lpalbou

And as time goes by, I managed to compile a 40s video out of 3h capture I did. The setup was not ideal (135mm f1.8, nikon z6ii) but this was my secondary setup so I was playing. In a way, at that focal length, one could call it lucky imaging ! Enjoy

I managed to get this. Single shot unprocessed 13s exposure at F1.4 with Sigma 40mm:

Well, I am traveling so I only have my Lunt 40 with me and my SW AZ GTI after 5 years of loyal services has now passed away.. But I still manage to capture a few timelapses from the south of France where the weather has been cloud free for over a week. Quite impressive compared to Paris or the Alps actually. Full disc (video link) Closeup from full disc (video link) My full disc is 3053px and the eruption extended over 300px, so the approximate size was 68 000 km, or ~5.4x earth diameters. It culminated at 16:15 UTC.

First, thanks a lot Roy, it's great to have access to a raw image Second : wow. It really is very flat on a FF sensor and extremely well corrected. I am genuinely impressed. There is tiny (but strong) vignetting at the extreme corner, but so small it wouldn't bother anyone. The only "flaw" is the speed of the scope, which in narrowband is gonna be complicated to manage (probably 10mn long exposure+) but if time is not an issue (eg those people who have 200+ sunny days per year !), it's a beautiful and very well priced instrument. I was fancying the idea to buy one as a polyvalent instrument, including to do grab & go Solar Ha imaging. I am hesitating however as it's a petzval design with the reducer included and normally you don't want any reducer before the Quark for instance.. (the optics heat up quickly). However it should be possible to use it with an (expensive) ERF. If I ever buy it for that purpose, I will try to report it here. Maybe last question : does it have an internal filter thread on the hood ? That would be very convenient

Thanks Roy, most aberrations seems nicely controlled. I am just a bit surprised by the relative star bloating, but this wouldn't be a first on Askar telescopes and it's usually well managed with a luminance filter (eg astronomic L3). Any other tests with longer exposure in full frame ?

Hi Roy, I am very intrigued by this little scope. When you look at the spot diagram, it seems to perform even better than the 65PHQ.. and this is possible since it's a slower focal ratio. Could you share some test images in full frame ? Once thing that I don't quite get however is.. what will be the interest of the 65PHQ ? The 71F also has the flattener.. there may be one ED glass difference.. but if the first ED glass is good, differences would be minimal, while the price difference isn't