Keep in mind 185mm Askar need lot to cooldown.
For me its approx 4-5 hours minimum, and then it provide maximum of his performance.
If cooled less than 4 hours, image is still not as sharp.
Denis,
Are you bringing your 185 from inside a warmer environment and needing 4-5 hours cooldown?
My 185 sits in the observatory with ambient temps, so once I open the roof and take off the lens cover it takes 30-45 minutes at most to reach optimal image quallity.
During the coldest part of this winter I spent quite a bit of time observing and imaging with the 185, and was impressed at how well it performed in temperatures well below freezing.
I use a dew heater to prevent frost on some nights, keeping it at a low setting.
Mike