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1–30 of 7148
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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W Sc
, …
Brian Valente
12
12:00 AM
Advice requested on dealing with backlash
>>> I re ran calibration and Im not sure how to upload to this thread. log upload is the
unread,
Advice requested on dealing with backlash
>>> I re ran calibration and Im not sure how to upload to this thread. log upload is the
12:00 AM
Reinhold Friedrich Auer
, …
Andy Galasso
19
Aug 30
Camera C1-500A Morvian Instruments cannot be connected
Reinhold, In case you didn't see it I sent you a direct email a couple days ago with a link to
unread,
Camera C1-500A Morvian Instruments cannot be connected
Reinhold, In case you didn't see it I sent you a direct email a couple days ago with a link to
Aug 30
LJ Y
,
Bruce Waddington
3
Aug 22
Possible 8-bit signed-char bug in native ToupTek driver
Update: we happen to have one of these cameras and can see the problem in 2.6.14. It will be fixed in
unread,
Possible 8-bit signed-char bug in native ToupTek driver
Update: we happen to have one of these cameras and can see the problem in 2.6.14. It will be fixed in
Aug 22
Allan Saul
, …
Bruce Waddington
6
Aug 22
Problems with SV305M Pro
Thanks for letting us know - happy imaging... Bruce On Saturday, August 22, 2026 at 7:13:55 PM UTC-7
unread,
Problems with SV305M Pro
Thanks for letting us know - happy imaging... Bruce On Saturday, August 22, 2026 at 7:13:55 PM UTC-7
Aug 22
Alan Moore
,
Bruce Waddington
3
Aug 19
Intermittent guiding success
Thank you. I'm using the ASI 2600 MM Duo, which has a guide camera incorporated into the main
unread,
Intermittent guiding success
Thank you. I'm using the ASI 2600 MM Duo, which has a guide camera incorporated into the main
Aug 19
pauls...@gmail.com
, …
Brian Valente
6
Aug 19
strange declination guiding
Please see attached an image from the synscan app's Backlash option settings. many thanks, Paul
unread,
strange declination guiding
Please see attached an image from the synscan app's Backlash option settings. many thanks, Paul
Aug 19
Steven Bellavia
, …
bw_m...@earthlink.net
7
Aug 17
Guiding stopped: the scope started slewing
Thanks. Yeah, I have to watch where that cursor is. On another night, in the middle of an image, I
unread,
Guiding stopped: the scope started slewing
Thanks. Yeah, I have to watch where that cursor is. On another night, in the middle of an image, I
Aug 17
Ross Salinger
, …
Bruce Waddington
8
Aug 17
Alpaca and PHD
I don't think we need to go down this road. We currently have an internal build with an
unread,
Alpaca and PHD
I don't think we need to go down this road. We currently have an internal build with an
Aug 17
Armando Vaccaro
, …
Bruce Waddington
4
Aug 16
Issue with PHD2 Pulse Guiding over USB on Fornax 52 / Ursa Minor MC5
You need to communicate with the person who "owns" the ASCOM driver - either the author or
unread,
Issue with PHD2 Pulse Guiding over USB on Fornax 52 / Ursa Minor MC5
You need to communicate with the person who "owns" the ASCOM driver - either the author or
Aug 16
Jos Bodden
, …
Bruce Waddington
4
Aug 16
PHD2 and AM5N mount
Thank you very much Tim this is certainly a useful answer. I take this that for an AM5N you have to
unread,
PHD2 and AM5N mount
Thank you very much Tim this is certainly a useful answer. I take this that for an AM5N you have to
Aug 16
Andy Nowlen
,
Bruce Waddington
2
Aug 15
Calibrating Errors
Hi Andy. If we go back to the first night when the problem first appeared, what I see is that things
unread,
Calibrating Errors
Hi Andy. If we go back to the first night when the problem first appeared, what I see is that things
Aug 15
Sanjeev Joshi
, …
Franklin Shaffer
19
Aug 15
Interesting problem Dec axis with iOptron CEM 70 EC2
Wanted to provide a quick update. The Dec backlash was mechanically reduced from 4700 ms to 2200 ms.
unread,
Interesting problem Dec axis with iOptron CEM 70 EC2
Wanted to provide a quick update. The Dec backlash was mechanically reduced from 4700 ms to 2200 ms.
Aug 15
Bruce Waddington
Aug 12
Re: Dark Library Data Lost When Switching Between Camera Profiles
I'm not able to sort through all this. When you have made your best effort on this without
unread,
Re: Dark Library Data Lost When Switching Between Camera Profiles
I'm not able to sort through all this. When you have made your best effort on this without
Aug 12
S Am
,
Brian Valente
3
Aug 9
DEC guiding issue
Thank you very much Brian for your quick response. I'll keep investigating the cabling. Just to
unread,
DEC guiding issue
Thank you very much Brian for your quick response. I'll keep investigating the cabling. Just to
Aug 9
Reinhold Friedrich Auer
,
Bruce Waddington
3
Aug 7
Guiding camera S1-5000A from Moravian Intruments
bw_m...@earthlink.net schrieb am Sonntag, 2. August 2026 um 19:59:59 UTC+2: As far as we can tell,
unread,
Guiding camera S1-5000A from Moravian Intruments
bw_m...@earthlink.net schrieb am Sonntag, 2. August 2026 um 19:59:59 UTC+2: As far as we can tell,
Aug 7
David Ridge
,
Bruce Waddington
3
Aug 6
Meridian Flip caused guiding to stop?
thanks. Cables! :( :) David On Thursday, August 6, 2026 at 2:58:58 PM UTC-6 bw_m...@earthlink.net
unread,
Meridian Flip caused guiding to stop?
thanks. Cables! :( :) David On Thursday, August 6, 2026 at 2:58:58 PM UTC-6 bw_m...@earthlink.net
Aug 6
Georg Albrecht
, …
Brian Valente
6
Aug 6
Guiding Assistant for capturing seeing conditions
Hi Don I have similar conditions (SoCal desert) with hot starts. One of the last nights started out
unread,
Guiding Assistant for capturing seeing conditions
Hi Don I have similar conditions (SoCal desert) with hot starts. One of the last nights started out
Aug 6
Don Waters
, …
Brian Valente
6
Aug 4
PPEC
I understand that AI has its limitations and often gives wrong answers, but I find if I dig, I do
unread,
PPEC
I understand that AI has its limitations and often gives wrong answers, but I find if I dig, I do
Aug 4
Jack Bernstein
, …
Bruce Waddington
4
Aug 4
Poor guiding with AM5 and OAG
Thanks Bruce and Nelson! Jack M. Bernstein Sent from my iPhone On Aug 4, 2026, at 13:55, Bruce
unread,
Poor guiding with AM5 and OAG
Thanks Bruce and Nelson! Jack M. Bernstein Sent from my iPhone On Aug 4, 2026, at 13:55, Bruce
Aug 4
Andyb90
,
Brian Valente
9
Aug 3
Guide Camera Gain Setting is Greyed Out/Disabled in PHD2
I guess my setup is a bit more unusual in that the guide sensor will be behind a 5nm dual narrowband
unread,
Guide Camera Gain Setting is Greyed Out/Disabled in PHD2
I guess my setup is a bit more unusual in that the guide sensor will be behind a 5nm dual narrowband
Aug 3
Peter Leveillee
,
Brian Valente
3
Aug 2
Using PHD2 and SharpCap with ZWO ASI 120 camera
Hi Brian, I am relatively new to PHD2. Next time I can try without PHD2 on at all. I am not sure why
unread,
Using PHD2 and SharpCap with ZWO ASI 120 camera
Hi Brian, I am relatively new to PHD2. Next time I can try without PHD2 on at all. I am not sure why
Aug 2
Martin Dowd
,
Bruce Waddington
2
Aug 2
A Big Thanks to the PHD2 Team
Thanks for the kind words, Martin. Replacing a PC at a remote location is always a pain, been there,
unread,
A Big Thanks to the PHD2 Team
Thanks for the kind words, Martin. Replacing a PC at a remote location is always a pain, been there,
Aug 2
NY2KW
,
Bruce Waddington
3
Aug 1
Room for improvement?
HI Bruce, Yes, It's on a permanent pier at StarFront in Texas. I've had more clear nights
unread,
Room for improvement?
HI Bruce, Yes, It's on a permanent pier at StarFront in Texas. I've had more clear nights
Aug 1
James Wentworth
, …
Brian Valente
3
Aug 1
RA randomly over corrrects. see in guide log
HI James Any more detail here? I don't see overcorrections. What I see is a couple places where
unread,
RA randomly over corrrects. see in guide log
HI James Any more detail here? I don't see overcorrections. What I see is a couple places where
Aug 1
Robert Lowenthal
Aug 1
Star Lost - Low HFD events
While guiding using an OAG with an ASI174MM Mini on a short-focal-length refractor (400 mm), I've
unread,
Star Lost - Low HFD events
While guiding using an OAG with an ASI174MM Mini on a short-focal-length refractor (400 mm), I've
Aug 1
Don Waters
,
Brian Valente
4
Jul 31
Logfile
https://openphdguiding.org/logs/dl/PHD2_logs_3HJw.zip New guiding logs with PPEC enabled. Overall RMS
unread,
Logfile
https://openphdguiding.org/logs/dl/PHD2_logs_3HJw.zip New guiding logs with PPEC enabled. Overall RMS
Jul 31
myk...@gmail.com
,
bw_m...@earthlink.net
9
Jul 28
Subject: Reproducible crash (0xc0000005) in PHD2 during camera looping with custom Alpaca camera server
This is great, congratulations! Nice job of sticking with this and grinding through the details! Have
unread,
Subject: Reproducible crash (0xc0000005) in PHD2 during camera looping with custom Alpaca camera server
This is great, congratulations! Nice job of sticking with this and grinding through the details! Have
Jul 28
Reinhold Friedrich Auer
Jul 28
PHD2 guiding with C1-5000A camera from Moravian Instruments
Dear Colleagues, Has anybody tried to use the above mentioned camera from Moravian instrumentsfor
unread,
PHD2 guiding with C1-5000A camera from Moravian Instruments
Dear Colleagues, Has anybody tried to use the above mentioned camera from Moravian instrumentsfor
Jul 28
Jeff Nibler
Jul 27
Guide pulse direction appears to be reversed, only at declination of 33
PHD2 has been working fine, but at specifically declination 33, it appears PHD may be pulsing in the
unread,
Guide pulse direction appears to be reversed, only at declination of 33
PHD2 has been working fine, but at specifically declination 33, it appears PHD may be pulsing in the
Jul 27
Gary
,
Bruce Waddington
4
Jul 27
Diagnostic image logging
I'm afraid your understanding is mistaken. When you're having problems like this, it's
unread,
Diagnostic image logging
I'm afraid your understanding is mistaken. When you're having problems like this, it's
Jul 27