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 Post Posted: Tue Sep 12, 2017 1:33 pm 
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Joined: Tue Jan 10, 2017 7:27 am
Posts: 5
Hello,

the problem is not new but I still did not find a solution to this. I tried to search google but in every forums or user group I just find people with the same problem but no solution.

I am speaking of the problem that blue / OIII flats have a very strong pattern in them and are unusable, see the example image below:

Image

The top row is (R, G, B) flats, the bottom row is (Ha, OIII) flats. The Ha and OIII flats have been taken with long exposure time (30s) but it doesn't matter, I tried very short (0,5s), medium (2s) or long exposure, all the same result.

This problem only occurs in blue spectrum so it has to be some kind of reflection. Is there a official statement from ZWO about this issue and how it can be solved?

Best regards,
Denis


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 Post Posted: Wed Sep 13, 2017 1:37 am 
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Joined: Thu Feb 21, 2013 2:51 am
Posts: 2127
sorry, we heard such feedback from customer
we also ask this to panasonic but get nothing from there

I think you can calibrate your data well with this flat right?

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Location:lon=120.6 lat=31.3
SuZhou China


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 Post Posted: Thu Sep 14, 2017 7:18 pm 
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Joined: Tue Jan 10, 2017 7:27 am
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Hello Sam,

I was able to fix the blue filter by flipping it around but OIII still has the same problem even after turning it. Did you change anything between v1 and v3 of the camera on the cover glas? I have talked to some people that use the v1 and they seem to not have this problem.

Best regards,
Denis


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 Post Posted: Mon Sep 18, 2017 6:02 pm 
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Matariki wrote:
Hello Sam,

I was able to fix the blue filter by flipping it around but OIII still has the same problem even after turning it. Did you change anything between v1 and v3 of the camera on the cover glas? I have talked to some people that use the v1 and they seem to not have this problem.

Best regards,
Denis


no, sensor is the same

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ZWO Founder
Location:lon=120.6 lat=31.3
SuZhou China


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