ASI 120 Exposure Failed on every first exposure

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MikeP
Posts: 23
Joined: Sat Sep 23, 2017 4:44 am

ASI 120 Exposure Failed on every first exposure

Post by MikeP » Sun Jan 27, 2019 5:53 am

Hi Chad,

I've got a user with a strange issue with an ASI 120MC. When he takes images with my application the first exposure always fails. The returned error is ExposureFail. Strangely subsequent exposures work fine with no errors.

Can you think of any goo reason why the first exposure fails?

Thanks,

Mike

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chad
Posts: 571
Joined: Thu Feb 09, 2017 4:58 am

Re: ASI 120 Exposure Failed on every first exposure

Post by chad » Mon Jan 28, 2019 2:08 am

Hi Mike,
I have to say, it is normal. 120 is our first generation of product, So it has many problems.
For your problem, I think it should be caused by Snap. We know the snap mode for 120 has problem, but it is limited by the hardware, we could not solve it now.
So I think you should use video mode to avoid this problem, only for 120MM and 120MC.
You can use this sentence to check:
if (CamInfo.bIsUSB3Cam || (CamInfo.Name.ToLower().IndexOf("mini") > -1))
ASICameraDll2.ASIStartExposure(CamInfo.CameraID);
else
ASICameraDll2.ASIStartVideoCapture(CamInfo.CameraID);
Thanks
Chad
ZWO Driver Engineer
Location:lon=120.6 lat=31.3
SuZhou China

MikeP
Posts: 23
Joined: Sat Sep 23, 2017 4:44 am

Re: ASI 120 Exposure Failed on every first exposure

Post by MikeP » Mon Jan 28, 2019 11:41 am

Thanks Chad, I will bear this in mind.

One question about this though:

if (CamInfo.bIsUSB3Cam || (CamInfo.Name.ToLower().IndexOf("mini") > -1))

I think one problem with this is that if a user connects a newer USB3 camera with a USB2 cable then the 'IsUSB3Cam' value will be false. Or are you saying that all cameras have a problem if USB2 is used?

Thanks,

Mike

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chad
Posts: 571
Joined: Thu Feb 09, 2017 4:58 am

Re: ASI 120 Exposure Failed on every first exposure

Post by chad » Tue Jan 29, 2019 1:21 am

Hi Mike,
No, a USB3,0 camera with a USB2.0 cable, yes, it will be recognized as a USB2.0.
But this value of bIsUSB3Cam will be true. the another value of IsUSB3Host will be false.
Thanks
Chad
ZWO Driver Engineer
Location:lon=120.6 lat=31.3
SuZhou China

MikeP
Posts: 23
Joined: Sat Sep 23, 2017 4:44 am

Re: ASI 120 Exposure Failed on every first exposure

Post by MikeP » Wed Jan 30, 2019 5:18 am

Thanks Chad!

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