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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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Jack Bernstein, Rick Cohen2

12:15 PM

Guiding goes crazy after meridian flip

Try searching this forum for "Reverse DEC output after meridian flip". There's a

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Guiding goes crazy after meridian flip

Try searching this forum for "Reverse DEC output after meridian flip". There's a

12:15 PM

G-Man 007, Dale Ghent2

1:43 AM

Celestron Unified Driver 6.1.7350, PHD2, and NexStar 8SE with Wedge

On 10/14/2025 9:39 PM, G-Man 007 wrote: > I have a NexStar 8SE Alt/Az Mount but I also plan to use

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Celestron Unified Driver 6.1.7350, PHD2, and NexStar 8SE with Wedge

On 10/14/2025 9:39 PM, G-Man 007 wrote: > I have a NexStar 8SE Alt/Az Mount but I also plan to use

1:43 AM

Don Waters, … Bruce Waddington3

Oct 14

Declination drift reverses direction depending on the details of how you are mis-aligned on the

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Declination drift reverses direction depending on the details of how you are mis-aligned on the

Oct 14

Don Waters, Bruce Waddington2

Oct 14

logs from last night

The PHD2 estimates of polar alignment error come from measures of drift in declination. We have no

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logs from last night

The PHD2 estimates of polar alignment error come from measures of drift in declination. We have no

Oct 14

Marco Malziotti, Bruce Waddington6

Oct 12

Celestron advanced VX - Suggested parameters to improve backlash

"GA" is shorthand for "Guiding Assistant", "CA" is shorthand for "

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Celestron advanced VX - Suggested parameters to improve backlash

"GA" is shorthand for "Guiding Assistant", "CA" is shorthand for "

Oct 12

Rita Castilho, Bruce Waddington9

Oct 12

apparent mount disconnect

That's probably a good option. Just be sure you create a new PHD2 profile for the EQMOD

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apparent mount disconnect

That's probably a good option. Just be sure you create a new PHD2 profile for the EQMOD

Oct 12

Luca Bartolucci, … steve7

Oct 12

Trouble getting stable guiding graphs in PHD2

Hi I don't think a change of software will help, but a dismantle, clean and regrease will.

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Trouble getting stable guiding graphs in PHD2

Hi I don't think a change of software will help, but a dismantle, clean and regrease will.

Oct 12

Jeff Kelly, Bruce Waddington2

Oct 11

PHD2 was trying to tell you what was wrong with this alert: 20:47:55.497 00.000 28328 Alert: PHD2 is

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PHD2 was trying to tell you what was wrong with this alert: 20:47:55.497 00.000 28328 Alert: PHD2 is

Oct 11

lukfer sentencia, … Brian Valente5

Oct 11

ASI2600MC PRO and ASI120 Mini conflict when used simultaneously with NINA and PHD2

It seems that both programs are connecting to the main camera. For some reason, PHD2 doesn't

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ASI2600MC PRO and ASI120 Mini conflict when used simultaneously with NINA and PHD2

It seems that both programs are connecting to the main camera. For some reason, PHD2 doesn't

Oct 11

Ben Marshall, Brian Valente10

Oct 10

Issue with The Sky Pro 64 bit

So this is the ascom settings. The error is the yellow banner at the top telling me ascom does not

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Issue with The Sky Pro 64 bit

So this is the ascom settings. The error is the yellow banner at the top telling me ascom does not

Oct 10

Manuel Shaw, … Brian Valente8

Oct 9

The mount's weight capacity is independent of the issue you are having. Over capacity may affect

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The mount's weight capacity is independent of the issue you are having. Over capacity may affect

Oct 9

Kenn Hopkins, Brian Valente5

Oct 7

Guiding stopped: The scope starting slewing

Kenn >>>PEC MATCH OVERRUN as mentioned on the PEMPro forum, that error has nothing to do

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Guiding stopped: The scope starting slewing

Kenn >>>PEC MATCH OVERRUN as mentioned on the PEMPro forum, that error has nothing to do

Oct 7

Oct 7

guiding stopped

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guiding stopped

Oct 7

Oct 7

guiding stopped

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guiding stopped

Oct 7

Manuel Shaw, Bruce Waddington2

Oct 6

Guiding failure

Please follow the instructions and upload both your guide and debug log files to our server: https://

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Guiding failure

Please follow the instructions and upload both your guide and debug log files to our server: https://

Oct 6

gary, … Brian Valente5

Oct 5

Guiding with a Paramount - pulse guiding or direct guiding with NINA?

Thanks Brian! Gary On Oct 5, 2025, at 1:39 PM, Brian Valente <bval...@gmail.com> wrote: Gary

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Guiding with a Paramount - pulse guiding or direct guiding with NINA?

Thanks Brian! Gary On Oct 5, 2025, at 1:39 PM, Brian Valente <bval...@gmail.com> wrote: Gary

Oct 5

Oct 4

Guiding in NINA Sequence with a Paramount - pulse guiding, direct guiding or both?

Trying to sort out a conflict between online papers. One says select 'Direct Guiding' the

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Guiding in NINA Sequence with a Paramount - pulse guiding, direct guiding or both?

Trying to sort out a conflict between online papers. One says select 'Direct Guiding' the

Oct 4

Ed M, Brian Valente2

Oct 4

Does PHD2 now make dynamic adjustments?

>>> Is PHD2 now making dynamic changes to its settings in response to changing conditions?

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Does PHD2 now make dynamic adjustments?

>>> Is PHD2 now making dynamic changes to its settings in response to changing conditions?

Oct 4

Ettore Guido “Astrofilo66” Basiglio Ribaudo

Oct 4

I finally had my cge pro serviced and this is the result, a smooth ride.

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I finally had my cge pro serviced and this is the result, a smooth ride.

Oct 4

jdh_astro, … Bruce Waddington16

Oct 3

Star Streak Troubleshooting

Thanks for letting us know, Jonathan. You've also demonstrated for yourself how differential

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Star Streak Troubleshooting

Thanks for letting us know, Jonathan. You've also demonstrated for yourself how differential

Oct 3

Malcolm Park, Brian Valente11

Oct 1

good to know, thanks for the ideas! Malcolm On Wednesday, 1 October 2025 at 11:40:22 UTC-4 bval...@

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good to know, thanks for the ideas! Malcolm On Wednesday, 1 October 2025 at 11:40:22 UTC-4 bval...@

Oct 1

Morten B Kristensen, Brian Valente2

Oct 1

Best practice for old mount and sw?

Hi Morten Please upload the logs for your guiding, it will tell us more about how you have the mount

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Best practice for old mount and sw?

Hi Morten Please upload the logs for your guiding, it will tell us more about how you have the mount

Oct 1

Morten B Kristensen, … Brian Valente5

Oct 1

QHY 5L-IIC for guiding in PHD2?

Good to hear, thanks for the update On Wed, Oct 1, 2025 at 5:12 AM Morten B Kristensen <

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QHY 5L-IIC for guiding in PHD2?

Good to hear, thanks for the update On Wed, Oct 1, 2025 at 5:12 AM Morten B Kristensen <

Oct 1

Michael Heald, Brian Valente3

Oct 1

Guide Pixel Scale and PHD2?

Thanks. I've decided to go ahead and update the guide camera. Best regards. Mike On Tuesday,

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Guide Pixel Scale and PHD2?

Thanks. I've decided to go ahead and update the guide camera. Best regards. Mike On Tuesday,

Oct 1

Miguel G, Brian Valente7

Sep 30

Drift-correct graph interpretation

thanks Brian for the explanation. I would give a shot to ppec as suggested. Regards El sáb, 27 sept

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Drift-correct graph interpretation

thanks Brian for the explanation. I would give a shot to ppec as suggested. Regards El sáb, 27 sept

Sep 30

John Schultz, … Bruce Waddington5

Sep 29

PHD2 guiding repeatedly stops working with NINA

Yes, please just set it and leave it alone. Bruce On Monday, September 29, 2025 at 7:51:17 PM UTC-7

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PHD2 guiding repeatedly stops working with NINA

Yes, please just set it and leave it alone. Bruce On Monday, September 29, 2025 at 7:51:17 PM UTC-7

Sep 29

Nick Ambrose, … Bruce Waddington10

Sep 29

PDH2 crashing for no reason

I can give you a version of the executable with debug symbols but it will take me a couple of days

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PDH2 crashing for no reason

I can give you a version of the executable with debug symbols but it will take me a couple of days

Sep 29

gizm...@yahoo.com, … Bruce Waddington6

Sep 28

PHD2 doesn't stop guiding when finishing Light Frames in SGP

Let me expand on my initial response and perhaps save you some time. When doing automated imaging,

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PHD2 doesn't stop guiding when finishing Light Frames in SGP

Let me expand on my initial response and perhaps save you some time. When doing automated imaging,

Sep 28

Chris Gittins, … Bruce Waddington13

Sep 28

For completeness, I've attached screen captures of calibration data and guiding results after

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For completeness, I've attached screen captures of calibration data and guiding results after

Sep 28

KJRitch, … Brian Valente9

Sep 27

Guide Corrections for RA and DEC Delayed

According to Astronomy.tools Guidescope Suitability calculator when I chose my C8 with Hyperstar and

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Guide Corrections for RA and DEC Delayed

According to Astronomy.tools Guidescope Suitability calculator when I chose my C8 with Hyperstar and

Sep 27

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