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Droogie 2001

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Everything posted by Droogie 2001

  1. Yes Darks ISO and exposure times should match. i.e. You may want to take x25 120 second expoures at ISO 800. The colder the better but as mentioned unless you retro fit cooling to your camera (probably a bad idea) then that is you limiting factor. The stacking software in which you feed the Darks into wont care about what DSO or tracking conditions you had. Just be sure you don't mix ISO or exposure times. This is why alot of people use cloudy evenings or day time to create their Dark Libraries. Once you have taken say a bunch of darks at ISO 800 at different exposure times and then a bunch of Darks at ISO1600 at different exposures times then you just reuse them for each DSO. People tend to refresh their darks every 6-12 months to help combat any changes within the camera sensor. Frankly I stuck with mine for a year before redoing any darks. Just make sure you camera is in a darken room or shielded from light if you decide to take them during the day, this will prevent sun light leaking in during longer exposures.
  2. Dark frames are not governed by focus as they are simply imaging, well darkness so you should not have any issues there, ISO and exposures lengths are relevant. Flat frames do rely on the focus as this is largely the point of taking them. When I imaged with a DSLR I would try and take them outside on a cold day. Aside from placing the camera in the fridge (which some people have done) there is not a huge amount you can do about this. This is where regulated cooling on a CCD or CMOS helps.
  3. When I was using a DSLR on my Star 71 I screwed the LP into the focuser tube as in geordie85 image. Now that I am using a CCD with Narrowband imaging I have removed LP filter.
  4. Great result with your new 3nm Astrodon, the Rosette looks stunning even with just a single RAW sub. I have the same camera as you but I elected to go with Chroma's Ha 3nm. Also purchased the Chroma OIII 3nm but managed to only use this the once since purchasing it a couple of months back. Here is a single 25min RAW stretched sub at -30C on my WO Star 71. As I am undersampling this makes my stars look a bit square before I carry out drizzling which brings them back inline. Like you I have only managed to capture a short amount of data (2.5 hours) which I posted on my Flickr page, desperately trying to capture more data before it disappears behind my neighbours roof. I really, really like my G2-8300 despite it being 'old' tech
  5. Go on you know they are worth it!...
  6. I don’t see why note. Apparently, the normal method is to have a block of metal to simulate the weight of a satellite. He owns the company that’s makes his own car so cannot see any issues there and great PR. Who knows if the American Federal Aviation Administration will have something to say about it. Lets hope not!
  7. Agree. I watched Fridays launch and was excited as I was the first time I saw a booster land. Have to pinch myself to take in how amazing it is for them to be able to achieve such a thing. We really are watching history in the making.
  8. Had to post this. Super excited about the Falcon Heavy test this month and a potential launch in January 2018. Finally we get to see a picture of what it looks like for real. Its one impressive piece of kit even if it is looks like three Falcon 9's strapped together, cause that is what it is. If he can then land the three boosters, then that’s a bonus. Elon Musk states that whatever happens good or bad it should be quite a show. Looks like his personal Tesla car is going to be it's first payload. If successful it will be destined to roam the Solar System for millions of years...Bonkers. What ever you think about Musk you have to admire his shear ambition and ability to get things done. Link below with pictures and more info: https://spaceflightnow.com/2017/12/20/spacex-releases-first-pictures-of-falcon-heavy-rocket/
  9. Suffering similar issues with new neighbour recently installing an LED security light that is on 24 hours 7 days a week?! I have been out a few times since this has been installed and I have to say the sky now looks like a washed out grey rather than black or a deep dark blue. I never had dark skies before but this pretty much destroys any sense of darkness. The only saving grace is that the light is just about blocked by my fence though of course stray light and reflections are everywhere. As soon as I get up out of my seat I am dazzled with this thing so no chance of any dark adaption. To be fair I haven’t spoken to the neighbour about it yet as soon as I see them I'll politely ask them if they would consider switching the timer on, fingers crossed... Hope your move gets you sorted.
  10. BTW. Your nature images on your Flickr page are amazing! (so to are the Astro images )The stoat image reminds me of the first wild one I have ever seen when I was staying outside Norwich in Norfolk earlier this year. A wonderful experience.
  11. Not strange at all. Totally agree with you.
  12. I have been a YT subscriber for a while. In fact when I was starting out I used their videos as a means of understanding what equipment is needed and when. Really missed their videos as they are some of the best presented and produced ones out there. Glad they are active again.
  13. I have seen an example of this metal bust at the Science Museum in London. It is very odd when you look at it as you genuinely cannot see any reflected light. It would be fantastic to use it to flock the inside of my telescopes though I think the pricing is quite high. Not to mention any practical issues with using it.
  14. A bit off topic but I use the Photo booths at "Boots (the Chemist)" to print out my images. The images default with a insane amount of auto brightness which I switch off immediately. The quality is pretty good, usually need to tweak the contrast and brightness a little. Once you have the general settings they are usually the same for most of your images. It works out about 50p for a 6x4 and and 79p for a 8x6, some of the Boots shops do larger prints but I take these to my local photography shop. Have always found printers to be costly to run and if you buy cheap you definitely get cheap. Astro images are probably one of the hardest type of picture to print for the reasons you mentioned. Not as convenient as printing from home but saves a fortune! Though of course you cannot print out your documents out on these so I guess a printer is inevitable for you, maybe you could try one as a comparison or indeed seperate option? Mike
  15. Absolutely amazing detail in the image. The star at the bottom must have been a handful, its pushing out alot of light!
  16. A quick 2 hours image of the Horsehead and Flame Nebula. Trying to gather more data but weather seems to be saying otherwise… I can only image this early in the evening before it disappears behind my neighbour’s house so not a great elevation. Scope: William Optics Star 71 Mount: Celestron AVX Camera: Moravian G2-8300 – Mono Filter: Chroma Ha 3nm 5x1500s exposures (2 hours) at -30c Flats & BIAS Processed in PixInsight Thanks for looking.
  17. The objects you mention are rich in Hydrogen Alpha so maybe you could look at an HA filter, it wont give you colour images though. They come in different wavelengths. e.g. 12nm, 7nm. The lower the value the narrower the wavelength of light that it lets through meaning it can help cut out Light pollution. The trade off is that they will require longer exposure times becuase of this. Obviously being a DSLR will reduce its capture capability as it has a built in Bayer matrix (Tiny individual RGB filters on the sensor) Ha also requires longer exposure times again a limitation with DSLR's (heat) but not impossible, I have seen some very impress DSLR images taken in Ha. Back to colour images. Yes the more subs you have the better but 45 seconds sounds way too short so you need to increase this. What ISO are you using, do you have a light pollution filter? I would start at ISO 800 at 3mins and work your way up from there.
  18. Thanks I think you are correct about the filter wheels. I don't intend to change filters often. Having switched to NB recently I don't have any great urge to broadband what with living in a red zone. Let us know what you decide on.
  19. Swapping a single filter takes me about 10mins. This is because I am being extremely careful. Obviously dropping a screw or accidentally touching the filters with a screw driver is to be avoided at all cost. I wear good quality jewellers gloves and take my time. I guess there are other possible configurations. Maybe have an Ha, LRGB so you can add narrowband data to colour images? Not sure on Ha, OIII, RGB combination? Again this doesn't address issue but configurations I have considered. The last possiability would to purchase a 7 pos Moravian FW. I think these can be added the G2-8300?
  20. I have the same CCD camera as you so I am also restricted to 5 filters. Having moved to NB imaging I have added an Ha and OIII and removed one of the Broadband filter (green I think) and left it as that. So I have L,R,B,Ha,OII In effect I have made my Broadband filter non-useable. The reason I left them in is to act as a means of reducing dust entering the camera. For the moment I am enjoying the benefits of NB and currently have no urge to go back to Broadband yet, but will no doubt return to it at some point. In answer to you question using an OAG with an OIII filter maybe possbile but almost certainly not with an Ha filter (though I have not tried this) as it lets hardly any light through, guide stars will be very hard to locate. Focusing the OAG also presented some considerations due to the new NB being thicker than my Broadband filters which meant an adjustment to the focus of the OTA, this has a knock on effect on the OAG focus. The only time I use the LUM filter is to plate solve. This means my plate solving images are slightly out of focus but this does not seem to bother SGP. Most of this you are probably aware of but my other thought with your CCD is to purchase a seperate filter wheel and load these up with the filters. This means just swapping filter wheel instead of fiddly around with indivdual filters. I realise that this does not directly address your question but it is alternative possability. I always knew that being restricted to 5 filters in the CCD would cause this issue, but swapping filters around for me at the moment is my plan. As I say no rush for Broadband imaging for a while.
  21. Is it the gain setting perhaps? I dont know much about the ASI1600. Maybe post this is the Camera discussions?
  22. That is odd. Was the first image done in a single night? Maybe it was the sky conditions or guiding? Still at least you have made some progress on this.
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