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Welcome to the
Open PHD Guiding
(PHD2) forum, telescope guiding software for astro-photographers.
To get help with PHD2, please upload your log files - here's how:
How to ask for help with PHD2
.
If you are new to PHD2, we urge you to read the
documentation
and
follow these tips:
Use the forum search tools - most questions have been answered many times
Read and follow the
Best Practices Guide
Use the New-Profile-Wizard to define and manage your equipment configurations
Avoid making changes to guiding parameters without knowing exactly what they do
After you get a good calibration run and a Guiding Assistant Run, per the Best Practices, run the
Baseline Assessment
Forum guidelines for vendors
.
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Jeff Ratino
,
Bruce Waddington
3
8:25 AM
Major issues with my Tracking/Guiding
Thank you. Did a quick test this morning before work. I only had it imaging one target last night. So
unread,
Major issues with my Tracking/Guiding
Thank you. Did a quick test this morning before work. I only had it imaging one target last night. So
8:25 AM
Kevin Wisdom
4:53 AM
Massive guiding excursions with new mount
Hi, I have recently replaced my reliable Celestron AVX with a Sky-Watcher NEQ6, for which I have
unread,
Massive guiding excursions with new mount
Hi, I have recently replaced my reliable Celestron AVX with a Sky-Watcher NEQ6, for which I have
4:53 AM
Maxastro59
,
Bruce Waddington
4
3:46 AM
Bad guiding after many years
Thanks Bruce, your suspicion actually seems the most reasonable, although this setup has been in
unread,
Bad guiding after many years
Thanks Bruce, your suspicion actually seems the most reasonable, although this setup has been in
3:46 AM
David Wilden
,
Jens Scheidtmann
2
3:31 AM
Suggested change to Dithering Algorithm
Dear Dave, Note that „systematic random walk“ is kind of a misconception. It is a random walk: The
unread,
Suggested change to Dithering Algorithm
Dear Dave, Note that „systematic random walk“ is kind of a misconception. It is a random walk: The
3:31 AM
Jerel smith
Nov 3
Getting PHD2 to work with ZWO ASI camera and iOptron HEM 27 EC mount
I am putting together a refractor-scope system, and trying to use PHD2 to control an iOptron HEM 27
unread,
Getting PHD2 to work with ZWO ASI camera and iOptron HEM 27 EC mount
I am putting together a refractor-scope system, and trying to use PHD2 to control an iOptron HEM 27
Nov 3
Aidan Bonicker
2
Nov 3
Problems Guiding with the Star Adventurer GTI
Here is the complete log for my guiding tonight. Rms was around 1.5-2.0 On Mon, Nov 3, 2025 at 9:25
unread,
Problems Guiding with the Star Adventurer GTI
Here is the complete log for my guiding tonight. Rms was around 1.5-2.0 On Mon, Nov 3, 2025 at 9:25
Nov 3
Malcolm Park
,
Dale Ghent
3
Nov 3
ZWO CAA rotator
awesome! thank you. On Monday, 3 November 2025 at 10:43:39 UTC-5 da...@elemental.org wrote: You have
unread,
ZWO CAA rotator
awesome! thank you. On Monday, 3 November 2025 at 10:43:39 UTC-5 da...@elemental.org wrote: You have
Nov 3
sar...@gmail.com
, …
Bruce Waddington
15
Nov 2
Meridian flip with OAG - is there a way?
Bryan: OK, I'm looking into installing the previous version of the alpaca simulator. I looked
unread,
Meridian flip with OAG - is there a way?
Bryan: OK, I'm looking into installing the previous version of the alpaca simulator. I looked
Nov 2
David Wilden
, …
steve
18
Nov 2
Unexpected long term drifts in position after each dither is applied
Good modifications. But... One of the main movement inducing items is the barrel into which the guide
unread,
Unexpected long term drifts in position after each dither is applied
Good modifications. But... One of the main movement inducing items is the barrel into which the guide
Nov 2
George Hart
,
richar...@bigpond.com
2
Oct 31
Backlash compensation: Advanced Settings vs. Guiding Assistant values
Hi George If you took all your images from one night and turned them into a “video”, eg play them in
unread,
Backlash compensation: Advanced Settings vs. Guiding Assistant values
Hi George If you took all your images from one night and turned them into a “video”, eg play them in
Oct 31
Marco Malziotti
,
Bruce Waddington
8
Oct 30
Celestron advanced VX - Suggested parameters to improve backlash
The operational changes you've made definitely help us to see what's going on - so, well done
unread,
Celestron advanced VX - Suggested parameters to improve backlash
The operational changes you've made definitely help us to see what's going on - so, well done
Oct 30
Bob Hughes
,
Bruce Waddington
2
Oct 27
Profile Wizard
In the Connect Equipment window, click on the 'Manage Profiles' button/drop-down list, choose
unread,
Profile Wizard
In the Connect Equipment window, click on the 'Manage Profiles' button/drop-down list, choose
Oct 27
David Wilden
2
Oct 26
Unexpected systematic drift while guiding
I've attached the guide logs for the two runs and here is the link to the debug logs. https://
unread,
Unexpected systematic drift while guiding
I've attached the guide logs for the two runs and here is the link to the debug logs. https://
Oct 26
gary
,
Bruce Waddington
4
Oct 26
Paramount MX+ Guiding Woes..
I can see a few problems that will need to be sorted out. First, look at the 2 back-back Guiding
unread,
Paramount MX+ Guiding Woes..
I can see a few problems that will need to be sorted out. First, look at the 2 back-back Guiding
Oct 26
Kenn Hopkins
, …
Bruce Waddington
5
Oct 25
Can this be Improved?
Ok, now I understand what you were looking at. The Guiding Assistant doesn't actually measure
unread,
Can this be Improved?
Ok, now I understand what you were looking at. The Guiding Assistant doesn't actually measure
Oct 25
Krzysztof
,
Bruce Waddington
3
Oct 25
problem with guiding
Dear Bruce, Thank you for the suggestions and I apologize for the lack of information. However,
unread,
problem with guiding
Dear Bruce, Thank you for the suggestions and I apologize for the lack of information. However,
Oct 25
umasscrew39
, …
Bruce Waddington
4
Oct 24
Strange error message
This isn't much of a "resolution". This message should never appear and when it does,
unread,
Strange error message
This isn't much of a "resolution". This message should never appear and when it does,
Oct 24
Dick C
,
Brian Valente
2
Oct 24
Error message: "can't begin guide because guide already in progress"
DIck please use PHD's log uploader to upload all logs and post them: https://openphdguiding.org/
unread,
Error message: "can't begin guide because guide already in progress"
DIck please use PHD's log uploader to upload all logs and post them: https://openphdguiding.org/
Oct 24
Kevin Quin
, …
Brian Valente
9
Oct 23
Communication problem between PHD2 and Nitecrawler rotator?
Glad to hear you got it sorted Kevin, thanks for the update On Thu, Oct 23, 2025 at 7:21 PM Kevin
unread,
Communication problem between PHD2 and Nitecrawler rotator?
Glad to hear you got it sorted Kevin, thanks for the update On Thu, Oct 23, 2025 at 7:21 PM Kevin
Oct 23
Paul Wilson
,
Brian Valente
8
Oct 23
From great to inop
PHD reports what's available to it, so yes it's probably worth having the obs staff make sure
unread,
From great to inop
PHD reports what's available to it, so yes it's probably worth having the obs staff make sure
Oct 23
Jack Bernstein
, …
Brian Valente
8
Oct 22
Guiding goes crazy after meridian flip
The problem is your mount does not reliably and consistently report pier side, and when that happens
unread,
Guiding goes crazy after meridian flip
The problem is your mount does not reliably and consistently report pier side, and when that happens
Oct 22
Don Waters
Oct 21
Logs. RMS displayed on screen is different from RMS in log
Looking at these, I see I need to get a better polar alignment, although I did do a drift and it was
unread,
Logs. RMS displayed on screen is different from RMS in log
Looking at these, I see I need to get a better polar alignment, although I did do a drift and it was
Oct 21
M S
,
Brian Valente
4
Oct 19
Can’t find where to change Settling Parameters.
You should post Nina questions to the Nina discord. It looks to me like your settle time is probably
unread,
Can’t find where to change Settling Parameters.
You should post Nina questions to the Nina discord. It looks to me like your settle time is probably
Oct 19
Gianluca Rossi
, …
Bruce Waddington
7
Oct 19
Log results
Your original post was a bit vague on the details so we missed the fact that the night's guiding
unread,
Log results
Your original post was a bit vague on the details so we missed the fact that the night's guiding
Oct 19
G-Man 007
, …
Brian Valente
13
Oct 18
Celestron Unified Driver 6.1.7350, PHD2, and NexStar 8SE with Wedge
Edmund Run it and see On Sat, Oct 18, 2025 at 1:19 AM G-Man 007 <golp...@gmail.com> wrote: To
unread,
Celestron Unified Driver 6.1.7350, PHD2, and NexStar 8SE with Wedge
Edmund Run it and see On Sat, Oct 18, 2025 at 1:19 AM G-Man 007 <golp...@gmail.com> wrote: To
Oct 18
Don Waters
, …
Bruce Waddington
3
Oct 14
Log results
Declination drift reverses direction depending on the details of how you are mis-aligned on the
unread,
Log results
Declination drift reverses direction depending on the details of how you are mis-aligned on the
Oct 14
Don Waters
,
Bruce Waddington
2
Oct 14
logs from last night
The PHD2 estimates of polar alignment error come from measures of drift in declination. We have no
unread,
logs from last night
The PHD2 estimates of polar alignment error come from measures of drift in declination. We have no
Oct 14
Rita Castilho
,
Bruce Waddington
9
Oct 12
apparent mount disconnect
That's probably a good option. Just be sure you create a new PHD2 profile for the EQMOD
unread,
apparent mount disconnect
That's probably a good option. Just be sure you create a new PHD2 profile for the EQMOD
Oct 12
Luca Bartolucci
, …
steve
7
Oct 12
Trouble getting stable guiding graphs in PHD2
Hi I don't think a change of software will help, but a dismantle, clean and regrease will.
unread,
Trouble getting stable guiding graphs in PHD2
Hi I don't think a change of software will help, but a dismantle, clean and regrease will.
Oct 12
Jeff Kelly
,
Bruce Waddington
2
Oct 11
Recalbrating
PHD2 was trying to tell you what was wrong with this alert: 20:47:55.497 00.000 28328 Alert: PHD2 is
unread,
Recalbrating
PHD2 was trying to tell you what was wrong with this alert: 20:47:55.497 00.000 28328 Alert: PHD2 is
Oct 11