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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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Alan Moore
, …
Bruce Waddington
6
4:24 PM
Problems with a new mount
Yes, I was frustrated by that until I found the small "settings" icon right beside the
unread,
Problems with a new mount
Yes, I was frustrated by that until I found the small "settings" icon right beside the
4:24 PM
Ed M
,
Bruce Waddington
4
Dec 1
Dark library keeps disappearing
Just to avoid a lot of wasted time and frustration - you need to use the built-in 'Upload Logs
unread,
Dark library keeps disappearing
Just to avoid a lot of wasted time and frustration - you need to use the built-in 'Upload Logs
Dec 1
Mark McComiskey
,
Bruce Waddington
2
Nov 30
Recent Version
It's just a minor efficiency optimization. For non-encoder mounts, the CA works pretty hard to be
unread,
Recent Version
It's just a minor efficiency optimization. For non-encoder mounts, the CA works pretty hard to be
Nov 30
Kevin Quin
, …
Bruce Waddington
13
Nov 30
Communication problem between PHD2 and Nitecrawler rotator?
This sounds like a bug in the Nightcrawler ASCOM driver. Have you raised the issue with them? Regards
unread,
Communication problem between PHD2 and Nitecrawler rotator?
This sounds like a bug in the Nightcrawler ASCOM driver. Have you raised the issue with them? Regards
Nov 30
Kevin Wisdom
,
Bruce Waddington
14
Nov 30
Massive guiding excursions with new mount
Ok, let us know how it works out. For future reference, when the CA result is less than acceptable,
unread,
Massive guiding excursions with new mount
Ok, let us know how it works out. For future reference, when the CA result is less than acceptable,
Nov 30
macd...@yahoo.com
,
bw_m...@earthlink.net
3
Nov 29
Copying profiles and dark libraries
Thank you, Bruce, I just saw the Import/ Export functions this morning. On Friday, November 28, 2025
unread,
Copying profiles and dark libraries
Thank you, Bruce, I just saw the Import/ Export functions this morning. On Friday, November 28, 2025
Nov 29
Richard Scott
, …
Dale Ghent
10
Nov 29
Guiding on a Geostationary Satellite
An encoder mount with RA and Declination tracking rates set to values derived by the satellite's
unread,
Guiding on a Geostationary Satellite
An encoder mount with RA and Declination tracking rates set to values derived by the satellite's
Nov 29
Alois Regl
, …
Michael Waring
3
Nov 27
Svbony 205 not recognized in phd2
I believe this is a video-only camera, it doesn't deliver single frames required for guiding
unread,
Svbony 205 not recognized in phd2
I believe this is a video-only camera, it doesn't deliver single frames required for guiding
Nov 27
Paul Wilson
, …
Bryan
5
Nov 26
Guiding assitant
Paul PHD2 reports "up to date" with respect to the present General Build. In many cases,
unread,
Guiding assitant
Paul PHD2 reports "up to date" with respect to the present General Build. In many cases,
Nov 26
Mat R
,
Bruce Waddington
2
Nov 25
Information about Transfert Fonction
Handled via private e-mail. Bruce On Tuesday, November 25, 2025 at 2:43:39 AM UTC-8 math.r...@gmail.
unread,
Information about Transfert Fonction
Handled via private e-mail. Bruce On Tuesday, November 25, 2025 at 2:43:39 AM UTC-8 math.r...@gmail.
Nov 25
ERIC MCELROY
, …
Brian Valente
9
Nov 24
Connecting a ZWO ASI2600MM Air
Connection issues resolved and now working as expected. The issue was nothing related to PHD2. But
unread,
Connecting a ZWO ASI2600MM Air
Connection issues resolved and now working as expected. The issue was nothing related to PHD2. But
Nov 24
ardr...@gmail.com
,
Bryan
3
Nov 24
Problems getting HEM44 to Calibrate
Turns out polar alignment might not have been "fine". Was able to calibrate after re-
unread,
Problems getting HEM44 to Calibrate
Turns out polar alignment might not have been "fine". Was able to calibrate after re-
Nov 24
Pawan Singh
,
Bruce Waddington
4
Nov 23
Help with PHD Star Lost recovery
I don't think I'd start by replacing the camera, the problem is much more likely to be coming
unread,
Help with PHD Star Lost recovery
I don't think I'd start by replacing the camera, the problem is much more likely to be coming
Nov 23
Paul Wilson
,
Brian Valente
7
Nov 23
Pulse guide RA
It's possible, diagnostic images for lost star events would show us On Sun, Nov 23, 2025 at 8:21
unread,
Pulse guide RA
It's possible, diagnostic images for lost star events would show us On Sun, Nov 23, 2025 at 8:21
Nov 23
Matt Brown
,
Bruce Waddington
3
Nov 19
PHD2 Crashing
The debug log shows you've gotten fouled up with the guide camera connection - you have PHD2
unread,
PHD2 Crashing
The debug log shows you've gotten fouled up with the guide camera connection - you have PHD2
Nov 19
Matt Brown
,
Bruce Waddington
2
Nov 19
Test Post
Newly added members are moderated at first, then are taken off moderated status after we see they are
unread,
Test Post
Newly added members are moderated at first, then are taken off moderated status after we see they are
Nov 19
G-Man 007
2
Nov 18
PHD2 with Celestron CPWI or Celestron Unified Driver 6.1.7350
Update, so I switched to iPolar Polarscope so does anyone have experience with using CPWI and CUD 6.1
unread,
PHD2 with Celestron CPWI or Celestron Unified Driver 6.1.7350
Update, so I switched to iPolar Polarscope so does anyone have experience with using CPWI and CUD 6.1
Nov 18
Elusive Photons
,
Bruce Waddington
5
Nov 18
Voyager & PHD2 Calibration
You ask "is it bad to calibrate at the Dec of your target?" I would say it ranges from
unread,
Voyager & PHD2 Calibration
You ask "is it bad to calibrate at the Dec of your target?" I would say it ranges from
Nov 18
BigDan
, …
Bruce Waddington
5
Nov 18
COM Problem with PHD2
If you update to our latest dev release, 2.6.13dev8, you can use the new-profile-wizard to create a
unread,
COM Problem with PHD2
If you update to our latest dev release, 2.6.13dev8, you can use the new-profile-wizard to create a
Nov 18
Filippo bonfante
,
Bruce Waddington
4
Nov 18
ASCOM DRIVER FAILED CHECHINK IS PULSEGUIDING
ty for the answer, Bruce. I will try to reinstall ascom and gs server. ty Il giorno lunedì 17
unread,
ASCOM DRIVER FAILED CHECHINK IS PULSEGUIDING
ty for the answer, Bruce. I will try to reinstall ascom and gs server. ty Il giorno lunedì 17
Nov 18
Michael Stadtmauer
, …
Elusive Photons
5
Nov 17
DirectGuide un-selects itself
Just wanted to post that the fix for this 'bug' is to ensure that 'Stop Guiding When
unread,
DirectGuide un-selects itself
Just wanted to post that the fix for this 'bug' is to ensure that 'Stop Guiding When
Nov 17
Jeff Ratino
,
bw_m...@earthlink.net
20
Nov 14
Major issues with my Tracking/Guiding
This shouldn't be hard, there shouldn't be any trial and error needed or anything to remember
unread,
Major issues with my Tracking/Guiding
This shouldn't be hard, there shouldn't be any trial and error needed or anything to remember
Nov 14
Kevin McQuown
,
Bruce Waddington
6
Nov 14
Struggling with what might be wrong with my PHD2 calibration
I see it. I have disconnected the rotator completely.
unread,
Struggling with what might be wrong with my PHD2 calibration
I see it. I have disconnected the rotator completely.
Nov 14
Rod Bell
, …
Bryan
7
Nov 14
PHD2 Calibration
Yeah, I tried that Bryan, but kept getting this error in Bold black below.... I'm using a remote
unread,
PHD2 Calibration
Yeah, I tried that Bryan, but kept getting this error in Bold black below.... I'm using a remote
Nov 14
Rick Wiggins
,
Bruce Waddington
4
Nov 13
Using Phd2 w/ SBIG 16803, SBIB A/O, PWI4, and NINA
I think it's fairly likely that multi-star guiding in PHD2 will produce excellent results.
unread,
Using Phd2 w/ SBIG 16803, SBIB A/O, PWI4, and NINA
I think it's fairly likely that multi-star guiding in PHD2 will produce excellent results.
Nov 13
George Hart
, …
richar...@bigpond.com
5
Nov 12
Backlash compensation: Advanced Settings vs. Guiding Assistant values
Hi Geoge 90ms is not much at all and I'd be very happy with that, mine is a lot more but I can
unread,
Backlash compensation: Advanced Settings vs. Guiding Assistant values
Hi Geoge 90ms is not much at all and I'd be very happy with that, mine is a lot more but I can
Nov 12
Avishek Aiyar
Nov 12
PhD2 windows getting cropped on Microsoft Surface 7 Pro
Hello All , Not exactly a guiding question. I have been using Phd2 for a while on my Windows 10 home
unread,
PhD2 windows getting cropped on Microsoft Surface 7 Pro
Hello All , Not exactly a guiding question. I have been using Phd2 for a while on my Windows 10 home
Nov 12
gary
,
Bruce Waddington
2
Nov 11
Does the attached 'Pattern' of spikes suggest anything?
Inasmuch as the spikes occur in Dec, I would say it's unlikely to be coming from the mount - the
unread,
Does the attached 'Pattern' of spikes suggest anything?
Inasmuch as the spikes occur in Dec, I would say it's unlikely to be coming from the mount - the
Nov 11
Aidan Bonicker
, …
Bryan
6
Nov 7
RA Starts going crazy out of nowhere
Thanks for the advice, but looking back at my logs I think I can give some more context. On the 4th I
unread,
RA Starts going crazy out of nowhere
Thanks for the advice, but looking back at my logs I think I can give some more context. On the 4th I
Nov 7
Vince Tambellini
,
Bruce Waddington
5
Nov 7
CEM70 Guiding Troubles- Large RA peaks causing Elongated and Bad Calibrations
This is going to be a long response. We can start with some operational problems and mis-conceptions
unread,
CEM70 Guiding Troubles- Large RA peaks causing Elongated and Bad Calibrations
This is going to be a long response. We can start with some operational problems and mis-conceptions
Nov 7