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#4226 StarMike8SE

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Posted 29 July 2016 - 06:52 AM

I must be a total noob! I have no idea how to process a 5 x 60s stack of images. I can capture an AVI and process that, but i have no idea how to process a set of 60s exposures. How do you do that?

The software that comes with the Infinity does all that for you



#4227 Astrojedi

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Posted 29 July 2016 - 10:52 AM

Given that you use both the infinity and the zwo224mc I'd be interested in your thoughts on their relative sensitivities.
Just wondering if it's worth getting the infinity - for greater sensitivity (and bigger fov).

 

In my experience of using both cameras the 224 is more sensitive than the Infinity Color and can build equivalent or more detail using shorter sub exposures due to the lower read noise (although total exposure time will be similar as they have similar QEs).

 

With the 224 you can get away with 10-15s sub exposures using high gain on almost any object however faint. The Infinity Color requires longer exposures (depending on how faint the object is) to overcome the much higher read noise for fainter objects (read noise is 6x more than 224). I have found that I achieve best results with the Infinity Color using 60s+ exposures which require guiding.

 

What differentiates the Infinity is the software (and FoV). The software has excellent ease of use and needs minimum fiddling - which is important when doing outreach as you want to be talking to people rather than have your head in a laptop.


Edited by Astrojedi, 29 July 2016 - 11:19 AM.

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#4228 Relativist

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Posted 29 July 2016 - 11:01 AM

I would also point out that the infinity does not have adjustable gain. So in terms of raw sensitivity of the sensor and an apples to apples comparison that is not realistic, one needs to look at the whole user experience, as Hiten has pointed out here.

#4229 Astrojedi

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Posted 29 July 2016 - 11:53 AM

Curtis makes a good point. The only thing I would add is that the read noise of the camera limits how much gain you can use. The only reason you can push the gain so high on the 224 is due to the incredibly low read noise.

 

Typically the CCD cameras are optimized by the manufacturer for maximum SNR given the noise characteristics of the sensor and the camera architecture.


Edited by Astrojedi, 29 July 2016 - 06:28 PM.


#4230 DonBoy

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Posted 30 July 2016 - 03:58 PM

The following were taken with the ASI1600MC Cool set to bin 2x2 and were captured at 8 and 10 bits.  C8 @ f6.3ish - Idas LPS-P2 - All were captured while broadcasting on NightSkiesNetwork.com and so stacks may have over accumulated due to conversations ( in other words way more stacks than needed for broadcasting purposes). 

 

NGC6992 - 60s x 11

NGC6992-60s x 11.jpg

 

M103 - 15s x 7

M103-15s x 7.jpg


Edited by DonBoy, 30 July 2016 - 04:11 PM.

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#4231 DonBoy

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Posted 30 July 2016 - 04:02 PM

NGC7023 - 45s x 27 (lots of conversation end up with extra stacks)

NGC7023-45s x 27.jpg

 

NGC40 - 15s x5

NGC40-15s x 5.jpg


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#4232 DonBoy

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Posted 30 July 2016 - 04:03 PM

NGC6995 & IC1340 - 120s x 5

NGC6995&IC1340-120s x 5.jpg


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#4233 DonBoy

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Posted 30 July 2016 - 04:08 PM

IC5146 - 45s x 15

IC5146-45s x 15.jpg


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#4234 Robrj

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Posted 30 July 2016 - 04:41 PM

I got first light on my "new-to-me" AVX mount with the Celestron 130 SLT OTA.   I bought it on Astromart about a week ago.  I took it out the day before yesterday but was having problems getting it aligned.  I've never used an equatorial mount but it was just weird.  Turned out the firmware in the handset was for an ALT/AZ mount (It said "Nexstar Ready" rather than "Advanced VX").  So I reflashed it with the EQ mount the following morning and now everything is working great.  It came with a polar scope on it so I just did an alignment with that for now.  I didn't do the All Star Polar Align.  I did a two star align, with 3 calibration stars.  I set it so that Polaris tracked the circle of the polar scope when I rotated the RA axis.

 

Overall, I'm pretty happy with the AVX.  I did M16 without a filter on the Ultrastar.  For the rest of the Ultrastar pictures, I put an Optolong CLS CCD filter.  The sky was murky at the horizon with a bright orange glow. 

 

The first three were done with the ZWO ASI185MC and the Orion Guidescope riding on the 130 OTA (my e-finder).

M25 - 21x3s 340 gain 

M25 21x3s 340Gain Orion 50mm Gudiescope & ZWO ASI185MC
 
M29 - 169x1s 363 gain (I did this one simultaneously with the Ultrastar-C's M29)
M29 Stack 1sx169 363Gain Orion 50mm Gudiescope & ZWO ASI185MC
 
M39 - 11x1s 363 gain
M39 11x1s 363 Gain Orion 50mm Gudiescope & ZWO ASI185MC
 
 
The following were done with the Ultrastar-C on the Celestron 130 SLT (AVX mount) with an Optolong CLS CCD
M102 - 5x45s
m102 5x45s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M28 12x8s 2x bin
m28.2xbin 12x8s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M26 - 6x45s
M26 6x45s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M21 - 7x10s
M21 7x10s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M18 - 6x10s
M18 6x10s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M15 - 4x30s
M15 4x30s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M17 - 4x45s
M17 4x45s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M20 - 6x45s
M20 6x45s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M29 - 7x5s
M29 7x5s Celestron 130 SLT on an AVX mount  Ultrastar-C w/Astronomik CLS CCD filter
 
M16 - 6x45s
M16 6x45s Celestron 130 SLT on an AVX mount  Ultrastar-C

Edited by Robrj, 30 July 2016 - 04:45 PM.

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#4235 alphatripleplus

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Posted 30 July 2016 - 07:01 PM

IC5146 - 45s x 15

attachicon.gifIC5146-45s x 15.jpg

 

Don,

 

What gain do you use for your 45sec subs? I know with my ASI224 that the subs blow out at high gain (350), so I assume you are using something lower?



#4236 DonBoy

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Posted 30 July 2016 - 07:48 PM

Errol, I set the gain to 400 and set Brightness to 0 and Gamma to 1 or very low for exposures 30 sec or longer.  The rest is managed in the histogram.  You have to take into account the focal ratio, filters, etc.   Setting gain to 400 is not best for imaging but it is helpful when broadcasting to reduce exposure time and since this camera has very low noise it works.  If the moon or LP cause too much sky glow then I reduce exposure.


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#4237 ChrisFC

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Posted 30 July 2016 - 09:03 PM

Got some northern hemisphere objects tonight and the local astro group observing site. Can't get these at home as obstructed by a hill. Plus this site looks like a yellow zone compared to home which is orange.

 

Below dumbell and ring nebulae. GT81 with ASI224MC gain 350, UHC filter, both 16x 12sec. Darks subtracted. Was going for larger sthn objects so working at F3 with Meade FR - so probably not the best for these objects. Captured with sharcap, saved fits and stretched in fitswork.

 

In answer to Donboy. I could never get anywhere near 45sec subs at gain350. Even at 12sec gain350 blows out a bit. I see there's now a cooled version of the 224. Anyone tried it, maybe that would let you push the gain & exposure a bit more ?

Attached Thumbnails

  • RingNeb Meade 15sp_UVI_Stack_16.jpg
  • DumbellNeb Meade 15sp_UHC_Stack_16.jpg

Edited by ChrisFC, 30 July 2016 - 09:15 PM.

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#4238 alphatripleplus

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Posted 30 July 2016 - 09:31 PM

Errol, I set the gain to 400 and set Brightness to 0 and Gamma to 1 or very low for exposures 30 sec or longer.  The rest is managed in the histogram.  You have to take into account the focal ratio, filters, etc.   Setting gain to 400 is not best for imaging but it is helpful when broadcasting to reduce exposure time and since this camera has very low noise it works.  If the moon or LP cause too much sky glow then I reduce exposure.

 

Thanks for the info, Don. I just noticed that you were operating at f/6.3 with a LP filter - as you say that makes a difference compared to operating at below f/4 without a LP filter. So I can see why you are not blowing out at high gain.



#4239 Don Rudny

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Posted 03 August 2016 - 12:18 PM

We had a fun night last night broadcasting on NSN from Mauna Kea at 9200'.  We had first light on a CPC 1100 HD equipped with Hyperstar (560mm FL @ F2.0) and SX Ultrastar C camera.  Most of the images were 15s or less exposures and most were not stacked.  If they are stacked, the info is in the caption.

 

M13 1x5s

image.jpeg

 

M101 7x30s

image.jpeg

 


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#4240 Don Rudny

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Posted 03 August 2016 - 12:20 PM

M16 1x15s

image.jpeg

 

 


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#4241 Don Rudny

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Posted 03 August 2016 - 12:22 PM

M8 1x15s

image.jpeg

 

M17 1x15s

image.jpeg


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#4242 Don Rudny

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Posted 03 August 2016 - 12:25 PM

Cat's Paw Nebula 1x15s

image.jpeg

 

B72 The Snake 1x15s

image.jpeg


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#4243 Don Rudny

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Posted 03 August 2016 - 12:27 PM

B86 Ink Blot 1x15s

image.jpeg

 

M20 Trifid Nebula 1x15s

image.jpeg


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#4244 Don Rudny

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Posted 03 August 2016 - 12:30 PM

Helix Nebula 18x15s

image.jpeg

 

M27 36x5s

image.jpeg


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#4245 CharlesC

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Posted 03 August 2016 - 12:35 PM

Don,  amazing M101 example.  Never seen anyone have to worry about blowout on M101! 

Says alot about Ultrastar sensitivity.  Very distinct Helix, and only 15s on Trifid with great detail!



#4246 Don Rudny

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Posted 03 August 2016 - 12:56 PM

Thanks, Charles.  I was amazed that we were getting decent images with single short exposures.  I tried stacking, but the stacking routine was creating distortion of the star field.  I think there were too many stars.  I'll have to ask Paul about it.  We were really thrilled with the performance of the Hyperstar and C11 Edge.  It's really a great EAA setup.  Not great for portability though.

 

Don



#4247 Astrojedi

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Posted 03 August 2016 - 12:58 PM

Superb captures Don. I can only dream about those dark pristine skies here.


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#4248 StarMike8SE

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Posted 03 August 2016 - 01:12 PM

M8 1x15s

attachicon.gifimage.jpeg

 

M17 1x15s

attachicon.gifimage.jpeg

Shows how good it is using Hyperstar for a single image.  I did compare them to mine.  Mine are not quite as good but close, and I am in a RED zone

swan.jpg lag.jpg

Attached Thumbnails

  • IMG_1303.jpg

Edited by StarMike8SE, 03 August 2016 - 01:13 PM.

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#4249 Don Rudny

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Posted 03 August 2016 - 01:16 PM

Pretty darn good, Mike.  I like the detail you got in the M8 Hourglass.

 

Don


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#4250 StarMike8SE

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Posted 03 August 2016 - 01:16 PM

 

M8 1x15s

attachicon.gifimage.jpeg

 

M17 1x15s

attachicon.gifimage.jpeg

Shows how good it is using Hyperstar for a single image.  I did compare them to mine.  Mine are not quite as good but close, and I am in a RED zone

attachicon.gifswan.jpgattachicon.giflag.jpg

 

But I had to stack for around 5 minutes, not  single image




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