DaveS

Yup.

CN might be Cloudy Nights, but HCN is hydrogen cyanide. Hmm...

I dislike the moon with a passion, but unfortunately we need it, not just for tidal stabilisation but for resources and as a staging post for solar system travel, so best give it a paint with Black V3. Otherwise I'd say collapse it into a Black Hole and be done with it.

Whenever you put socks in the washing machine one will be exchanged for a hideous pink and green monstrosity from the planet Zog. Washing machines are the best wormhole generators known to humankind.

Part of the Coma galaxy cluster during "Galaxy Season". It's not as good as I'd like as I've been having no end of problems with Flats calibration so had to push the background down further than I should like.

Realistically it's a good 7 hour round trip from here, even assuming I could find a parking space in the car park. All the astro shows are a long drag for a day trip.

OK, to get back to my original question, which I think has been answered. What I have taken from this discussion is that if I use the SPCC script in PI then I don't need to worry about G2v calibration and can use the same exposure for each filter. NB is another ball game entirely, and needs another thread.

Thanks for all the replies guys, plenty for me to take on board. Regarding LP it's mainly to the east (Weymouth), and west (Bridport). To the south the nearest town of any size is in France, about 350 km away. I will give the replies the attention they deserve, and try to come back with a sensible post tomorrow.

Couldn't get Venus and Mercury, as they were too low down behind all the vegetation in the SW, but managed the others, bins for Uranus and Neptune.

Yep, saw that vider. He's definitely not happy!

That's what I took from the video, that SPCC made the corrections for filter transmission and sensor QE that G2v calibration deals with.

TBH I'm not sure what I'm asking. What I've been doing with the G2v calibration (Whish I should re-do to improve its accuracy) is adjusting the exposure through each filter to make the backgrounds at least approximately the same. I'm thinking, will having different exposures affect the result, or doesn't it matter?

If this is in the wrong place then I trust the Mods to move it. I've been doing my stacking and post in AstroArt V8 up to now, using a first order G2v calibration to equalise exposures in the R, G, and B channels but I may be moving to PixInsight after watching Adam Block's video on the SPCC script. The question I have is: Should I keep the G2v calibration in my exposures, or will this interfere with the SPCC process? From the video it looked like he was using equal exposures for the separate RGB channels.

If you already have AstroArt (Which version?) then why not stack and combine in AstroArt? The stacking is very fast, and the RGB combination tool is now very much better than it was when I first started using AA, in V5.

Well, I don't know about "written by monkeys" but it's certainly written by mathematicians, for mathematicians, possibly working in a little hermetically sealed bubble, with no reference to the outside world. I did start the 45 day trial, even bought Warren Keller's book, but it still did my head in. That being said, I've been looking at some of Adam Block's YT videos which make things a bit clearer, so will likely be purchasing a license in the new year, when I have a new computer with the power to run the software well.

A Schmidt corrector plate is very nearly plane parallel, but not quite. On side will have a very slight, very complex aspherical surface only a few wavelengths deep. Roughly it's the difference between a sphere and a parabola of long focal length.

From what I've read the outer halos of M31 and the Milky Way may already be colliding.

AstroArt 8 for stacking and post. Occasionally I'll stack in DSS on the odd occasions AA doesn't like my data (Mostly NB) and finish in Affinity.

APS-C sensors can be used with 36mm unmounted filters, beyond that 50mm round unmounted are needed.

Not envious at all. Yeah, right 🤣. The caldera is well worth a tour.

I just watched Adam's video on YT, and I guess I'm convinced. Damn, gonna cost me ££££, as I really need a new workstation since my 11 year old gen 2 i7 is probably marginal at best.

Since I'm something of a galaxy obsessive BlurXT might be exactly what I'm looking for.

Just giving a "Like" isn't nearly enough, that's a fabulous image. I've been fighting the same target with my ODK 12 / G3 16200 and not getting anywhere near that. Bravo!

I had the free trial some time ago but it was on a very small boot drive which was getting clogged up by junk and something had to go. I now have a much bigger boot drive but I may specc out a new machine for PI. I can save a bit by foregoing Win-Dross for Kubuntu. Even Warren Keller's book didn't help.