MarsG76
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Everything posted by MarsG76
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definitely a lens flare, possibly caused by something semi transparent on the lens?... one thing for sure is that it's not Venus.
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Definitely... sometimes I use Photogene⁴ on an iPad to tweak photos and it seems to do a great job with a fraction of the effort required with photoshop .
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Nice Moon.. Who needs PixInsight when there are iPads?
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Calibration frames for LRGB and Narrowband
MarsG76 replied to Hughsie's topic in Getting Started With Imaging
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Precisely.... I also find observing a DSO or planets with my eyes very rewarding, something special about seeing it in reality over a long exposure photo, even if the photo shows vastly more matter and detail.... Both observational and Imaging have their place in the hobby.
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I guess the whole scene animated where every feature and detail is visible correctly "exposed" will have to remain in my memory since thats how I saw it in the eyepiece.... great memory.
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I was thinking exactly the same thing, hence why I captured the exact same occultation area of the moon after the event was over and tried to superimpose the video as you said but because of the fluctuation in the atmosphere it looked like it was super imposed, Saturn and the moon were literally moving independently of each other and it looked faked very faked... so I decided that the original video was the best to keep.. who knows, perhaps I'll find some software that will allow me to match the two perfectly but for now I just settled for replacing the overexposed moon in the occultation frame grabs.
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That looks awesome..... great result, even if its not finished yet.... If the Gallilean moons were round instead of just point, than you must have had some awesome seeing.. I remember those nights.. rare here but when they happen, wow.
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Good luck with the project....
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The noise is an unfortunate side effect of DSLRs with Narrowband filters.... thats is why I cooled my 40D.. the other reason I use a 40D for my astrophotography is because it's only 10Megpix, and has big pixels, resulting in very good noise control....the higher megapixel cameras have smaller pixels and much higher noise.. I found this to be the case with using my 7D comparing to 40D.... Once I cooled my 40D, the Halpha subs are near noise free until I go over the 15 minute subs length mark.. even than its very minimal... last time I imaged narrowband my 15 min subs had only sporadic noise pixels here and there but the 40D sensor was running at 4-5 degrees C. The trick is to dither your subs and capture many subs... and before stacking your subs, run them all through a single pixel removal in a program like PS or Gimp. Dithering will regain some resolution, negate the mottle and cancel out the remaining noise.
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Imagine the results with more data and calibration frames..
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Nebula complex in Sagittarius.
MarsG76 replied to Adry's topic in Imaging Challenge #27 - DSLR / Mirrorless (Now Closed)
Complex alright.... count them stars, that'll be complexity at its maximum.... it's crazy just how many stars are out there...- 1 reply
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Excellent work.. as you know I'm a firm believer in "theres no such things as too much data"...
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Bortle 8?? Very nice.... you must have needed sunglasses in that bright sky.
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Hello Astronomers, On the 12th August, between 18:34 and 19:21 we had a occultation of Saturn by the moon. Of course I couldn't miss out of such a event so I took the day of work and setup my gear so that I could simultaneously capture the event as well as observe it. I had the SCT recording with the 618C while observing it in the dob... literally at high power it looked like a Saturn rise... massive lunar horizon filling the field of view with a big Saturn rising from under it, literally animated and visible slowly moving up... Looked amazing in the eyepiece... Photos or videos don't even come close to how good that looks live in the ep. I had my eye on the eyepiece in the 14" Skywatcher during the occultation and recorded the start and finish times as soon as I noticed them: Occultation Start 18:35.51 AEST Reappearance Start: 19:19.37 AEST Occultation Finish: 19:21.20 AEST I stuffed up the first part video, the covering of Saturn because I still had iCap set to capturing a maximum of 5000 frames left from my planetary imaging, so at 25fps I barely got a 3.5 minute video that stopped just before the actual occultation started... yes I was kicking my self... but at least I watched it... I wasn't going to do the same mistake on the re appearance on the other side... Sharing with you my photos and the video of the event... video is sped up to 400%. Clear Skies. MG Saturn Lunar Occultation 12Aug2019.mov
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I see the resemblance.... natural color is much faster to image...
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In that case, yeah, no need, you should be fine.
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Thats over a day... but like I said, it's autoguided so time spent doesn't matter... the end result counts... I did spend over 56 hours on the Fighting dragons in Ara.. so the times can get quite high very easily. I like to collect the extra subs simply for the SNR factor.
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I wonder just how much quicker you'll be able to capture the equivalent with the 071... and whether 15sec subs will give you any of the deep nebulosity generally picked up by narrowband long exposure... The 3m FL guiding will need to be guided via a OAG, for sure... but a good mount is essential, so if you are willing to spend the 3K on the CEM120, I'd say do it.. I feel like my CGEM is basically at its limit with 2m FL... than again who knows.. I'm constantly getting round stars even at the FL.
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Total exposure time was 27 hours. HAlpha Subs are 10 & 15 minutes long, OIII subs are 15 & 20 minutes and SII subs are all 30 minutes so I had to spend at least 2 whole nights per filter, except in the case of SII which was 3 nights. The SII data is very good... much better now that I'm cooling the 40D than what I had in the past. All subs are ISO1600 and the active cooling definitely helps with the noise levels, most noticeable with SII when comparing to my SII 1800 second subs captured in the past.
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Thats what the general consensus is, but the more I push against the flow, the better my 40D seems to perform... I think that cooling it is giving me a significant benefit because the subs were gathered at 4-5 degrees C where without cooling the length of exposure required for SII, being 1800s, normally heated the sensor to around 35 degrees.... and I never had as much signal in SII after stacking as I had now. My original plan was to use my old 40D, than mod it and than upgrade to a mono CCD, but I'm still more than happy with my results from the 40D so I just keep on putting the CCD plan on hold... yes a mono CCD would shorten the sub length necessity but It doesn't matter since I have a permanent setup and literally adding subs night to night takes me about 10 minutes to resume the imaging... and would a CCD make that much difference with a 8" scope imaged at F10 or F6.3?
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That is a fantastic looking image.... well done... only 2.5 hours is astonishingly short for so much depth.
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Hello Astronomers, Adding my latest image to the comp. This is the Swan (or Omega) nebula imaged during multiple nights between 28 July - 8 August 2019 with my Canon 40D DSLR through my 8" SCT at F10, 2032mm focal length. Imaged in narrowband through Baader SII, HAlpha and OIII filters and combined as SHO (Hubble Palette) colour. Total exposure time was 27 hours. HAlpha Subs are 10 & 15 minutes long, OIII subs are 15 & 20 minutes and SII subs are all 30 minutes so I had to spend at least 2 whole nights per filter, except in the case of SII which was 3 nights. The amount of time it took to gather the subs wasn't crucial since I have a permanent setup and resuming exposures night to night took about 10 minutes, and I wanted as many subs as possible to keep the noise level to a minimum, and to be honest I could just keep on adding subs for as many nights as M17 was in the sky on moonless nights but I find that more than 40 subs per channel on brighter objects seems to have diminishing returns. Gathering more and more subs is made it easy when we're in a drought and there are hardly any clouds in the sky, mostly dry and cloud-free nights lately, which allowed me to have 100% successfully exposed subs. All subs are ISO1600 and the active cooling definitely helps with the noise levels, most noticeable with SII when comparing to my SII 1800 second subs captured in the past. Clear skies, MG
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Hello all, Sharing with you my finished image of the Swan nebula imaged through SII, HII and OIII narrowband filter using my modded and cooled Canon 40D. Imagd trough my C8" SCT at 2032mm focal length. Total exposure was 27 hours across multiple nights. Clear Skies, MG
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That looks great... good work....
