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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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Ian Smith
,
Bruce Waddington
5
2:25 PM
Ascom Remote Server
with 3 scopes, we now have 3 RB Focus panels and we've discovered that the RB Focus Ascom driver
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Ascom Remote Server
with 3 scopes, we now have 3 RB Focus panels and we've discovered that the RB Focus Ascom driver
2:25 PM
mshe...@gmail.com
, …
Brian Valente
13
1:13 PM
Pulse width, Expopsure time, and Strain Wave Mounts
Mike It's common for alternative approaches to polar alignment differ in their reported alignment
unread,
Pulse width, Expopsure time, and Strain Wave Mounts
Mike It's common for alternative approaches to polar alignment differ in their reported alignment
1:13 PM
Sushant Acharekar
,
Brian Valente
3
1:23 AM
Seelking help to improve my guiding error
Hello Brian Here are the details Scope : Stellarvue SVX090T (540mm , however plate solve says its a
unread,
Seelking help to improve my guiding error
Hello Brian Here are the details Scope : Stellarvue SVX090T (540mm , however plate solve says its a
1:23 AM
drre...@gmail.com
,
Brian Valente
2
Feb 11
Unable to open PHD2 v2.6.14
>>>I'm trying to install the latest version but my computer says it contains a virus and
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Unable to open PHD2 v2.6.14
>>>I'm trying to install the latest version but my computer says it contains a virus and
Feb 11
Brad Thomas
, …
Michael Yasko
4
Feb 11
Can't set up PHP2 with QHY5III585M camera
Yes, after considerable googling I learned PHD2 is 32 bit. I was able to fix the problem with a 32
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Can't set up PHP2 with QHY5III585M camera
Yes, after considerable googling I learned PHD2 is 32 bit. I was able to fix the problem with a 32
Feb 11
umasscrew39
,
Bruce Waddington
5
Feb 11
keep losing star trying to calibrate
The upper limit for focal length in the current version of PHD2 is 10000 mm, an the wizard will
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keep losing star trying to calibrate
The upper limit for focal length in the current version of PHD2 is 10000 mm, an the wizard will
Feb 11
NY2KW
,
Bruce Waddington
4
Feb 10
Zwo - 2 identical cameras - Which One?
Well, sure, ancient e-mail domains for ancient people like me. <g>. But at least it isn't
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Zwo - 2 identical cameras - Which One?
Well, sure, ancient e-mail domains for ancient people like me. <g>. But at least it isn't
Feb 10
Franklin Marek
,
Brian Valente
3
Feb 10
Guiding just stops sending guide pulses and no error in PHD2
Hi Brian, Thanks for the very quick response!! I will do exactly that (and try EQMOD) to rule out
unread,
Guiding just stops sending guide pulses and no error in PHD2
Hi Brian, Thanks for the very quick response!! I will do exactly that (and try EQMOD) to rule out
Feb 10
Tom van Peer
,
Brian Valente
8
Feb 10
Using PEC on the mount with PHD2
>>>please send this question to the group and I can answer there. We try to keep everything
unread,
Using PEC on the mount with PHD2
>>>please send this question to the group and I can answer there. We try to keep everything
Feb 10
Franklin Marek
Feb 10
Guide pulses just stop with no error in PHD2
Hi, link to debug log: https://openphdguiding.org/logs/dl/PHD2_logs_gKRg.zip Equipment: NEQ6pro mount
unread,
Guide pulses just stop with no error in PHD2
Hi, link to debug log: https://openphdguiding.org/logs/dl/PHD2_logs_gKRg.zip Equipment: NEQ6pro mount
Feb 10
Suzanne Beers
, …
Tom van Peer
6
Feb 8
Camera didn't capture 1sec frame within 16sec, disconnected
I once had a 'new' USB cable that worked but turned my camera into a USB2 device and made my
unread,
Camera didn't capture 1sec frame within 16sec, disconnected
I once had a 'new' USB cable that worked but turned my camera into a USB2 device and made my
Feb 8
Jim H
,
Brian Valente
2
Feb 7
Star Magnitude / Image Planning with Stellarium and OAG
Jim The preference is a correctly configured auto-selection of guidestar. it's a common
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Star Magnitude / Image Planning with Stellarium and OAG
Jim The preference is a correctly configured auto-selection of guidestar. it's a common
Feb 7
Ajneet Singh
,
Bruce Waddington
4
Feb 7
heq5 pro mount not dithering in dec and causing walking noise
The combination of short exposure times and poor polar alignment could have reduced the visibility of
unread,
heq5 pro mount not dithering in dec and causing walking noise
The combination of short exposure times and poor polar alignment could have reduced the visibility of
Feb 7
hugh...@gmail.com
,
Brian Valente
3
Feb 6
RA axis stopped. PHD2 or Mount?
Hi Brian, Yes, that's fine. Not sure were the issue was. I ran a session last night and had no
unread,
RA axis stopped. PHD2 or Mount?
Hi Brian, Yes, that's fine. Not sure were the issue was. I ran a session last night and had no
Feb 6
Sanjeev Joshi
,
Brian Valente
5
Feb 5
iOptron CEM 70 EC2 - quick steps
ok ty. I believe these are relative not absolute, but I will read thru. TY, Sanjeev On Thursday,
unread,
iOptron CEM 70 EC2 - quick steps
ok ty. I believe these are relative not absolute, but I will read thru. TY, Sanjeev On Thursday,
Feb 5
Sanjeev Joshi
, …
Bruce Waddington
5
Feb 3
Quick question -- binning of ZWO 2600 MC Pro for guiding test
Thanks for posting this, Sanjeev. Many people make the mistake of thinking that through-the-mount
unread,
Quick question -- binning of ZWO 2600 MC Pro for guiding test
Thanks for posting this, Sanjeev. Many people make the mistake of thinking that through-the-mount
Feb 3
Gianluca Rossi
, …
Bryan
3
Feb 2
PHD2 calibration and harmonic drives
Gianluca The most efficient path for your friend to provide the logs is below. It is an easy way to
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PHD2 calibration and harmonic drives
Gianluca The most efficient path for your friend to provide the logs is below. It is an easy way to
Feb 2
TrevorW
,
Steve Lawrence
2
Feb 2
QHY 5L-II-C camera
I use the native QHY drivers for my QHY 5L -II-M and has been working well. Check the QHY website for
unread,
QHY 5L-II-C camera
I use the native QHY drivers for my QHY 5L -II-M and has been working well. Check the QHY website for
Feb 2
Richard Brown
,
Brian Valente
2
Feb 1
ASIAIR AND PHD2
Richard ASIAir does not use PHD2. It uses it's own version adapted from the PHD2 open source. Any
unread,
ASIAIR AND PHD2
Richard ASIAir does not use PHD2. It uses it's own version adapted from the PHD2 open source. Any
Feb 1
Keith Mombourquette
,
Bruce Waddington
3
Jan 31
Elongated Stars for Part of Every Night
Thanks Bruce. Very helpful. On Saturday, January 31, 2026 at 5:27:27 PM UTC-5 bw_m...@earthlink.net
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Elongated Stars for Part of Every Night
Thanks Bruce. Very helpful. On Saturday, January 31, 2026 at 5:27:27 PM UTC-5 bw_m...@earthlink.net
Jan 31
Michael Yasko
, …
Bruce Waddington
20
Jan 30
Getting started
OK, Thanks Bruce, much appreciated. I'll look into that later today. I'm changing rotors and
unread,
Getting started
OK, Thanks Bruce, much appreciated. I'll look into that later today. I'm changing rotors and
Jan 30
Bob Hughes
, …
Bruce Waddington
4
Jan 28
PHD2 looses lock on selected guide star.
You can also read the User Guide section on this topic so you understand how things work: https://
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PHD2 looses lock on selected guide star.
You can also read the User Guide section on this topic so you understand how things work: https://
Jan 28
Szymon Kierzenkowski
,
Brian Valente
5
Jan 28
high frequency Ra movment
i will try and work on all that and check the results on my next clear night środa, 28 stycznia 2026
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high frequency Ra movment
i will try and work on all that and check the results on my next clear night środa, 28 stycznia 2026
Jan 28
G Ha
,
Brian Valente
2
Jan 26
PHD2 Guide Log sample of excellent guiding
Gary I don't think that will be instructive. You can't really compare someone else's
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PHD2 Guide Log sample of excellent guiding
Gary I don't think that will be instructive. You can't really compare someone else's
Jan 26
Tom van Peer
,
Brian Valente
3
Jan 25
CEM26 guiding issues
Hi Brian, Thanks for all the advice. I once again opened up my mount yesterday, to get rid of some
unread,
CEM26 guiding issues
Hi Brian, Thanks for all the advice. I once again opened up my mount yesterday, to get rid of some
Jan 25
G Ha
,
Brian Valente
5
Jan 24
Help to with improving my RA RMS guiding numbers.
Gary Segment 14 was on the opposite side of pier and seemed to be the outlier by far. All the others
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Help to with improving my RA RMS guiding numbers.
Gary Segment 14 was on the opposite side of pier and seemed to be the outlier by far. All the others
Jan 24
Kevin McQuown
, …
Brian Valente
10
Jan 21
Guiding help
Thanks for the update Kevin. It happens, and fortunately ZWO is stepping up to address it. On Wed,
unread,
Guiding help
Thanks for the update Kevin. It happens, and fortunately ZWO is stepping up to address it. On Wed,
Jan 21
Jake Grimsrud
,
Bruce Waddington
5
Jan 21
Great PA but Poor Guiding Performance
We'll be happy to help you out to the extent we can. I need to correct one ridiculous thing I
unread,
Great PA but Poor Guiding Performance
We'll be happy to help you out to the extent we can. I need to correct one ridiculous thing I
Jan 21
Robert Anderson
, …
Bruce Waddington
3
Jan 21
ToupTek G3M178M Guide camera periodically, stops in the middle of a imaging run
One other thing to check right away, something the logs might not tell us: are you running with the
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ToupTek G3M178M Guide camera periodically, stops in the middle of a imaging run
One other thing to check right away, something the logs might not tell us: are you running with the
Jan 21
Jay
,
Bruce Waddington
2
Jan 20
Calibration issue
What kind of a mount is this? What are the other details of your setup in terms of instrument load?
unread,
Calibration issue
What kind of a mount is this? What are the other details of your setup in terms of instrument load?
Jan 20