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ZWO ASI294 MC pro

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#51 Foobaria

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Posted 28 January 2018 - 01:04 PM

I've taken some narrowband data with the 294, I have an Astronomik 12nm hydrogen alpha filter, and I was easily able to pick up data on M42 and the rosette. Here is the first image I ever took with this camera, it is 150x60s exposures at 350 gain through a Astronomik CLS-CCD Filter (my L-2 Filter had not arrived yet) and 168x60s exposures through my Astronomik 12nm Ha filter at 350 gain. I had not taken good calibration frames for this image, so there are some issues there, but let me know what you think of it! I'm going to be trying to do some imaging at 120s and 120 gain to see if I can get better noise reduction using more exposures, and to see if I can achieve a better result. I also happen to have a Lumicon Galaxy filter, but I've only used it once, but if anyone would like to see what my narrowband data looks like, or if anyone would like to see me image a specific target please let me know as I am always learning. Clear Skies!

These photos look like those nicer photos you see via a Mono cam with filter wheels (which i'm too lazy to go that route) but in a single shot color cam, impressive. 



#52 Steven Hanaway

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Posted 28 January 2018 - 01:49 PM

I know it looks as though the very bright stars are saturating the chip, and in the unstretched image they are not blooming really bad or anything. That being said, at 350 gain, the camera only has a full well depth of something around 1000 e-, and I used alot of exposures at high gain for this image. I am really impressed with what I am able to image with the camera, on astrobin I recently uploaded an image of messier 100, which I imaged with only 58mins of 120s exposures at 350 gain. I would like to re-image the horsehead using 10m exposures at unity gain, but I am working on my goal of imaging the entire messier catalogue, which have almost completed (though most of it I have imaged with my 224 based sensor.) Thank-you for the support! It makes me happy to know that people actually like my images and that I'm on the right path. Clear Skies!



#53 Foobaria

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Posted 28 January 2018 - 02:40 PM

Makes we want to relegate my asi1600mc non-pro to the guide scope and get one of these. 


Edited by Foobaria, 28 January 2018 - 02:40 PM.


#54 AstroBobo

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Posted 29 January 2018 - 12:17 PM

Frankly, all of the images look very noisy to me. I was considering a color camera just so I don't have to do many hours with a mono & filters, but these 4 hour exposures look extremely noisy. Now I'm having doubts even about the new high end full-frame color chips.



#55 mikefulb

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Posted 29 January 2018 - 12:52 PM

I think it works be more useful to have complete datasets to download because honestly processing can severely underrepresent the true potential of a camera.
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#56 CCD-Freak

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Posted 29 January 2018 - 06:05 PM

I think it works be more useful to have complete datasets to download because honestly processing can severely underrepresent the true potential of a camera.

I agree....I would like to see what individual subs look like and I would also like to try processing some images before I run out and buy one of these cameras.   I was looking at the specs and it appears the sweet spot would be a gain of around 120. The read noise would be low and the DR is still good and the Full Well is over 10K.  I would like to see some images shot at that setting.

 

294-Gain-RN-DR-FW-vs-gain2-e1508750996334.jpg

 

I know OSC cameras can do a good job.  This shot of M20 was only 45 minutes with an Atik 838L+

 

M20-Sigms-Cal-Sat-CB-3x3-JL-2-LBL.jpg

 

John

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#57 dvalid

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Posted 30 January 2018 - 02:21 PM

Could someone please provide a single 300 sec dark frame of the ASI294, taken at gain 120?

 

Thanks in advance!


Edited by dvalid, 30 January 2018 - 02:54 PM.

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#58 CCD-Freak

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Posted 30 January 2018 - 02:28 PM

A some light frames at 120 gain would be nice too.

 

John

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#59 rockstarbill

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Posted 30 January 2018 - 07:22 PM

Could someone please provide a single 300 sec dark frame of the ASI294, taken at gain 120?

Thanks in advance!


I can later this evening. What temp?

#60 dvalid

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Posted 30 January 2018 - 07:30 PM

 

Could someone please provide a single 300 sec dark frame of the ASI294, taken at gain 120?

Thanks in advance!


I can later this evening. What temp?

 

At -10C, please. Thank you!



#61 rockstarbill

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Posted 30 January 2018 - 09:41 PM

The file was placed here:

 

https://1drv.ms/f/s!...Q8YXQnxow3qDrzg

 

I am not sure I would use this camera at -10 but that is what you wanted.

 

There is a file with -15 in the name of it. Be sure to look at that one as well.  


Edited by rockstarbill, 30 January 2018 - 09:57 PM.

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#62 CCD-Freak

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Posted 30 January 2018 - 10:38 PM

The darks look pretty good.  Got any image files taken at 120 gain?   

 

John

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#63 rockstarbill

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Posted 30 January 2018 - 11:19 PM

Nope nothing but clouds and rain for the last month+.

#64 dvalid

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Posted 30 January 2018 - 11:23 PM

The file was placed here:

 

https://1drv.ms/f/s!...Q8YXQnxow3qDrzg

 

I am not sure I would use this camera at -10 but that is what you wanted.

 

There is a file with -15 in the name of it. Be sure to look at that one as well.  

Now that's a different story! As expected, they look much cleaner than the dark at gain 0:
 

Gain 0 (RN=7.5e) at the left side, gain=120 (RN,2e) at the right, -10C:

 

Screenshot 2018-01-31 08.07.57.jpg

 

at -15C the unity dark looks even more impressive:

Screenshot 2018-01-31 08.09.25.jpg

 

P.S. I have deleted the previous comparison, it seems something was wrong with the files and results were completely misleading.


Edited by dvalid, 30 January 2018 - 11:35 PM.

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#65 rockstarbill

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Posted 30 January 2018 - 11:32 PM

I wanted to get a -20 dark but I can't cool inside that low.
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#66 dvalid

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Posted 30 January 2018 - 11:45 PM

Nope nothing but clouds and rain for the last month+.

Thank you Bill. It would be very interesting to see your results. Clear Skies!



#67 rockstarbill

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Posted 30 January 2018 - 11:54 PM

You bet. I think I need to move!!

#68 CCD-Freak

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Posted 31 January 2018 - 09:46 AM

 

The file was placed here:

 

https://1drv.ms/f/s!...Q8YXQnxow3qDrzg

 

I am not sure I would use this camera at -10 but that is what you wanted.

 

There is a file with -15 in the name of it. Be sure to look at that one as well.  

Now that's a different story! As expected, they look much cleaner than the dark at gain 0:
 

Gain 0 (RN=7.5e) at the left side, gain=120 (RN,2e) at the right, -10C:

 

attachicon.gif Screenshot 2018-01-31 08.07.57.jpg

 

at -15C the unity dark looks even more impressive:

attachicon.gif Screenshot 2018-01-31 08.09.25.jpg

 

P.S. I have deleted the previous comparison, it seems something was wrong with the files and results were completely misleading.

 

Thanks  dvalid

 

This bears out what I was thinking.  Now I would like to process some image data at 120 gain to see how the noise is.

 

John

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#69 CCD-Freak

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Posted 31 January 2018 - 10:41 AM

And since it was cloudy this evening, I reprocessed the horsehead nebula. I hope ya'll like the reprocessed version, let me know what you think, I think my processing skills have some catching up to do with this camera, it is quite capable! for a high quality version please see my astrobin for this image at: http://astrob.in/full/329732/B/ Clear Skies!

Hi Steve

 

You got lots of data there.  Have you tried imaging at 120 gain as yet?  I would love to try processing some of your data the way I normally do it so I can get a good comparison to my Atik 383L+ OSC.  

 

John

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#70 Steven Hanaway

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Posted 02 February 2018 - 05:23 PM

Good afternoon everyone! So I've uploaded the raw stacked files for Messier 45 using the ten minute exposures from the image above, as well as my stacked data for IC 434 to my astrobin page. I'm going to reprocess the image of the Tadpole Nebula without Ha tonight, so look for that upload here. Link to my astrobin page here: https://www.astrobin...ers/AstroSteve/


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#71 dvalid

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Posted 02 February 2018 - 05:56 PM

Good afternoon everyone! So I've uploaded the raw stacked files for Messier 45 using the ten minute exposures from the image above, as well as my stacked data for IC 434 to my astrobin page. I'm going to reprocess the image of the Tadpole Nebula without Ha tonight, so look for that upload here. Link to my astrobin page here: https://www.astrobin...ers/AstroSteve/

Steven, thank for sharing! Can't find the raw data though :)



#72 Steven Hanaway

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Posted 02 February 2018 - 06:17 PM

Sorry i'm new to cloudy nights and astrobin, here is a link to my google drive with the files, if you post them up anywhere please just credit me for taking the data, Clear Skies! https://drive.google...CqTLASLnEckYb5i


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#73 dvalid

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Posted 02 February 2018 - 08:53 PM

Sorry i'm new to cloudy nights and astrobin, here is a link to my google drive with the files, if you post them up anywhere please just credit me for taking the data, Clear Skies! https://drive.google...CqTLASLnEckYb5i

 

Steven, it's very nice data. Couple of recommendations -

Stars are overexposed, better to use shorter than 10 min exposures. 

You need more integration time, as the images are noisy. Your scope is a bit slow..

You want to better polar align and dither between exposures, since your images suffer from so called "walking"  FPN noise:

Screenshot 2018-02-03 05.32.35.jpg

 

I've briefly processed M45 image. Honestly, could have done better, used too much noise reduction etc, but still:

 

Messier-45-24Jan2018.jpg

 

Just in case, here is the link to the tiff file:

 

https://www.dropbox....8 copy.tif?dl=0

 

David


Edited by dvalid, 02 February 2018 - 09:01 PM.

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#74 Steven Hanaway

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Posted 02 February 2018 - 09:26 PM

Its nice to see someone else process my image. I'm not sure how to get rid of FPN, my polar alignment is spot on, measured using sharpcap and PHD to less than 15 arc seconds. guiding is pretty good as well, as you can see my stars are perfectly round, and the lights don't have much if any overlap. it seems like when I image at unity gain I am getting that FPN, and I'm not sure how to get rid of it :/



#75 Steven Hanaway

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Posted 02 February 2018 - 09:26 PM

Also, I've been thinking about doing just 5 min exposures, to help with the stars being overexposed


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