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1–30 of 7097
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
.
Mark all as read
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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
Gianluca Rossi
, …
Brian Valente
4
Jun 21
RA poor tracking
Thank you all for the replies. It is a very old mount so I think I will have to open up the RA gear
unread,
RA poor tracking
Thank you all for the replies. It is a very old mount so I think I will have to open up the RA gear
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
NY2KW
, …
bw_m...@earthlink.net
7
Jun 19
Patchy Clouds - Terrible Guiding - Could we have a poor rms alert?
I think you need to slow down a bit here and work through things systematically. I don't see
unread,
Patchy Clouds - Terrible Guiding - Could we have a poor rms alert?
I think you need to slow down a bit here and work through things systematically. I don't see
Jun 19
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
Richard Brown
, …
Brian Valente
7
Jun 2
Guiding Using The Guiding Module Camera On Star'Ex Spectroscope
>>>I think it was a faulty cable that definitely happens, hopefully you've found the
unread,
Guiding Using The Guiding Module Camera On Star'Ex Spectroscope
>>>I think it was a faulty cable that definitely happens, hopefully you've found the
Jun 2
PartlyC
, …
Bruce Waddington
6
May 30
Adjust Lock Position - Is this what I think it might be?
Trying experimenting with it this way: 1. Make sure you are guiding normally with the guider exposure
unread,
Adjust Lock Position - Is this what I think it might be?
Trying experimenting with it this way: 1. Make sure you are guiding normally with the guider exposure
May 30
NY2KW
, …
Brian Valente
6
May 29
Wave 150i RA Hysteresis v. PPEC
Do you have a picture from the opposite side? the guiding setup and the CAA is blocked by the ASIAir
unread,
Wave 150i RA Hysteresis v. PPEC
Do you have a picture from the opposite side? the guiding setup and the CAA is blocked by the ASIAir
May 29
NY2KW
,
Bruce Waddington
2
May 29
Are Posts Moderated?
Your initial post after joining is moderated, I explained that in the 'welcome' message I
unread,
Are Posts Moderated?
Your initial post after joining is moderated, I explained that in the 'welcome' message I
May 29
Rob Smith
, …
Bruce Waddington
4
May 27
ZWO / PHD Calibration issue
The log files you uploaded were from a session on 5/24 and they show a reasonable calibration using
unread,
ZWO / PHD Calibration issue
The log files you uploaded were from a session on 5/24 and they show a reasonable calibration using
May 27
robert.s...@gmail.com
, …
Richard Scott
4
May 23
Improvement to Auto-star-selection process
Hi Bruce, This is great information to know and something I haven't seen in the manual. I too
unread,
Improvement to Auto-star-selection process
Hi Bruce, This is great information to know and something I haven't seen in the manual. I too
May 23
sai...@suddenlink.net
, …
Douglas K Duncan
9
May 19
New CEM70 mount and poor guiding
Where do you get seeing that good? I'm envious. Sent from my iPhone On May 18, 2026, at 6:23 PM,
unread,
New CEM70 mount and poor guiding
Where do you get seeing that good? I'm envious. Sent from my iPhone On May 18, 2026, at 6:23 PM,
May 19
Tim Moody
,
Bruce Waddington
6
May 19
save guider images
In addition to the various diagnostic imaging options, you can always do a File/Save to capture
unread,
save guider images
In addition to the various diagnostic imaging options, you can always do a File/Save to capture
May 19
Graham Smith
,
Brian Valente
4
May 17
Guiding accuracy differences between targets
>>>I ran guide assistant after the calibration and I think that is the 1st 3 minutes. Would
unread,
Guiding accuracy differences between targets
>>>I ran guide assistant after the calibration and I think that is the 1st 3 minutes. Would
May 17
sarg314
, …
Brian Valente
5
May 17
integration times
>>>Do harmonic mounts have a preferred preload direction - in the easterly or westerly
unread,
integration times
>>>Do harmonic mounts have a preferred preload direction - in the easterly or westerly
May 17
umasscrew39
, …
Brian Valente
7
May 17
Guiding only working on one side of the meridian
FYI.... I applied the PPEC settings to 'mimic' a PE curve as you suggested. It made a very
unread,
Guiding only working on one side of the meridian
FYI.... I applied the PPEC settings to 'mimic' a PE curve as you suggested. It made a very
May 17
John Rightten
, …
Bruce Waddington
21
May 16
Help Interpret PHD2 log, is my polar alignment good enough?
If you get a decent calibration, just keep using it, you're not going to get anywhere trying to
unread,
Help Interpret PHD2 log, is my polar alignment good enough?
If you get a decent calibration, just keep using it, you're not going to get anywhere trying to
May 16
Phil Bordelon
,
Brian Valente
4
May 16
Elongated stars after new profile/calibration/baseline
Sounds good Phil Brian On Fri, May 15, 2026 at 8:54 PM Phil Bordelon <pbor...@gmail.com>
unread,
Elongated stars after new profile/calibration/baseline
Sounds good Phil Brian On Fri, May 15, 2026 at 8:54 PM Phil Bordelon <pbor...@gmail.com>
May 16
Behyar Bakhshandeh
, …
Brian Valente
4
May 14
Guiding Runs Away After NINA Meridian Flip
Hi Behyar This may take some more analysis. You have a number of errors with your equipment including
unread,
Guiding Runs Away After NINA Meridian Flip
Hi Behyar This may take some more analysis. You have a number of errors with your equipment including
May 14
pauls...@gmail.com
,
Brian Valente
3
May 13
message indicating DEC guiding problem
thanks for reply Brian, much appreciated. re your numbered points: 1 - I use NINA and neglected to
unread,
message indicating DEC guiding problem
thanks for reply Brian, much appreciated. re your numbered points: 1 - I use NINA and neglected to
May 13
mario.mor...@gmail.com
,
Ralph Waid
4
May 4
QHY5-II driver for Windows XP
Thank you very much !! I will now look at the indicated sites. El lunes, 4 de mayo de 2026 a las 15:
unread,
QHY5-II driver for Windows XP
Thank you very much !! I will now look at the indicated sites. El lunes, 4 de mayo de 2026 a las 15:
May 4