Hard frost 18F [-8C] air temperature. 21F [-6C] inside the dome meant dewed optics.
The flexible dome skirt was frozen in place with snow and ice until I cleared it all manually.
Hours of heat bands and repeated use of the hair drier on the D-ERF, objective, filters and etalon didn't help much.
Even the GPCs were misting over as I fitted them to the camera nose. More blasting with the hair drier.
I was getting a glazed, "frozen rain" look on every processed image out of ImPPG at default settings.
Imagined the camera sensor was dewed but it wasn't. SharpCap said the camera was at 23C [73F.]
So just before lunch I removed the entire H-a filter stack and etalon for a quick, white light capture.
Left the Baader D-ERF in place. Lacerta 2" wedge. ZWOASI174MM + 2.6x GPC on the 1.25" nose.
Not a great image but I have to be grateful for any sign of the sun in winter.
- 26.12.2021 11.33 CET 1.25x 2.6x.jpg (39.92 KiB) Viewed 268 times
so different to here in the UK where it is mild but cloudy. That's an excellent WL, you should take them more often 
