Lancebloke
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NGC224/M31/Andromeda Galaxy - First DSO Image.
Lancebloke replied to Lancebloke's topic in Imaging - Deep Sky
Ok... so here is my second attempt. 46% waxing moon to the left didn't help anything but not sure how I ended up from quite a red picture (from general light pollution) to a very white one. Not sure if that is because of the data quality captured or processing. Likely both since this is only the third image I have shot and processed. -
I am new to this but I normally focus a good as possible at the zoom I want, then use the digital zoom, refocus and the same again until I cant (normally twice). That has seemed to work ok so far. With exposure time, I used 180s exposures for my last attempt which got quite a lit of the fainter detail but blew out the core. Next time I am going to do the same for the detail and then some much shorter (15 - 30 seconds) for the core. See how that goes.
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Deep Sky Stacker Only Using 1 Frame
Lancebloke replied to Lancebloke's topic in Getting Started With Imaging
Hi, Yes, I adjusted the star threshold down to 3% to try and fix the issue. I also used 100% of frames as I manually check them all to remove dodgy ones beforehand. -
Deep Sky Stacker Only Using 1 Frame
Lancebloke replied to Lancebloke's topic in Getting Started With Imaging
Hi, Yes, I am using a Canon 90d DSLR. Thanks. Will try again when I get some favourable skies. -
Deep Sky Stacker Only Using 1 Frame
Lancebloke replied to Lancebloke's topic in Getting Started With Imaging
Hi Happy-kat, The data I captured was trash for that target anyway but I also captured what I could of Andromeda yesterday too. Am I better trying to stack just the 16 light frames and none of the calibration frames I took? Would you recommend a certain ratio of each per light frame or just as many as all of them as possible in the time? -
Hi all, I tried imaging the horsehead nebula yesterday as a bit of a target of opportunity for learning. I have been trying to stack the images with the darks, flats and bias frames I also took at the time but when I do so it tells me it will only be using one frame to stack. If I do the same thing without any calibration frames it seems to work ok. Am i using too many calibration frames? For reference I have: - 12 Light frames (detected c.200+ stars when registering but had to set threshold to 3% because of street and moon light pollution) @ 2 min exposures, ISO 800. - 10 Dark frames at same exposure/ISO etc - 8 Flat frames at same exposure/ISO etc - The potential of 17 bias frames (only using 8 at my cameras quickest shutter speed. Why would DSS tell me it can only use 1 light frame to stack when I use those calibration frames but be fine when I dont? Any help appreciated as not experienced that before. Thanks Lance
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Managed to get some more colour in the image. Learning the whole processing thing but more luck than judgement at the moment. I will try and get both the colour and the detail/nebulosity when I get a few hours tomorrow. Well... final process below. Think that is about as good as I can get it.
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I just had my first attempt at m42 this evening. The histogram looks like I blew out the image a little bit but it came out ok with a quick bit of processing. I will look for a good tutorial of processing the nebula at the weekend... might get a little bit more out of it before I can try and shoot it again.
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NGC224/M31/Andromeda Galaxy - First DSO Image.
Lancebloke replied to Lancebloke's topic in Imaging - Deep Sky
Thanks! I will be giving it a go without as soon as the moon stops being so bright! I had a quick go of the Pleiades and Orion nebula earlier in the week and were just completely blown out! -
NGC224/M31/Andromeda Galaxy - First DSO Image.
Lancebloke replied to Lancebloke's topic in Imaging - Deep Sky
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NGC224/M31/Andromeda Galaxy - First DSO Image.
Lancebloke replied to Lancebloke's topic in Imaging - Deep Sky
@happy-kat It is part of a hospital so they have to keep the lighting on all night which is unfortunate. @MartinFransson I am going to give the same target a go without the filter next time. Also going to wait for the moon phase to change as that isnt going to help over the next couple of weeks! -
NGC224/M31/Andromeda Galaxy - First DSO Image.
Lancebloke replied to Lancebloke's topic in Imaging - Deep Sky
Hi, My general area is class 5 I think, however my back garden happens to back on to a building that had lots of safety lighting around it. -
NGC224/M31/Andromeda Galaxy - First DSO Image.
Lancebloke replied to Lancebloke's topic in Imaging - Deep Sky
Yes, I had everything else on mains at the time... I just didnt think about the camera. One of many learnings! I am trying to work out PHD2 at the moment for guiding. My graph was all over the place at some points but since I didnt stay with it all the time I dont know if all of the problems were self inflicted (e.g. cable snagging) or something else. -
NGC224/M31/Andromeda Galaxy - First DSO Image.
Lancebloke replied to Lancebloke's topic in Imaging - Deep Sky
@happy-kat I am going to give it a go without a filter next time I get a clear night but it is not great. Below is 20s straight through my DSLR (ignore the tree branch) without that filter. @Tommohawk I used ISO 800 for M31. I had lots of facepalm issues (cable snagged when tracking the sky, camera battery died quickly as it was very cold etc) that resulted in my planned 30 x 180s images turning in to 9. I was going to attempt a bunch of shorter exposures for the core (maybe 30s) and then longer exposures (5 mins) for the rest next time I target Andromeda. No idea how to process that but thought it might help. Lance -
NGC224/M31/Andromeda Galaxy - First DSO Image.
Lancebloke replied to Lancebloke's topic in Imaging - Deep Sky
Hi Olly, Thanks. I attempted to do that. My main problem, aside for inexperience, was that inised a light pollution filter which meant there was a lot less data in the red channel. I would be interested what other people could do with the TIFF file from my stack as deep sky stacked had quite a good preview image after the stack that I cannot seem to recreate!