59:47 PM »
Sharpcap does not yet cover defraction.  he is working on it.   meanwhile download it and try it out.

http://www.sharpcap....s/beta-versions

note there are only 11 days left before it becomes a paid for software.  so try it now and see if you like it.

Al

adectisun

  • Active Astronomer
  • ***
  • Posts: 129
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #9 on: January 21, 2018, 01:03:51 AM »
Quote
Hey Bob,

I can get that close with PHD2 drift but it takes a while. The NCP is only 18* above the horizon for me, well it should be anyways, atmospheric diffraction changes that by about 3* or so.

I think I will stick to my current method for now and drift align. I think I'll buy a new saddle instead.

Thanks

PoleMaster could account for the atmospheric refraction. I have been able to achieve polar alignment as close to 13 arcseconds to the NCP in just 5'minuted. There is no occasion now I won't start my session without the PoleMaster.

adtalhalyg

  • Active Astronomer
  • ***
  • Posts: 115
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #10 on: January 23, 2018, 12:12:00 PM »
Quote
Quote

Hey Bob,

I can get that close with PHD2 drift but it takes a while. The NCP is only 18* above the horizon for me, well it should be anyways, atmospheric diffraction changes that by about 3* or so.

I think I will stick to my current method for now and drift align. I think I'll buy a new saddle instead.

Thanks

PoleMaster could account for the atmospheric refraction. I have been able to achieve polar alignment as close to 13 arcseconds to the NCP in just 5'minuted. There is no occasion now I won't start my session without the PoleMaster.
Robin Lee, at what latitude do you do your imaging?

David Knoll

  • Active Astronomer
  • ***
  • Posts: 113
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #11 on: January 31, 2018, 03:41:17 AM »
I'm typically between 1-2 but have seen 30 secs on a good night. Either way, it makes little difference to guiding.

seucamthepo

  • Active Astronomer
  • ***
  • Posts: 119
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #12 on: January 31, 2018, 09:47:08 AM »
Quote
Quote

Quote

Hey Bob,

I can get that close with PHD2 drift but it takes a while. The NCP is only 18* above the horizon for me, well it should be anyways, atmospheric diffraction changes that by about 3* or so.

I think I will stick to my current method for now and drift align. I think I'll buy a new saddle instead.

Thanks

PoleMaster could account for the atmospheric refraction. I have been able to achieve polar alignment as close to 13 arcseconds to the NCP in just 5'minuted. There is no occasion now I won't start my session without the PoleMaster.
Robin Lee, at what latitude do you do your imaging?
His store's in Hong Kong, you can look it up  OR a random point from Google Map says 22 North ish.

Coco Moten

  • Active Astronomer
  • ***
  • Posts: 132
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #13 on: February 03, 2018, 12:00:20 AM »
OK...... first time using a PoleMaster to align my old Mountain Instruments MI-250 PushTo mount tonight.

It took me 3 hours to do it.

2 hours and 50 minutes waitin' for the clouds to clear, and 10 minutes to get aligned!

I love this thing!

Terrance Station

  • Active Astronomer
  • ***
  • Posts: 113
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: PoleMaster PoleMaster, How Close to the NCP?
« Reply #14 on: February 08, 2018, 12:52:43 AM »
The past weekend we had two nights of clear skies. My Polemaster on the MX+ produced accuracy (as measured by TheSkyX's polar alignment routines) of 1.0 - 1.7 arcminutes and 1.2 - 1.7 arcminutes.

Each PM session took about 3 minutes to complete.