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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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Robert Anderson
, …
Bruce Waddington
4
10:52 PM
PHD Guiding keeps stopping during image runs
There's a sizable Trouble-Shooting section of the User Guide that describes how to trouble-shoot
unread,
PHD Guiding keeps stopping during image runs
There's a sizable Trouble-Shooting section of the User Guide that describes how to trouble-shoot
10:52 PM
Bob Hughes
,
Brian Valente
2
4:51 PM
Loosing Lock on guide star.
Bob Please upload your guidelogs: https://openphdguiding.org/getting-help/ On Fri, Apr 24, 2026 at 1:
unread,
Loosing Lock on guide star.
Bob Please upload your guidelogs: https://openphdguiding.org/getting-help/ On Fri, Apr 24, 2026 at 1:
4:51 PM
William Schubert
,
Ken H
3
Apr 21
ZWO ASI 174 won't connect to PHD
Oh and get the latest drivers Native and ASCOM - https://www.zwoastro.com/software/ On Tuesday, April
unread,
ZWO ASI 174 won't connect to PHD
Oh and get the latest drivers Native and ASCOM - https://www.zwoastro.com/software/ On Tuesday, April
Apr 21
Ross Salinger
, …
Yannick
6
Apr 21
Alpaca and PHD
Sorry to interfect, what's the roadmap like for native Alpaca support in PHD2? On Sunday, April 5
unread,
Alpaca and PHD
Sorry to interfect, what's the roadmap like for native Alpaca support in PHD2? On Sunday, April 5
Apr 21
Michel Meunier
, …
Brian Valente
6
Apr 20
Transfer calibration data between two PC
Thanks again, the guiding was perfect without a new calibration Michel Le dimanche 19 avril 2026 à 23
unread,
Transfer calibration data between two PC
Thanks again, the guiding was perfect without a new calibration Michel Le dimanche 19 avril 2026 à 23
Apr 20
Don Waters
, …
Michael Waring
3
Apr 20
CGEM TRACKING does not resume after Drift Align
Maybe Don means "guiding does not restart", not "tracking" ? There are only two
unread,
CGEM TRACKING does not resume after Drift Align
Maybe Don means "guiding does not restart", not "tracking" ? There are only two
Apr 20
Gregory
,
Bruce Waddington
5
Apr 19
autoguiding with star adventurer 2i
Bruce, Thanks for the info. I had all the cables hooked up correctly but couldn't figure out to
unread,
autoguiding with star adventurer 2i
Bruce, Thanks for the info. I had all the cables hooked up correctly but couldn't figure out to
Apr 19
pauls...@gmail.com
, …
Mike Ales
20
Apr 16
problem with streaks on display
if you have isolated it to a computer my guess would be it is something with the USB ports or USB
unread,
problem with streaks on display
if you have isolated it to a computer my guess would be it is something with the USB ports or USB
Apr 16
Jay
, …
Bruce Waddington
15
Apr 14
Manual Guide not moving mount
I took the advice here: revisited mount mechanics, dark libraries, balance, dither settings. I seem
unread,
Manual Guide not moving mount
I took the advice here: revisited mount mechanics, dark libraries, balance, dither settings. I seem
Apr 14
John Rightten
,
Bruce Waddington
5
Apr 14
SX-AO PHD2 connectivity options
I think we need to clarify how this stuff works. When PHD2 is connected to the mount directly - via
unread,
SX-AO PHD2 connectivity options
I think we need to clarify how this stuff works. When PHD2 is connected to the mount directly - via
Apr 14
Chris Pendred
,
Bruce Waddington
2
Apr 13
Better guiding one side of the meridian
I don't think there's much that can be said about this. Once you're guiding behavior is
unread,
Better guiding one side of the meridian
I don't think there's much that can be said about this. Once you're guiding behavior is
Apr 13
Krzysztof
, …
Geoffrey Frost
7
Apr 9
very bad quiding during last sesions /Ioptron CEM70/
Give me the weekend to sort some funds out. I would like to go ahead. Does it all function in its
unread,
very bad quiding during last sesions /Ioptron CEM70/
Give me the weekend to sort some funds out. I would like to go ahead. Does it all function in its
Apr 9
Luca Bartolucci
, …
Brian Valente
7
Apr 9
Poor guiding graph on EQ6-R PRO
Thank you so much for your help. What I try to do is have an RMS of about 0.5 - 0.6", because
unread,
Poor guiding graph on EQ6-R PRO
Thank you so much for your help. What I try to do is have an RMS of about 0.5 - 0.6", because
Apr 9
Brian Valente
, …
prsharma
13
Apr 6
Re: [open-phd-guiding] New to guiding and Unable to guide accurately ... please help
Hello Bryan/Brian/Bruce: Quick update. Just heard back from Sky Watcher support. The checked the
unread,
Re: [open-phd-guiding] New to guiding and Unable to guide accurately ... please help
Hello Bryan/Brian/Bruce: Quick update. Just heard back from Sky Watcher support. The checked the
Apr 6
Chris Pendred
,
Brian Valente
2
Apr 5
QHY5ii Camera and Slow 15s image refreshes
Thanks for the update Chris On Sun, Apr 5, 2026 at 4:48 AM Chris Pendred <chris.p...@gmail.com
unread,
QHY5ii Camera and Slow 15s image refreshes
Thanks for the update Chris On Sun, Apr 5, 2026 at 4:48 AM Chris Pendred <chris.p...@gmail.com
Apr 5
Geoffrey Frost
Apr 1
Camera picture issues
This is a new install on a new PC I purchased a while back. Windows 11 Nina EQ8 150ED Guide camera:
unread,
Camera picture issues
This is a new install on a new PC I purchased a while back. Windows 11 Nina EQ8 150ED Guide camera:
Apr 1
landarch283
,
Brian Valente
2
Apr 1
Recent poor guiding
landarch283 please upload a link to your logs using the built-in log uploader. instructions here:
unread,
Recent poor guiding
landarch283 please upload a link to your logs using the built-in log uploader. instructions here:
Apr 1
Liudas B
, …
Brian Valente
5
Mar 30
Problems with Mount / Guiding
Will do that Brian, thank you very much and appreciate it! 2026 m. kovo 30 d., pirmadienis 08:50:38
unread,
Problems with Mount / Guiding
Will do that Brian, thank you very much and appreciate it! 2026 m. kovo 30 d., pirmadienis 08:50:38
Mar 30
Ventura Valderrábano Ornedo
, …
Bruce Waddington
7
Mar 29
Help needed with my new Pegasus Astro NYX-88 mount
I don't really see any improvement, the RA tracking is still pretty terrible. Here's what the
unread,
Help needed with my new Pegasus Astro NYX-88 mount
I don't really see any improvement, the RA tracking is still pretty terrible. Here's what the
Mar 29
mshe...@gmail.com
, …
Bruce Waddington
7
Mar 29
Polar Alignment Discrepancy Between PHD2 and Sharpcap?
PHD2 is only estimating polar alignment error by measuring the rate of drift in declination. It
unread,
Polar Alignment Discrepancy Between PHD2 and Sharpcap?
PHD2 is only estimating polar alignment error by measuring the rate of drift in declination. It
Mar 29
Dominique DANIEL
,
Bruce Waddington
3
Mar 27
North count = South count x 15
Thanks Bruce I will check polar alignment and balance. I've joined Rob (GSS) Who advised to
unread,
North count = South count x 15
Thanks Bruce I will check polar alignment and balance. I've joined Rob (GSS) Who advised to
Mar 27
G Ha
,
Bruce Waddington
2
Mar 23
PHD2 Log Viewer for Mac OS Tahow 26.3.1(a) not working
You can report your issue here: https://github.com/agalasso/phdlogview The LogViewer tool isn't
unread,
PHD2 Log Viewer for Mac OS Tahow 26.3.1(a) not working
You can report your issue here: https://github.com/agalasso/phdlogview The LogViewer tool isn't
Mar 23
Akshay Nathan
,
Bruce Waddington
3
Mar 23
SVBONY 905C Camera fails to communicate with iOptron Skyguider Pro Mount over ST4
I had downloaded both the native and ascom drivers from their respective websites, but I may have
unread,
SVBONY 905C Camera fails to communicate with iOptron Skyguider Pro Mount over ST4
I had downloaded both the native and ascom drivers from their respective websites, but I may have
Mar 23
Mike Ales
,
Bruce Waddington
5
Mar 23
Ioptron CEM70 RA oscillation and spikes with OAG and a bit longer focal lengths
Ok, I guess I made the bad assumption that the short exposure times and hyper-aggressive guiding were
unread,
Ioptron CEM70 RA oscillation and spikes with OAG and a bit longer focal lengths
Ok, I guess I made the bad assumption that the short exposure times and hyper-aggressive guiding were
Mar 23
Tim Stevenson
,
Bruce Waddington
3
Mar 22
Poor RA Guiding
I think we're probably reaching the limit for how much more we can tell you. Guiding data is only
unread,
Poor RA Guiding
I think we're probably reaching the limit for how much more we can tell you. Guiding data is only
Mar 22
Jack Bernstein
,
Bruce Waddington
3
Mar 22
Tracking degenerates
Bruce, Thanks for taking your time to look at this. I appreciate all your comments. A major issue I
unread,
Tracking degenerates
Bruce, Thanks for taking your time to look at this. I appreciate all your comments. A major issue I
Mar 22
Calvin Kliensdale
,
Brian Valente
4
Mar 21
Mach1 RA oscillations
great thanks On Sat, Mar 21, 2026 at 7:09 PM Calvin Kliensdale <onlyclo...@gmail.com>
unread,
Mach1 RA oscillations
great thanks On Sat, Mar 21, 2026 at 7:09 PM Calvin Kliensdale <onlyclo...@gmail.com>
Mar 21
Suzanne Beers
,
Bruce Waddington
6
Mar 21
Abort mid-sequence
I'll see what kind of lemonade I can make out of the data... Thanks for all your help!! On Sat,
unread,
Abort mid-sequence
I'll see what kind of lemonade I can make out of the data... Thanks for all your help!! On Sat,
Mar 21
NoahHD
, …
areinhardt784
6
Mar 21
Persistent RA Oscillations on HEQ5 Pro (Belt Mod + New Bearings)
Thanks Brian, I'll try that. Sent from my Galaxy -------- Original message --------From: Brian
unread,
Persistent RA Oscillations on HEQ5 Pro (Belt Mod + New Bearings)
Thanks Brian, I'll try that. Sent from my Galaxy -------- Original message --------From: Brian
Mar 21
Jeff M
,
Bruce Waddington
5
Mar 21
Star Lost Events
Bruce, Thanks for your help i was able to get 9 hours of unobstructed guiding with the changes. Do
unread,
Star Lost Events
Bruce, Thanks for your help i was able to get 9 hours of unobstructed guiding with the changes. Do
Mar 21