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Christian Müller <[log in to unmask]> writes:

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>
>> When I have the live camera feed there are lots of small
>> circles with smaller rings inside.
>
> We experienced apparently similar 'artefacts' in a Spot-camera about
> once every 2 years due to humidity accumulation in the camera.

[snip]

This is a very useful tip in general but as far as I am aware all the
Hamamatsu cameras now have a vacuum sealed head and so should not have
this problem.

Ian