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M 81
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KHursh
I know this is an oft-imaged galaxy, but it is one of the first images I am proud of.
Image processing is challenging, but capture is a breeze with the Mach2. Sky-watcher 120 with ASI294MM, https://astrob.in/kxm7yk/0/ Kevin
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Roland Christen
Not bad at all. I always say "If it's up, image it!"
Rolando
-----Original Message-----
From: KHursh via groups.io <khursh@...> To: main@ap-gto.groups.io Sent: Sat, Apr 17, 2021 9:54 pm Subject: [ap-gto] M 81 I know this is an oft-imaged galaxy, but it is one of the first images I am proud of.
Image processing is challenging, but capture is a breeze with the Mach2. Sky-watcher 120 with ASI294MM, https://astrob.in/kxm7yk/0/ Kevin -- Roland Christen Astro-Physics
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KHursh
Thanks Unc Rolando
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Nicely done! That first good image is always a special one. Print it; frame it; and hang it on your astro-trophy wall!
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Jeff B
Yes, very nice. Was the optic the doublet or triplet? Jeff
On Mon, Apr 19, 2021 at 9:46 AM Howard Hedlund <howard@...> wrote: Nicely done! That first good image is always a special one. Print it; frame it; and hang it on your astro-trophy wall!
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KHursh
Thanks Howard
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KHursh
Thanks Jeff. It was the Esprit 120, which is a triplet
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Jeff B
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Nice job Kevin! Other than the short exposures, did you have to do anything special in PI to avoid blowing out the core? I've been thinking about getting one of those cameras... Steve
I know this is an oft-imaged galaxy, but it is one of the first images I am proud of.
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KHursh
Yeah, that is my rule of thumb with CMOS. Short exposures. Thanks for the kind words
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I have an ASI-1600MC Pro on a TMB130SS f/7 APO on an AP1200. I usually shoot 10m subs. For galaxies I often use Pixinsight's HDRMultiscaleTransformation to recover core detail. Here is my attempt at M81 and M82: http://astronomy.mdodd.com/galaxies-18.html
It's easy to get carried away with HDR. I've attached a screen shot of M81 where I went way too far. CS, Mike 380x383
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I think Kevin's approach is correct for CMOS. I have the 1600MM Pro and there just doesn't seem to be an advantage to long subs, although I've only done one galaxy and it was faint. The integration recovers the low end and the high end has less saturation. Kevin's 294MM has much greater full well depth than the 1600 as well as 14 vs 12 bits. There were some minor sensor issues but I'm getting one when they are fixed. Steve
On Tue, Apr 20, 2021 at 10:11 PM Mike Dodd <mike@...> wrote: I have an ASI-1600MC Pro on a TMB130SS f/7 APO on an AP1200. I usually shoot 10m subs. For galaxies I often use Pixinsight's HDRMultiscaleTransformation to recover core detail. Here is my attempt at M81 and M82: http://astronomy.mdodd.com/galaxies-18.html
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