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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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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
Lou B
, …
Aris Pope
15
Jun 20
Poor guide performance with Ioptron CEM60 and CEM70 mounts
I use and OAG as well, really helps. What dec algorithm are you using? Aris On Sat, Jun 20, 2026, 8:
unread,
Poor guide performance with Ioptron CEM60 and CEM70 mounts
I use and OAG as well, really helps. What dec algorithm are you using? Aris On Sat, Jun 20, 2026, 8:
Jun 20
FrankW
,
Bruce Waddington
2
Jun 17
Linux - PHD2 Message Visibility
The appearance of the alert message isn't controlled by PHD2, it's a behavior of the
unread,
Linux - PHD2 Message Visibility
The appearance of the alert message isn't controlled by PHD2, it's a behavior of the
Jun 17
Wei-Hao Wang
,
Bruce Waddington
2
Jun 17
dither every few exposures
Hi Wei-Hao. This really isn't the sort of thing we want to do and I think you'd be better off
unread,
dither every few exposures
Hi Wei-Hao. This really isn't the sort of thing we want to do and I think you'd be better off
Jun 17
Eric Giraud
, …
Bruce Waddington
7
Jun 14
Unstable guiding despite a good night
Sorry, perhaps I misinterpreted this statement: " I am using a Pegasus Astro rotator that I have
unread,
Unstable guiding despite a good night
Sorry, perhaps I misinterpreted this statement: " I am using a Pegasus Astro rotator that I have
Jun 14
kjm...@gmail.com
, …
Mike Ales
11
Jun 14
PHD2 was working with my Touptek camera, but now it can't find it
Thanks. The issue arises if my laptop has nothing connected to it but the ToupTek, which is an
unread,
PHD2 was working with my Touptek camera, but now it can't find it
Thanks. The issue arises if my laptop has nothing connected to it but the ToupTek, which is an
Jun 14
Chris Woodhouse
, …
Bruce Waddington
6
Jun 13
RMS pixel - arcsec conversion suggestion
That is very true, especially if the DEC guiding is turned off. I often ask folks to turn off DEC
unread,
RMS pixel - arcsec conversion suggestion
That is very true, especially if the DEC guiding is turned off. I often ask folks to turn off DEC
Jun 13
Jean Baptiste Marquette
, …
Brian Valente
6
Jun 12
Issue on Dec guiding
>>> a gift! But I upgraded it to Gemini 2, with the appropriate motors and gears. if it pre-
unread,
Issue on Dec guiding
>>> a gift! But I upgraded it to Gemini 2, with the appropriate motors and gears. if it pre-
Jun 12
Quark Coder (Quark)
, …
Brian Valente
10
Jun 10
How to make guiding more stable and better?
Phil I will contact you off list. It's not an official release but i can make it available to you
unread,
How to make guiding more stable and better?
Phil I will contact you off list. It's not an official release but i can make it available to you
Jun 10
NY2KW
, …
Bruce Waddington
11
Jun 2
Newbie - Understanding RA Variability
As we've suggested, I think you're past the point where staring at the guide logs is useful.
unread,
Newbie - Understanding RA Variability
As we've suggested, I think you're past the point where staring at the guide logs is useful.
Jun 2