ASI183mcPro not writing frames consistantly

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ASI183mcPro not writing frames consistantly

Post by SELPhotographer » Thu May 14, 2020 3:58 pm

I have an ASI183mcPro cam. And though I'm new to astrocams, I'm not new to this. The camera takes nice images - but it's not writing frames out consistently according to the shutter duration. Last night, I was shooting 120s subs - and the camera would take pauses during the series. The pauses did not register as dropped frames - rather they threw no error at all.

I've seen this before on frame longer than 60s. The issue is quite frustrating. What should have been a 100 min session last night was more like 180 min... wasting precious imaging time.

I am on a Macbook Pro - 2018, Catalina 10.15.4. ASICAP 1.6.2. The camera setting was as follows:

* USB Traffic 50
* Gain: 111
* Temp -10C
* Shutter duration 120s

The camera is hooked to a 12V power supply that has a 5A rating (so that should be providing enough power) -
It's cooling just fine - and aside from some amp glow, the image are very good.
Screen Shot 2020-05-14 at 11.56.18 AM.png
This is wasting precious imaging time. This was to be a 50 frame shoot (about 100 min) - and turned out to take closer to 3 hrs. 180 min vs 100 min when all was said and done.

I really need help here. The computer had every energy saver and screen saver turned OFF as well (as I've had this happen before.

Posts: 205
Joined: Wed Apr 01, 2020 8:28 am

Re: ASI183mcPro not writing frames consistantly

Post by Moson » Fri May 15, 2020 3:57 am

You could send an e-mail to with the log of ASICAP.

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