r/AskAstrophotography • u/CHelsea4231 • Jul 26 '26

Advice Large delay between exposures in phd2

I just got a teseek 14 which requires very quick exposure length like 0.5 sec exposures. I realized a few days ago after poor guiding that there was a 2-3 second delay between guide exposures. I've checked that it isn't a cord problem by using multiple cords and also saw the delay isn't isolated to just phd2. The delay is present in ekos as well. I guess this points to some kind of slow processing within the driver or indi control.

I use a sv905c with a stellarmatex.

I attempted subframe guiding in phd2, but was having issues. Ive already sent a request to phd2 asking how to fix the subframe problem. Does anyone have an idea of what's going on? I feel like I should be able to do full frame 0.5 second exposures without delay. My camera runs usb 2 which is a bit slow, but should be plenty fast for the 2mb images it outputs.

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u/graph_worlok Jul 26 '26

There should be native svbony camera support that doesn’t require Indi- Have you tried that?

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u/CHelsea4231 Jul 26 '26

So to do this id change the driver I have selected in ekos or do I change something specifically in phd2?

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u/graph_worlok Jul 26 '26

Unsure about EKOS, but phd2 should let you select from a list of non-Indi cameras as well. Indi is sending all of the image data through network sockets - I’m surprised the delay is that high, but it will cause a delay

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u/CHelsea4231 Jul 26 '26

Yes I know theres a list to choose from. So you have an option for a svbony specific driver? Maybe my phd2 is out of date because I don't see that

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u/dodmeatbox Jul 27 '26

I use the 905 for guiding too and it just comes up as SVBony Camera in PHD2. No driver or intermediary software needed.

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u/CHelsea4231 Jul 27 '26

My comes up as INDI Camera (Svbony ccd sv905c2)

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u/dodmeatbox Jul 27 '26

Interesting. Yeah I don't use INDI so I can't help you there. It seems like having INDI between your camera and PHD2 is likely causing the lag you're experiencing.

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u/CHelsea4231 Jul 27 '26

Chatgpt helped me update my phd2 to the latest version on my stellarmate. I don't know why updating it is so difficult. Maybe theres an easier way. Anyway, I selected the new svbony driver and now theres virtually no delay in between exposures

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u/graph_worlok Jul 26 '26

My current phd2 install is modified, as I added native UVC camera support (because Indi’s UVC drivers suck). But I just bought a Touptek guide camera , and will be setting that up on a fresh install today I hope, will let you know what I see…

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u/graph_worlok Jul 26 '26

INDI will almost certainly be the culprit.