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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
.
Mark all as read
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Dominique DANIEL
,
Bruce Waddington
3
7:11 AM
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
7:11 AM
Brian Valente
, …
Bryan
12
Mar 23
Re: [open-phd-guiding] New to guiding and Unable to guide accurately ... please help
Pratul Good luck with the service at SW. I hope it works out. Brysn On Monday, March 23, 2026 at 5:22
unread,
Re: [open-phd-guiding] New to guiding and Unable to guide accurately ... please help
Pratul Good luck with the service at SW. I hope it works out. Brysn On Monday, March 23, 2026 at 5:22
Mar 23
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
mshe...@gmail.com
, …
Tommy M
4
Mar 21
Polar Alignment Discrepancy Between PHD2 and Sharpcap?
I usually have a similar discrepancy. However, when SharpCap shows an improvement, so does PHD2 GA. I
unread,
Polar Alignment Discrepancy Between PHD2 and Sharpcap?
I usually have a similar discrepancy. However, when SharpCap shows an improvement, so does PHD2 GA. I
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
prsharma
Mar 20
Trouble getting Sky Watcher AL-EQ55i Pro to guide properly
Hello: I am new to astrophotography and guiding and having trouble getting my mount to track
unread,
Trouble getting Sky Watcher AL-EQ55i Pro to guide properly
Hello: I am new to astrophotography and guiding and having trouble getting my mount to track
Mar 20
Suzanne Beers
,
Bruce Waddington
8
Mar 20
Mid-sequence abort - PHD2 error ASCOM driver disconnect
Okay thank you...I will read through the guide! Everything worked well again last night!! On Fri, Mar
unread,
Mid-sequence abort - PHD2 error ASCOM driver disconnect
Okay thank you...I will read through the guide! Everything worked well again last night!! On Fri, Mar
Mar 20
Graham Smith
,
Brian Valente
5
Mar 20
Guiding issues in hot weather
Alas it was hot again tonight (still winter?), thanks to Exxonmobil, Shell, Texaco et al and guiding
unread,
Guiding issues in hot weather
Alas it was hot again tonight (still winter?), thanks to Exxonmobil, Shell, Texaco et al and guiding
Mar 20
Tim Stevenson
, …
Bruce Waddington
5
Mar 18
Large Jump After Star Lost Events
Just disable the feature. I don't know why you would want to fiddle around with the mechanics any
unread,
Large Jump After Star Lost Events
Just disable the feature. I don't know why you would want to fiddle around with the mechanics any
Mar 18
Don Waters
, …
Tom van Peer
5
Mar 16
NEW OAG AND ASI174MINI
Don, Just my $0.02: I would like to encourage you to read the different PHD2 docs, they are really
unread,
NEW OAG AND ASI174MINI
Don, Just my $0.02: I would like to encourage you to read the different PHD2 docs, they are really
Mar 16
Ali
,
Bruce Waddington
2
Mar 16
Suggestion: profile chooser
I don't think this makes any sense for a number of reasons: 1. We don't do modal dialogs in
unread,
Suggestion: profile chooser
I don't think this makes any sense for a number of reasons: 1. We don't do modal dialogs in
Mar 16
Tim Stevenson
, …
Brian Valente
8
Mar 15
Trouble with Backlash on Rebuilt EQ6R Pro Mount
Tim Generally periodic error correction can be handled either by the 1. mount, 2. by phd, or 3. both.
unread,
Trouble with Backlash on Rebuilt EQ6R Pro Mount
Tim Generally periodic error correction can be handled either by the 1. mount, 2. by phd, or 3. both.
Mar 15
Michael Schneider
,
Brian Valente
4
Mar 9
New to PHD2 with NINA Losmandy G11 struggles
Great - let us know how it goes, send the logs when you do this On Mon, Mar 9, 2026 at 12:55 PM
unread,
New to PHD2 with NINA Losmandy G11 struggles
Great - let us know how it goes, send the logs when you do this On Mon, Mar 9, 2026 at 12:55 PM
Mar 9
Philippe ANGERS
, …
Brian Valente
26
Mar 9
Pegasus Astro NYX-88 mount, also an issue with calibration, to be continued
Hi Philippe, We are happy to assist you. While the problems we discussed began with your observations
unread,
Pegasus Astro NYX-88 mount, also an issue with calibration, to be continued
Hi Philippe, We are happy to assist you. While the problems we discussed began with your observations
Mar 9
Frederic Ruciak
,
Bruce Waddington
3
Mar 8
What happens if a rotator is connected AFTER PHD2 was launched?
Thanks Bruce, you confirm what I most probably triggered and I will standardized the connection
unread,
What happens if a rotator is connected AFTER PHD2 was launched?
Thanks Bruce, you confirm what I most probably triggered and I will standardized the connection
Mar 8
t_t2o
,
Bruce Waddington
2
Mar 7
After 17.0 sec the camera has not completed a 2.0 sec exposure,
I realize this is irritating but it doesn't seem critical - you had a total of 3 camera
unread,
After 17.0 sec the camera has not completed a 2.0 sec exposure,
I realize this is irritating but it doesn't seem critical - you had a total of 3 camera
Mar 7
Sushant Acharekar
, …
Bruce Waddington
6
Mar 6
Changing Targets didn't flip my calibration data on am5n
You don't need to check your settings regarding the rotator - it was absolutely connected to PHD2
unread,
Changing Targets didn't flip my calibration data on am5n
You don't need to check your settings regarding the rotator - it was absolutely connected to PHD2
Mar 6
Philippe ANGERS
, …
Brian Valente
10
Mar 4
Help needed with my new Pegasus Astro NYX-88 mount, also an issue with calibration
Hello, I did, but they were unable to help me, they didn't give any explanation when I asked them
unread,
Help needed with my new Pegasus Astro NYX-88 mount, also an issue with calibration
Hello, I did, but they were unable to help me, they didn't give any explanation when I asked them
Mar 4
Ventura Valderrábano Ornedo
, …
Bruce Waddington
5
Mar 1
Help needed with my new Pegasus Astro NYX-88 mount
Thank you very much, Bruce. The mount was purchased last January, so I will contact the distributor
unread,
Help needed with my new Pegasus Astro NYX-88 mount
Thank you very much, Bruce. The mount was purchased last January, so I will contact the distributor
Mar 1
mshe...@gmail.com
, …
Brian Valente
17
Feb 26
Pulse width, Expopsure time, and Strain Wave Mounts
I just ran NINA's 3 Point Polar Alignment. Interestingly, it found the error of about a degree (-
unread,
Pulse width, Expopsure time, and Strain Wave Mounts
I just ran NINA's 3 Point Polar Alignment. Interestingly, it found the error of about a degree (-
Feb 26
Tom van Peer
,
Brian Valente
2
Feb 26
High-frequency star motion
I would treat high frequency RMS as more of a guideline - this is an approximate measurement of your
unread,
High-frequency star motion
I would treat high frequency RMS as more of a guideline - this is an approximate measurement of your
Feb 26
Chris Pendred
, …
Brian Valente
14
Feb 25
Guiding Consistency
Chris here are a few screenshots, hopefully they are helpful - you can ignore the variable exposure
unread,
Guiding Consistency
Chris here are a few screenshots, hopefully they are helpful - you can ignore the variable exposure
Feb 25
rsf...@rsfotografia.com
, …
PartlyC
17
Feb 24
Plate solving with PHD2...
I found it in the NINA Plugins = PlateSolvePlus Will test it these days. Now we need a Plugin in
unread,
Plate solving with PHD2...
I found it in the NINA Plugins = PlateSolvePlus Will test it these days. Now we need a Plugin in
Feb 24