It suddenly, and quite unexpectedly, cleared again this evening, around 8 P.M. The weather forecast had predicted partially clear skies, but on the satellite images, it looked like it wouldn't reach this area.
I immediately put the ED152/1200 out for cooling, while I took a shower. Temp outside was around +7° and the delta was about 15°C. There was quite a bit of wind, which helped. I left the dewcap all the way back and the focuser open, to assist the cooldown as much as possible. Half an hour later, I had the scope set up. Setup takes less than ten minutes.
The scope was very nicely sharp at 96x and very, very slightly soft at 120x in my old 45° binoviewer with 25mm and 20mm Zeiss microscope eyepieces. The seeing was very mediocre, although with an occasional moment of better clarity. This was definitely in the atmosphere and not the telescope, because I could see the turbulence move with the wind.
That the scope is usable at a magnification of 120x after just half an hour cooldown is great news. This means it has potential to be used a lot more often than I thought at first.
The performance obviously improved markedly during the hour or so I got, until the clouds returned. Sadly, the seeing deteriorated badly, once the clouds began to come rolling in again, so I couldn't take much advantage of the better correction. I did get a few, brief moments of stunning clarity, but that was about it.
Even after just half an hour cooldown, there was absolutely no hazy glare in the images whatsoever, unlike the first objective, which would never give a clear view of the Moon at full aperture, despite hours of cooldown. Images are startlingly clear, sharp, bright and with stunning contrast. The color correction is astoundingly good. And thanks to the sliding dew cap and the short tube, thanks to the long back focus, it's nowhere nearly as unmanageable as its stats would lead one to believe. During mounting, it feels more like an f/6, than an f/8.
I am starting to like this scope A LOT.
Edited by Astrojensen, 08 December 2019 - 04:12 PM.