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Found 14 results

  1. The Sun today - 07 May 2019 0130UT (1130 AEST) Lunt LS60THa single frame exposures with an ASI 1600MM AR2740 with AR2741 just coming around the limb This last one using a Televue 2.5x Powermate cheers Dave
  2. Hi all, I'm a newbie to mono imaging and am having trouble with circular/ring shapes in my subs. The circles are particularly pronounced after stacking my Lum subs but also appear in blue stacks. At the moment, this is making my lum subs unusable and I'm only just managing to put together RGB images. I'm using an ZWO ASI1600mm with ZWO filter wheel and filters (36mm unmounted). The attached TIF (LumStack.TIF) is 10x150sec of Lum subs stacked in DSS. The circles aren't very pronounced at this stage but after DBE and STF (see second SunflowerLum.jpg) the circles are very clear to see. I've also attached a stack of Lum data on Bode's galaxy which shows the same issue. Does anyone have any ideas what could be causing these? Thanks in advance LumStack.TIF
  3. Learning case: My last nightly deep sky imaging sessions did not give good results. Also the dark's were brighter on one side. Changing a USB3.0 cable did solve the problem temporarily. However, it came back and I was about to blame and return my 1/2 year old imaging camera. Strange enough, the effect was depending on the telescope position and ultimately I found it was caused by infrared light leakage due to the imaging camera coupling. The infrared came from the surveillance camera I use to monitor the setup. My recording camera is the very sensitive ASI1600MM-Cool. This camera is also sensitive to infrared. The IR / UV blocking filter is placed in the filter wheel. The camera coupling let enough infrared light through to disturb the imaging. The surveillance camera has been placed approximately 1m5 from the setup and has been in operation for a month. After all, trivial but you expect a coupling to be sufficiently light tight. The effect was also strongly depending on the telescope orientation. In infra red the arrangement was illuminated, although for the human eye's the surveillance camera LED's barely lighted. Due to it I lost two clear nights. In addition, I also noticed that 2 "black plastic covers are for infrared permeable, otherwise I'd have located the problem much earlier. Looks like they require additional aluminum foil cover to be light tight for the ASI1600 Han The surveillance camera: Imaging camera and point of leakage:
  4. Guest

    ASI1600MM first image

    Someone mentioned in one of the other forums that with the arrival of the ASI1600MM we would see a bunch of mediocre initial attempts with this new camera - and here is my first installment LOL Another member mentioned that images processed in Pixinsight often looked like the object was cut out and pasted to a generic starfield....again....my contribution is cut and pasted in Pixinsight - a program I'm learning to use and due to its complexity I will be forever learning :-) Here's the North America Nebula from Welford Observatory in the UK on the 26th of August, 2016 It consists of 10x60sec subs per channel, captured with a TS65 quad and guided with an ASI120MC and of course the camera was an ASI1600MM Cool So think about it - 60 second subs (could be 30 seconds) and only 40 minutes of capture time - and the result is better than my OSC ever was...and I was worried about going to LRGB because i'd never have time to capture all the channels LOL ....not no more :-) Some notes here on my blog
  5. Guest

    M31 with ASI1600MM

    This image was captured with an ASI1600MM (Lx179@60and30s_RGBx20ea@60) It clearly needs more data but it was fun comparing this to the results I got with my OSC camera (QHY8) There isn't a huge difference - but there will be when I add Ha to this :-) Zoom in and you'll see black flecks across the image - not sure what's going on there as it appears on all subs (processed Flat/Bias - no need for darks - tested that) David
  6. Guest

    ASI 1600 First Light

    I received an ASI1600MM from FLO this week and they somehow managed to sneak some clear skies into the box with it :-) I've been alarmed at how easy it was to get this camera running, the new config on guiding (via the mini hub in the camera) working and guiding and how well EQMOD and stellariumscope are behaving.... hmmmmm, clear skies, equipment working......what could possibly go wrong? I'll tell you tomorrow in the imaging section :-) David
  7. The Sun in Ha 21 Apr 2018 Absolutely crap seeing conditions... even the "blue" parts of the sky between the cloud gaps had a high haze. Nice new active region (AR2706) with spots and a nice prominence showing a large detached section Lunt LS60THa, ASI 1600MM camera and Sharpcap capture software Full Disk AR2706 Prominences and nice large detached section (haven't seen one that well detached before) Dave
  8. Been a couple of weeks since I last got a chance to do some solar observing/imaging some Ha images from today. One very large prominence and some filaments .... Lunt LS60THa and a ASI1600MM camera, Sharpcap software and some editing in LR Dave
  9. This imaging session, occurring over 2 nights was not without its mistakes and confusion! Setting up the first night I seemed to spend most my time trying to remember how to configure the capture software correctly. The second night I decided not to connect the guide camera to the PhD Guiding 2 correctly and spent 30 minutes establishing that fact. However, out of the jaws of chaos (which extended to the processing of the image) came one of my better efforts on this object. It’s also the largest amount of data I’ve collected with almost 5hrs going into the can for processing. Details Object name Andromeda Galaxy Object ID M31 Date(s) 11 and 12 October, 2017 Telescope Altair 115mm Camera ASI1600MM Luminance 89 x 2 min = 178 min or 2.96 hrs Red 16 x 2 min = 32 min Green 21 x 2 min = 42 min Blue 19 x 2 min = 38 min Ha 0 Oiii 0 Sii 0 Total time 4.8 hrs Frames 0 Processing PixInsight / Bias, Flats, Darks / Masked Stretch / Curves / ATWT I’m having fun zooming in to the different parts of the galaxy to view the H2 regions (star forming) that I was quite surprised to have caught in such numbers. These regions, swimming amongst the sea of big, hot blue stars destined to burn out quickly, are similar to our own Orion Nebula. Moving to the core of the galaxy and it super massive black hole the cooler, longer lived red stars dominate. Up to the left M110, another galaxy bound to Andromeda has resolved quite well – it can off look very pixelated – and nearby the big blue star who’s name I cannot find This galaxy is 220,000 light years across and contains a trillion stars which is twice as many as in our Milky Way galaxy. I think I now need a lot more colour data for this but its a start. David
  10. Hey guys I started this zwo 1600 problem topic yesterday, but I couldn't get the answer. I have found that my problem is temperature related. when the sensor chamber drops below zero the download hangs. Sorry for the new topic but i am getting really tired of this. Could you please help me out?
  11. Hi again! I posted a query about flats a while back, but have now run into a more specific issue so starting a new thread for this. I had a decent clear night couple of days back and a chance to give the ASI1600 a bit more informed testing. Still finding some oddities with flats generally though, so hoping for some further thoughts please. In the past when doing flats with the DSLR, I've pointed the scope at an evenly illuminated area of the ceiling and run off a number of exposures sort of mid-gray middling histo no problems - always worked very nicely. With the ASI1600MM a couple of oddities though. First, opinions seem to vary on what gain to use - some say a low gain, some say the same gain as the lights. Same gain as the lights seems sensible, so thats what I went with. But with quite high gain (300 in this case) the flats only need very short exposures. This seems to cause horizontal banding, possibly due to flickering in the source light, and if I cover the scope (T shirt method) to reduce the light and extend the exposure to say 60 seconds, same as the lights, I get a lot of noise - I guess this is shot noise. So I settled for just doing lots of flats and hoping the noise would even out - I settled for 100 - though subsequently I see some folk use more, maybe for this very reason. Superficially the master flat looks OK, but at high mag it still looks noisy. See below and magnified section 300%. So what is the solution? Even more flats? Or maybe reduce the gain - all I need is the flat to replicate the vignetting. The mid gray/mid-histo used for flats isnt really the same light level as used in the lights anyway, so does the gain matter? With the DSLR I always set the ISO to 100 for flats and that worked just fine. Grateful as ever for any thoughts and advice!
  12. Hi guys well the ZWO ASI 1600MM finally arrived ( after the postal system sat on it for 3 days ) I did some comparisons between it and my ZWO ASI 178MC that had been the main solar cam up till today both using my Lunt LS60THa and a B1200 (12mm) blocking filter these first two are unprocessed ( SOOC ) , just resized for the forum and ALL images are single frame only ( no stacking) firstly ... the ASI 178MC using mono mode in SharpCap Now the ASI 1600MM NOTE:, tho the image from the 178MC looks more detailed. Strong brightness variation can be seen across the image compared to the 1600MM What I discovered in processing was that the 1600MM image processed so much better and resulted in a significant increase in finer details ASI178 processed ... ASI1600 processed .... There isn't really any comparison between the two ..... the ASI1600 shows much better detail. Specially seen around the Active Region Next post .... prominences Dave
  13. hi guys All my lunar imaging has usually been done with DSLR camera and telephoto lenses, usually the Canon 100-400mm and a x2 teleconverter Last nite I finally fired up the new scope and did some imaging Skywatcher 120mm x 1000mm fl EVOSTAR Black Diamond The mount is a HEQ5 PRO so for the first lunar image through that scope with a ASI1600MM camera and Sharpcap capture software Dave
  14. Guest

    NGC 7635 Bubble Nebula

    Here's my attempt at the Bubble Nebula - wide field Link to Astrobin for full resolution: http://www.astrobin.com/users/David_L/ Scope: TS65; Camera: ASI1600MM; L=140x60s RGB=20x60s; Gain: 139; Offset 10; Bias/Flat/No darks; Processed in: PI I'd really appreciate a critique of this as I'm new to LRGB processing and so not sure I'm getting it right - is this roughly what the object should look like? For instance - in the L channel there appears to be a lot of faint nebulosity that I bring out - but when I do and then combine it with the RGB it gives a very "washed out" feel to the background - as if its overexposed David
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