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 Post subject: Re: ASI071mc Dewing
 Post Posted: Wed Sep 13, 2017 1:40 am 
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Joined: Thu Feb 21, 2013 2:51 am
Posts: 2274
frogbot wrote:
@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 !


this is humidity indicator, not required actually

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 Post subject: Re: ASI071mc Dewing
 Post Posted: Wed Sep 13, 2017 1:42 am 
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we are going to upgrade the 071 cooled version to ASI071MC-Pro which has a new body and better seal
also build in DDR3 buffer

and we will provide upgrade service for old 071 customers who have dew problem

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 Post subject: Re: ASI071mc Dewing
 Post Posted: Wed Sep 13, 2017 3:14 am 
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Posts: 41
Sam wrote:
we are going to upgrade the 071 cooled version to ASI071MC-Pro which has a new body and better seal
also build in DDR3 buffer

and we will provide upgrade service for old 071 customers who have dew problem


That is great news. Do you think the upgrade will be user installable, or will we have to send our 071MC back?


Brian


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Wed Sep 13, 2017 7:49 am 
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bvalente wrote:
Sam wrote:
we are going to upgrade the 071 cooled version to ASI071MC-Pro which has a new body and better seal
also build in DDR3 buffer

and we will provide upgrade service for old 071 customers who have dew problem


That is great news. Do you think the upgrade will be user installable, or will we have to send our 071MC back?


Brian


Hi Brian
this is completely a different product
everything is changed include the retail price
so customer have to send back the camera to dealer for upgrading
and this upgrading will also need to pay the price difference

so just waiting for us to release the new product in next month

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 Post subject: Re: ASI071mc Dewing
 Post Posted: Wed Sep 13, 2017 11:14 am 
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Joined: Thu Sep 10, 2015 9:57 pm
Posts: 17
I will be interested in this upgrade too, I have had to do the tablets 3 times now.


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Wed Sep 13, 2017 1:41 pm 
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Joined: Sun Aug 06, 2017 2:29 pm
Posts: 5
Hi
thanks every one for your answers.

I'm cooling until -15° by step of 5° with a pause of 5mn at each step, so I'm living in France and the temperature is around 20° right now so it takes 35mn to reach -15.

@Sam this upgrade is really good news and for sure I am very interrested ..if it is not to much expensive for "old" 071 users :)

Keep us in the loop !

JL


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Sat Oct 07, 2017 5:20 pm 
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Joined: Sat Oct 07, 2017 4:26 pm
Posts: 5
This is to document that I too have had dewing problems, from my very first imaging session a couple of days ago.
During imaging (set point -20C), it became clear that ice crystals were gradually growing from one of the long sides (bottom) of the sensor. By the end of the evening, this was taking up almost half of the sensor area.
At the end of the evening, the problem was captured through the use of Flats – which were unusable during subsequent image processing.
I attach a sample Flat, so the extent of the problem is clear.

During processing, it was obvious that there was also a more general dew problem in terms of a general 'clumpiness' throughout much of the frame. This manifested as a granular texture. This was mitigated through moving the black point – which was OK for stars, but tended to interfere with nebulae. The granularity disrupted the representation of fine detail with the nebula.

These problems will almost certainly affect my previously-prepared dark libraries – which will need to be replaced once the problem has been resolved.

I will work through the options documented in this thread, but can see that it may be necessary to open up the camera periodically to dry out the dessiccant tablets.

A better-sealed camera would be the way forward.


Attachments:
ASI071-Cool first imaging session sample Flat.jpg
ASI071-Cool first imaging session sample Flat.jpg [ 803.69 KiB | Viewed 272 times ]
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 Post subject: Re: ASI071mc Dewing
 Post Posted: Sat Oct 07, 2017 6:05 pm 
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Joined: Sat Dec 31, 2016 12:30 am
Posts: 41
Sam wrote:

Hi Brian
this is completely a different product
everything is changed include the retail price
so customer have to send back the camera to dealer for upgrading
and this upgrading will also need to pay the price difference

so just waiting for us to release the new product in next month


Hi Sam

Any update on the new product release?


Thanks

Brian


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 Post subject: Re: ASI071mc Dewing
 Post Posted: Sat Oct 07, 2017 6:24 pm 
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Joined: Sat Oct 07, 2017 6:11 pm
Posts: 1
I too have been experiencing the dewing problem with my ASI071mc. I can't go below 2 c without risking dew or frost. I'm wondering if I have the longer 6mm screw. I measured the screw from the top of the head to the bottom of the threads and it measures about 6mm (see attached images.) Is that the proper way to measure the screw? If I leave the head out of the measurement then its only 5mm, hence my uncertainty. When the screw is fully inserted the head part of the screw is not flush with the camera body but sticks out (see attached photo.)

I did email ZWO with this question a few weeks ago but never got a reply.

I've also considered cutting the screw to 5mm myself though that is risky and I also want to make sure I really do have the screw that is too long before I attempt that. Even better though would be getting a replacement screw from ZWO.

I think I'm also going to have to open the chamber and dry out the desiccant tablets in the oven.

Brad.


Attachments:
File comment: Screw fully inserted into camera body
20170916_141530r.JPG
20170916_141530r.JPG [ 31.9 KiB | Viewed 271 times ]
File comment: Screw length is 6mm including head.
20170916_141403r.JPG
20170916_141403r.JPG [ 58.57 KiB | Viewed 271 times ]
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 Post subject: Re: ASI071mc Dewing
 Post Posted: Tue Oct 10, 2017 11:32 pm 
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Joined: Sun Apr 10, 2016 9:19 pm
Posts: 17
Location: Germany, near Düsseldorf
Hello,

I registered as a new member in this forum since I bought my new ASI071 in July this year and, as many others, got promptly problems with dewing.
Now, its my first test to dry the camera with the additional 2 tablets and the tube and I will figure out, how long it takes before I get new dewing problems.
One question to the community:
Is it a problem, to use the camera with continuously mounted tube + tablets?

Best regards
Joachim


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