These are two images from last night, both 5-minute subs using my cooled 450D with the 130P-DS and a 7nmn Ha filter. They have been stretched in FITS Liberator and very lightly adjusted in photoshop, and some very gentle denoising in Astra Image. This is because they subs were very dark so I wanted to make full use of FITS Liberator’s ability to stretch 32-bit data.
The wizard is 30 frames, the Crescent is 22. There’s quite visible ‘posterisation’ if you zoom right in with the faintest areas, so if it’s clear again tonight I will repeat the exact sequence with the hope of doubling my subs and doubling the range of pixel values. Very pleased with the lack of noise. Now to dig out my RGB ones and try making LRGB versions.
What’s App addicts will know that Andy, Rob and I went to Brankley Pastures for a night of astronomy and dog-worrying. They showed me some interesting objects and I got to see M51 with my own eyes! I even found a few Messier objects with just a 30mm finderscope. I think all three of us thought the best thing was a brief clear sky when, even before it was fully dark, we could see the milky way right through Cygnus and beyond.
Thin cloud made me think I wouldn’t get more than a couple of decent subs of the Eastern Veil but in the end about 12 of them showed good scores and decent shaped stars. I added these to subs from 5 August. I’m actually quite pleased with how the end result turned out, especially the greeny-blue (AKA Cyan) bits of OIII – one of the few nebulas where this is easy to photograph with a DSLR:
Rob, Neil and I are at Brankley pastures conservation area near Hoar cross hall tonight observing in field. Currently lot of cloud but earlier on great view if Milky Way with kit of structure especially around Cygnus. M101 was very large occupying 60% field of view in 30mm OVL Aero eyepiece in Rob’s 14 inch Don with bright core. M57 big and bright with Baader Zoom 8-24mm set to 12mm and with UHC filter. Showed internal structure that demonstrated that, although centre cleared relative to ring, it isn’t empty but has network like internal filling. Central star not seen. Both cores of M51 seen with 14 inch Dob with Baader Zoom at 24mm, and we also saw Owl Nebula through light cloud using Baader Zoom with UHC filter in same eyepiece. I think I was able to faintly just see Witch’s Broom without UHC but before I could add UHC cloud came in and prevented further observation. Great reasonably dark observing siteonly minutes from home but you probably want to do with others as feels a bit isolated.
With quite a lot of cloud we resorted to unconventional means of observing. With 30mm finderscope we could all see M31. We could also see it in Vixen 2.1x binoculars. I was able to just make out M33 in the 30mm finderscope, and also the brightest portion of NGC7000 in the Vixen 2.1x binoculars.
M13 seen in Dob and 2.1x binoculars and Neil got a picture of Eastern Veil Nebula.
Last night I discovered my guiding disaster at Rosliston was because my laptop woudln’t work with my camera any more. Sorted today by removing and reinstalling the ZWO drivers.
For last night, I had to spend nearly an hour getting my Touptec Mono to guide for me.
Then this morning, really struggled to process my data, in the end I found putting the autosave.tiff file into Astra Image worked. 1hr 35 minutes of 5-minute subs, 130P-DS, 450D, modded and cooled. HEQ5, guided.
I couldn’t get my guidescope to focus after Fridays (fascinating) RAG meeting, so my plan to do Ha on the North America Nebula flopped.
I did managed to get some semi-widefield subs of the NAN with my 135mm lens and the 1000D. For some reason the focus drifted off over the first hour until the stars turned into circles, but I caught it in time and got about 130 stackable 30-second subs.