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PHD vs. PHD2

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#1 Jethro777

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Posted 12 July 2019 - 05:50 PM

It appears that they are similar but different products one made by stark labs and the other open source.
Which is better do you think for a beginner?

I am wanting to know also if, the first time you need to set it up, you need to calibrate it?
How do you do so with these two products?

#2 Jim Waters

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Posted 12 July 2019 - 06:02 PM

Simple; PHD 2 Open source.  Some time ago Stark Labs turned over PHD to the Open Source community.  PHD evolved into PHD 2 and is substantially better.  Use this release.

 

https://openphdguidi...ment-snapshots/

 

Search youtube.com for setup and usage video's - PHD2 or Open PHD 2


Edited by Jim Waters, 12 July 2019 - 06:04 PM.


#3 Stelios

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Posted 12 July 2019 - 06:05 PM

Use PhD2. PhD is totally outdated (and PhD2 is based on PhD anyway). Not close. Forget PhD.

 

The calibration answer depends on how your *mount* is connected:

 

1) ST4 connection: Mount is connected via ST-4 cable to the Autoguide port on the mount (and you set it up as "On Camera" in PhD2). You must calibrate on *every target*.

 

2) Pulse guiding: Mount is connected (to laptop, usually) via a USB2 or Serial-to-USB2 connection. In this case you only need to calibrate at first and when the guide camera angle changes with respect to the mount axes.

 

To understand better: Calibration tells PhD2 which way commands to move the mount in RA and DEC, actually move a particular star (guide star). This way the orientation of the camera is irrelevant--PhD2 figures out what commands it needs to send to restore the guide star to the center of the crosshairs.



#4 Stelios

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Posted 12 July 2019 - 06:09 PM

Use PhD2. PhD is totally outdated (and PhD2 is based on PhD anyway). Not close. Forget PhD.

 

The calibration answer depends on how your *mount* is connected:

 

1) ST4 connection: Mount is connected via ST-4 cable to the Autoguide port on the mount (and you set it up as "On Camera" in PhD2). You must calibrate on *every target* (unless they're very close to each other).

 

2) Pulse guiding: Mount is connected (to laptop, usually) via a USB2 or Serial-to-USB2 connection. In this case you only need to calibrate at first and when the guide camera angle changes with respect to the mount axes.

 

To understand better: Calibration tells PhD2 which way commands to move the mount in RA and DEC, actually move a particular star (guide star). This way the orientation of the camera is irrelevant--PhD2 figures out what commands it needs to send to restore the guide star to the center of the crosshairs.

Forgot to add--if using Pulse Guiding, you should calibrate on a star near Meridian and Equator. The reason is that this maximizes motions on the RA axis, so PhD2 can more accurately figure out how to guide. With an object near the Pole, for example, the movements in RA are so small it's harder for the software to reach accurate conclusions.

Of course if you're using the (inferior) ST4 guiding, you must calibrate on a star near your target. 



#5 Jim Waters

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Posted 12 July 2019 - 06:16 PM

Lets start out slow and not make things too complicated at first.  ST-4 based guiding is OK to start out with.


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#6 mhettrick

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Posted 12 July 2019 - 06:46 PM

In Vietnam, PHD stands for "Pizza Hut Delivers".




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