So, finally...my Quark has arrived and I have used a hole in the clouds to test it on both of my refractors.
Eyepieces used 40mm Celestron plossl, 32mm Baader plossl and 25mm Vixen NPL. Neodymium as ERF filter.
Did not take long to warm up, but I was probably somewhat overwhelmed by the novelty of both Quark and AZGti. Used Berlebach tripod for better stability.
Quark brings focal ratios to f/24 for Borg and f/31 for Tak, and when viewing I thought that keeping it to 1mm exit pupil was the best for viewing, so NPL in Borg and Baader in Tak. That might change if i stop down Borg to up the f/level as I plan to.
I was fiddling with the tuning, perhaps too much. Initial impressions are that the zero point is not bad, but 9 o'clock probably better. Not sure whether it is also f/dependent so one has to have two settings for two scopes.
In the afternoon I thought that the views were worse and found out that this is because I have not unscrewed the 2inch barrel so the 1.25 nose was not flush. That small tilt induced picture error. I can see some contrast non-uniformity, but so far nothing dramatic. Tak ups the game and really brings it to the next level, the problem is that the seeing rarely cooperate in the city during the day and 40mm plossl is incredibly uncomfortable to look at.
It is incredible how quickly the Sun changes in H-alpha even during the course of one session. It was a quiet day today even in H-alpha but there were prominences, jets, spiculas and one major and two tiny spots.
Next step, play with tuning and figure out what works. Borg has FTF focuser and Tak focuser is not shabby either, so probably no slop there.
Observing hood proved to be invaluable and Baader plossl side-eyeguard is perfect for solar.