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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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Report group
0 selected
myk...@gmail.com
,
Bruce Waddington
2
Jul 25
Subject: Reproducible crash (0xc0000005) in PHD2 during camera looping with custom Alpaca camera server
I don't think the problem is with PHD2. I just tested this on my Windows laptop using the
unread,
Subject: Reproducible crash (0xc0000005) in PHD2 during camera looping with custom Alpaca camera server
I don't think the problem is with PHD2. I just tested this on my Windows laptop using the
Jul 25
Aidan Bonicker
2
Jul 25
Problem with subframe guiding
Forgot to add this https://openphdguiding.org/logs/dl/PHD2_logs_4TmW.zip On Saturday, July 25, 2026
unread,
Problem with subframe guiding
Forgot to add this https://openphdguiding.org/logs/dl/PHD2_logs_4TmW.zip On Saturday, July 25, 2026
Jul 25
Fearless Leader
, …
Don Waters
15
Jul 25
"Star lost - low HFD"
TOM If you want to use Claude, try this: 1. Open PhD2 manual in a tab on browser 2. Open PhD2 logfile
unread,
"Star lost - low HFD"
TOM If you want to use Claude, try this: 1. Open PhD2 manual in a tab on browser 2. Open PhD2 logfile
Jul 25
Walter ZAMBOTTI
Jul 23
SW SA GTI good news story.
I have had the GTI since pre order days (So a while). For over a year I have been trying to use PHD2
unread,
SW SA GTI good news story.
I have had the GTI since pre order days (So a while). For over a year I have been trying to use PHD2
Jul 23
knak
,
Brian Valente
4
Jul 20
Backlash comp threshold window
20-35ms is effectively near zero backlash. Use the guiding assistant and measure your backlash. If
unread,
Backlash comp threshold window
20-35ms is effectively near zero backlash. Use the guiding assistant and measure your backlash. If
Jul 20
Glenn Mitchell
,
Bruce Waddington
2
Jul 20
Guiding Goes Wonky After Meridian Flip
I think the ZWO mounts require 'Reverse Dec output after meridian flip' to be 'On'.
unread,
Guiding Goes Wonky After Meridian Flip
I think the ZWO mounts require 'Reverse Dec output after meridian flip' to be 'On'.
Jul 20
JEFFREY HOLLY BEVAN
, …
Sonny Edmonds 2
9
Jul 20
Guide sensor on ASI2600MC duo
It's happened to me, so I point that out. If PHD is accidentally trying to use your main camera
unread,
Guide sensor on ASI2600MC duo
It's happened to me, so I point that out. If PHD is accidentally trying to use your main camera
Jul 20
Bob Powell
,
Bruce Waddington
2
Jul 17
Huge oscillations in RA near zenith
Hi Bob. I think we need to back up a bit and re-characterize the problem. First, your guiding is more
unread,
Huge oscillations in RA near zenith
Hi Bob. I think we need to back up a bit and re-characterize the problem. First, your guiding is more
Jul 17
spokes...@gmail.com
,
Bruce Waddington
2
Jul 17
Dither question
For random-mode dithering, each random move is relative to the current lock-point which, in turn, is
unread,
Dither question
For random-mode dithering, each random move is relative to the current lock-point which, in turn, is
Jul 17
sarg314
,
Bruce Waddington
2
Jul 15
ZWO ASI220 guide camera 12-bits vs 8-bits
It can depend on what driver you're using - native or ASCOM - and whether it can operate in
unread,
ZWO ASI220 guide camera 12-bits vs 8-bits
It can depend on what driver you're using - native or ASCOM - and whether it can operate in
Jul 15
Mupanga Mwanakatwe
, …
Bruce Waddington
3
Jul 15
Poor Guiding Immediately After Meridian Flip – EQ6-R Pro + EdgeHD 8 + OAG
Also, your guide camera is running in 16-bit mode which is good, but you've set your
unread,
Poor Guiding Immediately After Meridian Flip – EQ6-R Pro + EdgeHD 8 + OAG
Also, your guide camera is running in 16-bit mode which is good, but you've set your
Jul 15
John Hague
,
Brian Valente
6
Jul 13
AP1150AE / PHD2 / NINA dither settle failures despite normal guiding
The good news is if this is the issue, it's easily fixed. The guiding assistant run will measure
unread,
AP1150AE / PHD2 / NINA dither settle failures despite normal guiding
The good news is if this is the issue, it's easily fixed. The guiding assistant run will measure
Jul 13
Keith Steffens
, …
Bruce Waddington
4
Jul 13
PPEC Setting Discrepency
Bruce, That's the discrepancy. It clearly shows 230 s in PHD with auto adjust unchecked. But in
unread,
PPEC Setting Discrepency
Bruce, That's the discrepancy. It clearly shows 230 s in PHD with auto adjust unchecked. But in
Jul 13
Don Waters
,
Michael Waring
3
Jul 12
PPEC
I just found it. I did not see that there was a drop down there. Thanks very much. Don On Sunday,
unread,
PPEC
I just found it. I did not see that there was a drop down there. Thanks very much. Don On Sunday,
Jul 12
Derek Fage
,
Bruce Waddington
3
Jul 11
Strange problem with Wave 150i Guiding
Ah! I had checked logs to see if it had been caused by a Meridian Flip but didn't see one (I hadn
unread,
Strange problem with Wave 150i Guiding
Ah! I had checked logs to see if it had been caused by a Meridian Flip but didn't see one (I hadn
Jul 11
Lee David
,
Bruce Waddington
2
Jul 11
Calibration Step
It's still there, still works. If it's disabled, you are probably trying to use a
unread,
Calibration Step
It's still there, still works. If it's disabled, you are probably trying to use a
Jul 11
Don Waters
,
Brian Valente
3
Jul 9
Logfile
Thanks. Maybe not. Here they are again. https://openphdguiding.org/logs/dl/PHD2_logs_LWwu.zip The
unread,
Logfile
Thanks. Maybe not. Here they are again. https://openphdguiding.org/logs/dl/PHD2_logs_LWwu.zip The
Jul 9
Jim Waters
, …
Dale Ghent
7
Jul 8
Upgraded from an ASI120mm to ASI220mm – Maybe a Problem & Questions
Thanks for the education and reply's everybody. Jim On Wed, Jul 8, 2026 at 4:22 PM Dale Ghent
unread,
Upgraded from an ASI120mm to ASI220mm – Maybe a Problem & Questions
Thanks for the education and reply's everybody. Jim On Wed, Jul 8, 2026 at 4:22 PM Dale Ghent
Jul 8
Eren Gencer
, …
Brian Valente
4
Jul 8
Juwei 17 guiding issues
>>> Despite all that, I still can't get properly round, well-defined guide stars, round
unread,
Juwei 17 guiding issues
>>> Despite all that, I still can't get properly round, well-defined guide stars, round
Jul 8
Ian Smith
, …
Bryan
7
Jul 6
Ascom Remote Server
Have you considered a second focus panel or asking RB to modify the driver? Bryan On Monday, July 6,
unread,
Ascom Remote Server
Have you considered a second focus panel or asking RB to modify the driver? Bryan On Monday, July 6,
Jul 6
Aidan Bonicker
, …
Bruce Waddington
10
Jul 6
Recommended settings for my mount as well as reverse dec problem
Hey Bruce, I agree that there probably isn't much more you can do. Thank you very much for your
unread,
Recommended settings for my mount as well as reverse dec problem
Hey Bruce, I agree that there probably isn't much more you can do. Thank you very much for your
Jul 6
rsole
2
Jul 4
make is failing with some errors that do not make sense to me
Tried using open source only and make is completing successfully. On Sunday, 28 June 2026 at 3:17:38
unread,
make is failing with some errors that do not make sense to me
Tried using open source only and make is completing successfully. On Sunday, 28 June 2026 at 3:17:38
Jul 4
Mustafa Said Cay
,
Bruce Waddington
2
Jul 3
Harmonic mount asymmetric PE, PPEC optimization
Hi Said. I really can't see what you're worried about here. The total guiding RMS for your
unread,
Harmonic mount asymmetric PE, PPEC optimization
Hi Said. I really can't see what you're worried about here. The total guiding RMS for your
Jul 3
Richard Brown
,
Brian Valente
2
Jun 29
Calibration
Hi Richard Can you clarify your equipment setup? I assume this is an oag on some style of reflector
unread,
Calibration
Hi Richard Can you clarify your equipment setup? I assume this is an oag on some style of reflector
Jun 29
Xavier Peillon
, …
Brian Valente
10
Jun 28
PHD2 NINA meridan flip issue
Thanks for the update Xavier On Sat, Jun 27, 2026 at 10:30 PM Xavier Peillon <xav.thegreenthumb@
unread,
PHD2 NINA meridan flip issue
Thanks for the update Xavier On Sat, Jun 27, 2026 at 10:30 PM Xavier Peillon <xav.thegreenthumb@
Jun 28
Gianluca Rossi
, …
Brian Valente
5
Jun 27
RA poor tracking
I managed to adjust the RA gear mesh by releasing a little bit the meshing between the worm and the
unread,
RA poor tracking
I managed to adjust the RA gear mesh by releasing a little bit the meshing between the worm and the
Jun 27
NY2KW
, …
Dale Ghent
12
Jun 26
Patchy Clouds - Terrible Guiding - Could we have a poor rms alert?
> On Jun 25, 2026, at 22:38, Bruce Waddington <bw_m...@earthlink.net> wrote: > > I
unread,
Patchy Clouds - Terrible Guiding - Could we have a poor rms alert?
> On Jun 25, 2026, at 22:38, Bruce Waddington <bw_m...@earthlink.net> wrote: > > I
Jun 26
Richard Brown
,
Bruce Waddington
3
Jun 21
Problem Calibrating On Single Star With Hi-Resolution Spectroscope
In order to make any progress with this, you will need to correct a number of operational mistakes.
unread,
Problem Calibrating On Single Star With Hi-Resolution Spectroscope
In order to make any progress with this, you will need to correct a number of operational mistakes.
Jun 21
Arie
, …
Bruce Waddington
3
Jun 21
Clearing Backlash Issue & High Guiding Error
In order to work on this problem, I suggest doing a couple of things: 1. Increase the guide speed in
unread,
Clearing Backlash Issue & High Guiding Error
In order to work on this problem, I suggest doing a couple of things: 1. Increase the guide speed in
Jun 21
Suzanne Beers
, …
Brian Valente
13
Jun 21
Calibration error - too far from equator with SGP v4.5 upgrade
glad to hear it's working well, thanks for the update On Sun, Jun 21, 2026 at 4:42 AM Suzanne
unread,
Calibration error - too far from equator with SGP v4.5 upgrade
glad to hear it's working well, thanks for the update On Sun, Jun 21, 2026 at 4:42 AM Suzanne
Jun 21