Anyone doing really long exposure times?
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Anyone doing really long exposure times?
Last night, I decided to shoot my current subject at 600 sec and at 900 sec and compare the two in PixInsight. Other than a slightly brighter image, I didn't really see much difference in the fainter regions.
I know this is probably not the way to compare the two images but here's what I did. I opened both in PixInsight, Did a STF on both, copied the STF to HT and then exported each as PNG's. That's what you are looking at in this video. It starts with the full sensor capture and then zooms in on two different regions, one bright and one darker.
Tell me what you think. First, if this is the correct/best way to compare the two images, and second, do you think it's worth it to give up the total # of subs per evening by going longer? Figuring at this time of year I have about 6 hours of good imaging time between the end of Astronomical twilight and the beginning of astronomical dawn. So that's a difference between capturing 36 subs vs 24 subs.
BTW, it's a 4K clip if you have a decent 4K monitor to look at it.
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Re: Anyone doing really long exposure times?
The only reason to take longer subs is to get faint details out of the read noise threshold. If you are finding that you cannot get the faint details to show through the noise, then you might experiment with longer subs. If your faint details are fine, then longer subs just give more opportunities for losing integration time to problems like aircraft, cable snags, etc.
I take 300s subs for luminance, 600s for
I wouldn't use an automatic tool like STF when doing statistical comparisons on subs. STF, at least the way most people use it, uses different stretch parameters on every image. So you will be comparing apples to oranges.
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Re: Anyone doing really long exposure times?
What would be a better way of comparing apples to apples?
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
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Re: Anyone doing really long exposure times?
Yeah, you!
Mine rarely go above 300. As long as there's a gap between the left side of the histogram and the zero of the X axis, I start capturing. Wasted shorter subs due to satellites etc are a smaller proportion of the total.
But I'm still interested in seeing how both your comparison experiment and your 900 second project goes.
Graeme
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Re: Anyone doing really long exposure times?
I think personally the only value in doing longer subs than 600secs is if the target is very very dim, such as perhaps the Squid and such like.
Carole
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Re: Anyone doing really long exposure times?
One way (still not the best) is to use STF on one of the subs and then transfer that value to the other subs. That way the same stretch is applied to all (the stretch from the first sub that is). You can do this by applying the STF to HT and then use HT on the other subs.
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Re: Anyone doing really long exposure times?
Mounts AP1100GTO mount w/APCCpro; iOptron iEQ30 Pro; Criterion Dynamax-8 SCT
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Re: Anyone doing really long exposure times?
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Re: Anyone doing really long exposure times?
51.248N, 113.53W, 995m ASL
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Re: Anyone doing really long exposure times?
Nope, ZWO 6200. Basically the same sensor as my 2600 except full frame instead of APS-C.
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
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Re: Anyone doing really long exposure times?
My two penneth
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Re: Anyone doing really long exposure times?
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Re: Anyone doing really long exposure times?
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Re: Anyone doing really long exposure times?
Yes, I would be afraid to try 30 min with a target like the Horse head, knowing Alnitak is going to blow out.DEnc wrote: ↑Tue Aug 22, 2023 8:25 pm I tried 30min exposures of the Horsehead in Ha, only to see if a) I could pull it off with my Mach 1 mount, and b) do it in a ridiculously light-polluted neighborhood. There were nasty artifacts associated with overexposure of Alnitak, which could be managed with a starless workflow. Six hours total, Stellarvue SV110 and an SBIG STT8300M camera:--
Horsehead.jpg
I instigated this question because of shooting the Flaming Skull Nebula which did not have any bright stars in the
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
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Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
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Re: Anyone doing really long exposure times?
I thought the idea of
I only do 600 on
Carole
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Re: Anyone doing really long exposure times?
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