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1–30 of 7141
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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Jos Bodden
,
Tim Stevenson
2
12:57 PM
PHD2 and AM5N mount
Jos... There is a box to " Reverse Dec output after meridian flip" in the Advanced Settings
unread,
PHD2 and AM5N mount
Jos... There is a box to " Reverse Dec output after meridian flip" in the Advanced Settings
12:57 PM
Sanjeev Joshi
, …
Franklin Shaffer
19
1:11 AM
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.
1:11 AM
Andy Nowlen
Aug 14
Calibrating Errors
https://openphdguiding.org/logs/dl/PHD2_logs_LL6f.zip My normal guiding runs between .66 and .9 Last
unread,
Calibrating Errors
https://openphdguiding.org/logs/dl/PHD2_logs_LL6f.zip My normal guiding runs between .66 and .9 Last
Aug 14
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
Allan Saul
, …
Bruce Waddington
4
Aug 10
Problems with SV305M Pro
Did you read the entire thread? The OP resolved his own problem by simply correcting a driver
unread,
Problems with SV305M Pro
Did you read the entire thread? The OP resolved his own problem by simply correcting a driver
Aug 10
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
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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
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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
Aidan Bonicker
3
Jul 26
Problem with subframe guiding
Hello, You can disregard this request. I was able to eliminate the need for subframes in the first
unread,
Problem with subframe guiding
Hello, You can disregard this request. I was able to eliminate the need for subframes in the first
Jul 26
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