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After a short panic, clearing up amp glow, now resolved thanks to the help of the good folks here on SGL. Thanks. ?
I thought it only fair to show the finished item
I know I'm not great at processing but its fun
I proceeded to do a quick process of my narrowband image of NGC 1499 ( part of )
I did try SHO and other variations but decided I like the colour and detail of HHS with this image.
Processed in Pixinsight.
TS 65EQ f6.5 with Atik EFW3 and Baader fast f/2 Ha and SII. ( Astrodon 3nm on order )
ZWO OAG with Lodestar X2 guide cam
ZWO ASI183mm Pro
Mesu 200 mount.
20 x 300s Ha
10 x 300 SII
Thanks for looking.
With the weather here in the UK being so bad recently, and with work commitments and other boring life stuff going on I haven't done much imaging lately, but I did finally manage to get out and grab some OIII data a couple of weeks ago to go with my old Ha data of NGC 1499 from back in September. The Ha data was from first light for the newly modded D5300 and Baader Ha filter.
We have an outdoor sports facility only a couple of hundred yards from our house, and annoyingly the ridiculously bright floodlights don't turn off until after 10pm on weekdays, so even though there was no moon to contend with, I had no choice but to wait until the lights were off before I could start shooting the OIII. I thought about shooting more Ha while I waited, but in the end I decided to shoot some short subs without any filter, just to use for RGB stars. I stupidly didn't use my IDAS-D1 filter, and the scope ended up pointing almost directly at a streetlight for all the RGB subs. The result was a stack that had a simply insane gradient running through it, and which made gradient reduction on the stack impossible, as it was changing so much between subs. In the end I had to run gradient reduction on each individual RGB sub before stacking, and then run it again afterwards! Thankfully I only shot 20, so it wasn't too laborious. In the end I had something which, despite having a really ugly background, did at least have useable stars.
As for the OIII, boy was the signal weak with this one. I'm used to dealing with weak OIII signals on the D5300a, but this one really took the biscuit! Thankfully J-P Metsavainio's tone-mappng technique allows one to get the sledgehammer out for such cases, so I was able to stretch it far enough to get something out of it (even if it doesn't yield any fine structural detail for the OIII).
So this is 23 x 8 min Ha, and 9 x 20 min OIII subs. Calibrated with Flats and Bias, and dithered aggressively. The stars are made up of 20 x 90s subs. Everything shot at ISO 200.
The usual gear was used, HEQ5 Pro Mount, SW 80ED (with FF/FR), guided with PHD2 and a Finder-Guider and Legacy QHY5. Captured with SGP, pre-processed in APP, and processed in PS.
I have to say, I really like having the stars in a separate layer in PS. So much so, this is how I'm now going to process all my images from now on. It makes things so much easier being able to adjust whatever I want and not have to worry about constantly protecting the stars.
I'm not actually finished processing this one, but I thought I'd post it up for now anyway, and update it later. I still haven't ran any noise reduction on it yet, so I need to do that next, but hopefully the final version will not look much different to this. I did have some fun playing with the colour on this one.
I have noticed today though, that it looks quite different on my work Dell monitor compared to my cheap Korean one from home. I think it looks a bit duller today, but I'm just not sure! What do you guys think, does it need more or less of something in particular? All comments welcome, I'm always looking to learn!
Not done any deep sky imaging for over 3 years. A few changes in personal circumstances have meant a new lease of life back into the hobby. So here's 80 minutes worth of 10 minute unguided Ha subs using an SX H36 camera through a Tak FSQ106 mounted on a Paramount MX+. Taken on Friday evening when I had to be up early on Saturday to get the train down to London to attend Astrofest. Calibrated the image with some flats, bias and darks taken on Sunday Morning.
Minimal processing (trying to remember how to use Pixinsight) so stacked in DSS, some basic stretching in PS. I'm happy I'm back in the saddle again. I think I'll try and add some more data to this one before the winters out.
Thanks for looking
So I was looking at having a go at NGC1499 with an unmodded D5300. After having a quick look, is it even worth it? I've had a try anyway and I'm currently running an 8 minute stack under light polluted skies. Preparing myself for some disappointment here. Can I get away with just adding more data under better conditions? Because I was shooting at 70mm on a standard tripod my exposure times are somewhat restricted. If there's anything at all from this stack I'll post it up but I'm not holding my breath
First attempt at imaging in a while. Probably not a good idea to try this with an unmodified DSLR, but I figured I would give it a go. Only 10x300s subs before the moisture levels really started to rise and everything just became soggy. Lots of problems with guiding as well, 8 out of the 10 had some kind of guidance error show up in the frame (fortunately they were straight lines out and bak in one of the cardinal directions so they mostly got cleared up in stacking). Final image is horribly noisy due to the poor quality of the starting frames, but I am at least back in the saddle again. Someone remind me where PixInsight put the "Silk Purse from Sows Ear" function, I seem to have lost it
To give you an example of the frames I had to work with:
Lights: 10x300s @ ISO800; Darks: 112; Bias: 489; Flats: 35
Scope: Skywatcher ED80-DS Pro
Camera: Canon D60 (unmodified)
Mount: SkyWatcher AZ-EQ6 GT
Guiding: Skywatcher ST-80 and Lodestar X2 using PHD
I tried to move from ISO400 to ISO800 as I read that it helps with the horrible banding from the Canon camera, however now I end up with bright stars blowing out ;(