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 Post subject: Re: ASI071mc Dewing
 Post Posted: Tue Aug 08, 2017 1:04 am 
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Jeanluc wrote:
You are saying that desiccant tablets works better inside the camera, Can we open it ( and how) to put the tablets inside and is there space to put them and how many can we put inside ?
Thanks


there is already desiccant tablets inside the camera
we put 4 total on the PCB board, we used double side adhesive tape fix them
so yes, you can open the blank cover and redry the tablets
this is the most effective way to dry the CMOS chamber
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 Post subject: Re: ASI071mc Dewing
 Post Posted: Wed Aug 09, 2017 12:56 am 
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I never push the cam @-15C and never see ice but i can visually see dew @-10 C on the sensor with a brand new camera (2 nights usage)

Is there a serial number for the first 071 batch, or something i can check to see if i get the long screw without opening the camera ?
Can i check for this defect externaly ?
I buy this cam in the first day of july 17.

I'm preparing for the summer sessions on august and really want to avoid opening the cam since then.

Did you have internal photo of the ASI071 as you provided for the ASI1600.
I can only see 2 dessicants tabs looking thru the clear AR glass.

As i understand, the better method to dry the cam, is to open it and change the Four dessicant tablets with four hot new tablets, then seal the cam and wait for more than 2 days.

thank for your help


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Wed Aug 09, 2017 1:46 am 
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hoxca wrote:
I never push the cam @-15C and never see ice but i can visually see dew @-10 C on the sensor with a brand new camera (2 nights usage)

Is there a serial number for the first 071 batch, or something i can check to see if i get the long screw without opening the camera ?
Can i check for this defect externaly ?
I buy this cam in the first day of july 17.

I'm preparing for the summer sessions on august and really want to avoid opening the cam since then.

Did you have internal photo of the ASI071 as you provided for the ASI1600.
I can only see 2 dessicants tabs looking thru the clear AR glass.

As i understand, the better method to dry the cam, is to open it and change the Four dessicant tablets with four hot new tablets, then seal the cam and wait for more than 2 days.

thank for your help


your can unscrew the chamber seal screw and measure the length of it
the short one is 5mm and long one is 6mm (screw only)

I think you can attach the desiccant tube if you don't wish to open the camera
just put the desiccant tablets into microwave oven for 2 mins before use it.

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 Post subject: Re: ASI071mc Dewing
 Post Posted: Sun Aug 13, 2017 12:45 pm 
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Hello

I used the extention tube with 2 tablets that I put in the microwave before and wait 24h .....didnt works I still had dew at -5°c!!!!

I finally open the camera and there were 3 tablets I put them 2 minutes in the microwave (700w) and put them back with an additional one from the kit that comes with the camera (they are thicker that those in the camera) and wait 48 h ....now I can go to -25 without dew neither ice !!!


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Mon Aug 14, 2017 9:00 am 
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Jeanluc wrote:
Hello

I used the extention tube with 2 tablets that I put in the microwave before and wait 24h .....didnt works I still had dew at -5°c!!!!

I finally open the camera and there were 3 tablets I put them 2 minutes in the microwave (700w) and put them back with an additional one from the kit that comes with the camera (they are thicker that those in the camera) and wait 48 h ....now I can go to -25 without dew neither ice !!!


yes, put desiccant tablets into the CMOS chamber is the best way to get rid of humidity

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 Post subject: Re: ASI071mc Dewing
 Post Posted: Tue Sep 12, 2017 6:14 pm 
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I'm back with ....dewing problem AGAIN !!!
At -10° I have again dew on the sensor. I dont understand I regenerate the dessicant tablet in microwave it works few weeks and now dew is back !!! I dont know what to do. I bought new set of dessicant tablet and put them in standard owen (not microwave) at 200° celcius for 90mn (I use to do that with an Atik and it was working well).
I'm wondering if there is a problem of airtightness in this camera model.

Here are some phtos of the ASI071 open

I'll keep you informed

JL


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Tue Sep 12, 2017 6:51 pm 
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Joined: Wed Jul 05, 2017 12:22 pm
Posts: 5
@Sam - another question - what is the purple element on the board near the screw ?
Image
I !have not! this on my board - camera is second handed and I noticed it while replacing dessicant
today. What is it ?
Thank You !


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Tue Sep 12, 2017 6:56 pm 
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Posts: 41
@frogbot

when you say you have a dewing problem, how long do you allow the sensor to cool down, and how long does the dewing last?


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Tue Sep 12, 2017 7:04 pm 
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Yes - I got dew problems also - but this is not my thread ...
after 30 min of cooling from ambient to -15. Dew was present for about half hour and gone ...
Extra tube solved the problem. But I decided to put new set of them (dessicant) inside. And clean the sensor with air ;-)


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Tue Sep 12, 2017 7:20 pm 
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@frogbot my bad, sorry.

@Jeanluc - just a couple things to confirm/try.

if you get excessive dewing, you might try a slightly higher target temp. During summer months here my target is 0C (instead of my winter -10C or -20C)

your cooldown to target temp should be reached over a period of time - i typically do 30 minutes. Fast cooldown results in dewing

Even then, i find i may have to wait an additional 10-20 minutes for dewing to be completely gone. Having reasonable expectation helps here.

I have the ASI071MC-Cool heater, and from what I can tell, it doesn't really help with anti-dewing

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