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Severe Chip or Cover Glass Reflexion on ASI1600-MM
http://zwoug.org/viewtopic.php?f=21&t=7568
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Author:  starhopper [ Tue Nov 14, 2017 6:27 pm ]
Post subject:  Severe Chip or Cover Glass Reflexion on ASI1600-MM

Hello Forum,

I am using a ASI1600MM-C for nearly one year with great success. Last month I discoverd a very strange behaviour around bright stars. Estimations of the light path lead to the conclusion that it is
scattered light from the cover glass or the chip itself. Reflected by the filters in the filter wheel.

It is mostly seen with reflectors, and occured with ZWO and Baader filters (in right direction). It is seen heavy on narrowband filters but is still present on broadband LRGB-filters.

Is there a replacement glass available or a trick to reduce this strange backscattered light

Vega 60s with a 8" f/5 Newton, Baader H-Alpha Filter
Attachment:
Chip-or-Cover-Glass-Reflexion.jpg
Chip-or-Cover-Glass-Reflexion.jpg [ 477.89 KiB | Viewed 174 times ]


Thomas

Author:  Sam [ Wed Nov 15, 2017 12:58 pm ]
Post subject:  Re: Severe Chip or Cover Glass Reflexion on ASI1600-MM

sorry only sensor factory can do something with the sensor
but you can let the sensor face the opposite of the filter wheel
so the distance from sensor to filter is longer
then refection should less

Author:  starhopper [ Wed Nov 15, 2017 6:58 pm ]
Post subject:  Re: Severe Chip or Cover Glass Reflexion on ASI1600-MM

Sam wrote:
sorry only sensor factory can do something with the sensor
but you can let the sensor face the opposite of the filter wheel
so the distance from sensor to filter is longer
then refection should less


Ok, that light is scatterd from the Chip not from the glass of the ccd chamber, isn't it?
So, it is not usefull to change that glass.

Author:  Sam [ Tue Nov 21, 2017 1:52 pm ]
Post subject:  Re: Severe Chip or Cover Glass Reflexion on ASI1600-MM

the protect window of the camera is AR coated
so I think the reflexion is come from the sensor glass which is not coated

Author:  starhopper [ Tue Nov 21, 2017 7:05 pm ]
Post subject:  Re: Severe Chip or Cover Glass Reflexion on ASI1600-MM

Sam wrote:
the protect window of the camera is AR coated
so I think the reflexion is come from the sensor glass which is not coated


OK, thanks for clarification, I would not change the sensor glass.
Thomas

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