cheezes simon that is unbelievable with a 60da from an LP sky
i do not understand however how you incorporate the normal light with the ha light and where?
i have googled it a number of times but i do not get it really!
pat
Thanks Pat, there's still a lot of room for improvement.
There are no 'normal' RGB lights in the shot.
The colour image is only a combination of the Ha and the OIII data, where the Ha is mapped to the red channel while the OIII is mapped to both the green and blue channels.
There is another method that maps Ha to red and the OIII to green as before, but then a combination of the OIII with a small percentage of Ha is mapped to blue, this is supposed to replicate a H-beta filter.
I tried this method and the colour did look better but I stuffed up my process somehow and the overall image was poor. I haven't had time to go back and start over.
i must pursue the item a lot more vigorously looking at the results now
pat
Oops, we've kinda derailed this thread, sorry Barry
Definitely worth pursuing.
The subs were 10mins with a little 70mm achro at f6.
The Carina neb is ofcourse very bright, but I reckon with the 102 f5 you have you'll be laughing.
I recently did some test shots with a 6" newt at f2.8 (~f3 light grasp when accounting for central obstruction) and Carina's core would be overexposed at anything over 5 min subs!
Same result with M8, overexposed core when over 5 mins.
The newt still needs some fine tuning before I can get serious with it tho.
I'm out of town at the moment, back on Saturday, hoping for clear skies. Another night or two like the first one would be great. I would love to get a clear enough night like that again especially if I've got the 28 cranked up and running.
Friday night was awesome in Dryandra! My SQM gave an average reading of mag 21.6.
When I finally decided enough was enough at around 3am, my black pelican case for my camera and lenses was white with frost and there was ice forming on parts of the Astrotrac's pier.
I thought about taking a photo of the frost/ice but BRRRR!! I just wanted to get inside and sit in front of the fire pronto.
The bogan boots(UGGS) worked perfectly, my feet were toasty all night.
Quote:
Originally Posted by MrB
Here's the difference between nice dark country skies and suburban hell. Had to stretch heavily to get it even close.
That was probably an unfair comparison(very slightly), the Nannup image looks like it was shot with the lens wide open(f2.8)
Here is a new comparison with 1x 5min sub from the 5 hours of data I got while in Dryandra over the weekend.
All gear and settings are the same for both shots with the only exception being the sub length.
The single Dryandra sub was a very quick and basic process for the purpose of the comparison.
It is easy to see the 60min stack has had to be pushed very hard.
I'm now going through the 5 hours of subs to weed out the sub-par subs, can't wait to stack and play with this data!
Friday night was very dark, the seeing was a bit average but the transparency was exceptional. It go so cold ice formed on the shroud of the 25" and I'm glad I've got heavy-duty anti-dew systems on it. I was out near the lakes on the way to York.
Only downside was the ice that formed on the ramp up into the trailer. I slipped on it while pushing the scope back in and ended up slightly bruised and battered. Fortunately no damage to the scope!
Staurday looked good, but my leave pass had expired.
Cheers,
Andrew.
Ouch Andrew!
Saturday wasn't looking good from Dryandra while we played a couple of rounds of bush golf, but eventually the cloud cleared and it was perfectly clear. By the time I was setup and ready to go tho, new thin high cloud had rolled in from the west
I'm now going through the 5 hours of subs to weed out the sub-par subs, can't wait to stack and play with this data!
I seem to be chasing my tail trying to get the most out of this, I am definitely no good at processing! haha
Every time I try to use the calibration files(darks/flats/bias) everything goes to crap, dunno why.
This was just some mucking around(curve tweaking/slider sliding) I really need to follow some of the tutorials out there to make this pop.
This is about half of the lights(~2.5hours) only, no calibration.
Lots of jpeg compression artifacts even at such a small size due to the 200k file limit here.
What software are you using for the calibration? That data looks pretty damn good, nice and sharp and it went fairly deep if you can get that much out of it with only a levels and curve stretch. Dare I say it, but the scripts in pixinisght take all the pain of calibrations away! Personally, I like the more muted tones of the colours in this version.
I'll say ouch - I've got a lump on my head and a nice big bruise on my shoulder from being driven into the ground by the wheelbarrow handles of my scope, and then run over by it! I think my nice soft squishy body protected it, though.
cheers,
Andrew.
What software are you using for the calibration? That data looks pretty damn good, nice and sharp and it went fairly deep if you can get that much out of it with only a levels and curve stretch. Dare I say it, but the scripts in pixinisght take all the pain of calibrations away! Personally, I like the more muted tones of the colours in this version.
I'll say ouch - I've got a lump on my head and a nice big bruise on my shoulder from being driven into the ground by the wheelbarrow handles of my scope, and then run over by it! I think my nice soft squishy body protected it, though.
cheers,
Andrew.
I seem to be chasing my tail trying to get the most out of this, I am definitely no good at processing! haha
Every time I try to use the calibration files(darks/flats/bias) everything goes to crap, dunno why.
This was just some mucking around(curve tweaking/slider sliding) I really need to follow some of the tutorials out there to make this pop.
This is about half of the lights(~2.5hours) only, no calibration.
Lots of jpeg compression artifacts even at such a small size due to the 200k file limit here.
That data looks pretty damn good, nice and sharp and it went fairly deep
Cheers Guys. Still a long way to go before I'm happy with it.
Not sure about sharp, maybe at the scale shown here The only lens I have available that gives the image scale I wanted has pretty severe red CA.
Quote:
Originally Posted by alocky
What software are you using for the calibration?
I use AstroArt v5. I also downloaded the demo of Nebulosity and I also get weird results when using the calibration files, obviously I'm doing something wrong.
Quote:
if you can get that much out of it with only a levels and curve stretch. Dare I say it, but the scripts in pixinisght take all the pain of calibrations away!
Yes just mucking around in Lightroom and CS2.
My processing goes something like this:
Think I'll move this slider, hmm yeah that looks better, I wonder what this other slider does... umm nope, undo.
I have no I dea what I'm doing in post haha (or pre for that matter... re: calibration )
I did trial PI a long time ago, it just seems impossible to use at my skill level.
Quote:
I've got a lump on my head and a nice big bruise on my shoulder from being driven into the ground by the wheelbarrow handles of my scope, and then run over by it!
Damn that doesn't sound good! Is there anything you can get to add some grip on the ramp?
