Quote:
Originally Posted by Atmos
It’s not easy to see on the Dow samples image but does it look anything like the top part of this image?
If so, it’s kinda dew. ZWO cameras moreso than QHY cameras suffer from frosting of the front cover slip on the camera. On a dewy night it can be good to slowly cool down the camera or even just wait and it’ll slowly disappear. My ASI094 does have an anti-dew setting but it still takes time to work if I cool down too fast. |
Thanks for the comment, Colin. In your image the mottling looks a bit different; the pattern on the sensor in my shots does look more like a systematic grid - would dew do this? Maybe it does!
You're right about the need for gradual cooling; I maxed out the power (100%) and it probably cooled too quickly in the humid air (after which I eased up on the temperature and settled on -5).
Cheers,
Richard