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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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Alois Regl
, …
Michael Waring
3
4:33 AM
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
4:33 AM
Richard Scott
,
Brian Valente
4
Nov 26
Guiding on a Geostationary Satellite
If you're doing geostationary and they are 'barely moving' why not just use sidereal.
unread,
Guiding on a Geostationary Satellite
If you're doing geostationary and they are 'barely moving' why not just use sidereal.
Nov 26
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
Kevin Wisdom
,
Bruce Waddington
12
Nov 20
Massive guiding excursions with new mount
I think it's clearly better and the Dec stability is about where you want it. I think the RA data
unread,
Massive guiding excursions with new mount
I think it's clearly better and the Dec stability is about where you want it. I think the RA data
Nov 20
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
Aidan Bonicker
,
Bruce Waddington
5
Nov 7
Problems Guiding with the Star Adventurer GTI
Ok, you're in the queue. On Friday, November 7, 2025 at 9:54:55 AM UTC-8 aidanb...@gmail.com
unread,
Problems Guiding with the Star Adventurer GTI
Ok, you're in the queue. On Friday, November 7, 2025 at 9:54:55 AM UTC-8 aidanb...@gmail.com
Nov 7
Kevin Quin
, …
Mike Ales
11
Nov 7
Communication problem between PHD2 and Nitecrawler rotator?
Kevin, I believe the reason things keep changing on you is that you need to get the reverse direction
unread,
Communication problem between PHD2 and Nitecrawler rotator?
Kevin, I believe the reason things keep changing on you is that you need to get the reverse direction
Nov 7
ROY MIXON
,
Bruce Waddington
6
Nov 5
GUIDE ASSISTANCE, POLAR ALIGNMENT ERROR
Probably. On Wednesday, November 5, 2025 at 8:51:22 AM UTC-8 mypat...@gmail.com wrote: Bruce Does
unread,
GUIDE ASSISTANCE, POLAR ALIGNMENT ERROR
Probably. On Wednesday, November 5, 2025 at 8:51:22 AM UTC-8 mypat...@gmail.com wrote: Bruce Does
Nov 5
Jerel smith
,
Bruce Waddington
2
Nov 4
Getting PHD2 to work with ZWO ASI camera and iOptron HEM 27 EC mount
Since you're running on a Mac, your best option is probably to use an INDI mount connection to
unread,
Getting PHD2 to work with ZWO ASI camera and iOptron HEM 27 EC mount
Since you're running on a Mac, your best option is probably to use an INDI mount connection to
Nov 4
Maxastro59
,
Bruce Waddington
4
Nov 4
Bad guiding after many years
Thanks Bruce, your suspicion actually seems the most reasonable, although this setup has been in
unread,
Bad guiding after many years
Thanks Bruce, your suspicion actually seems the most reasonable, although this setup has been in
Nov 4