Dither - how is it triggered

[Guest]

I know what dither is but I'm not sure how it gets done. I use EQASCOM, APT and PHD2.

Have I got this right? Dithering is set up and initiated by APT which sends dither commands to EQASCOM. But PHD2 needs to know about the dither pulses and it gets that from EQASCOM

Cheers

Steve

 

[vlaiv]

As far as I remember - imaging app triggers dither once exposure is finished and it does so by issuing command to guiding application.

Guiding app is responsible for dither move - which is basically just long guide pulse in random direction. PHD2 is doing it usually once it is instructed by imaging app.

[tomato]

I can’t comment directly on APT but certainly for SGP and NINA if PHD2 and your mount are connected to the imaging control software and you request it to dither in between subs, then it happens. 
There are dithering parameters that can be adjusted in PHD2, but I’m not sure if these are overwritten by the imaging software, assuming they are also in that software.

[bottletopburly]

Just make sure phd2 is set to server mode , Apt will take care of everything else , just choose phd2 in dither settings  ,adjust your dithers settings to suit in APT.

[michael8554]

6 hours ago, bottletopburly said:

Just make sure phd2 is set to server mode

PHD2 / Tools / Enable Server

Michael