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ASI 294 results..

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#51 atacamastar

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Posted 17 November 2017 - 02:26 PM

This is another IC434(HH).. DONE in ALT/AZ..at80edtF4.8..  30 sec exp. stack of 51...all done in Sharpcap..orion imaging filter..

and data file.....done from Tampa....ASI294....eazy/peazy.. ALT/AZ

DANG! That is a heckuva capture AND camera !  Can your ASI1600MC do that?  VERY interested to see a comparison image -- 



#52 mega256

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Posted 17 November 2017 - 03:18 PM

Yes you can the 1600 is a very nice camera,,but I'm doing  very short fast hi gain exposures in alt/az...

the 294 is much better at this..I did find out in my HA experements the the 294 get higher bit depth faster than the 1600

and the 294 has bigger well depth (dosn't saturate as fast)

In this example I used the same HA filter on the 1600 as I did on the 294..(images above post)..

I could get more data faster with the 294 with both in high gains..

I'm sure you can get better results with the 1600...but I tried to match gain and time as the 294 test.

HH asi1600 HA  60sec test bin1 gain 575

Attached Thumbnails

  • IC434 BIN 1 42 MIN.JPG

Edited by mega256, 17 November 2017 - 03:21 PM.


#53 mega256

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Posted 17 November 2017 - 03:28 PM

ASI1600color cooled -full frame HH..in HA .60 sec x28  Bin1  8bit mono

Attached Thumbnails

  • HH-1600-HA_28frames_1680s (Large).jpg

Edited by mega256, 18 November 2017 - 10:04 AM.


#54 Hubert

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Posted 17 November 2017 - 04:41 PM

Hi Mega256, I like your pictures but I always see some circles in your pictures?  Do you know what that is? Are they from your Alt/AZ movement?



#55 mega256

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Posted 17 November 2017 - 08:05 PM

Yes they are from long...stacks In alt/az   seams that about 12 min I don't get them...and longer I do...I think it is   from the field rotation and correcting that...a software thing...any software that corrects for field .

 

rotation..lol

 

I could adjust the pic some to minimize it...or use lower gain maybe.

 

But I'm just glad to do this at all....


Edited by mega256, 18 November 2017 - 10:05 AM.

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#56 Quaternion

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Posted 18 November 2017 - 07:38 AM

Awesome photos.  I have only done some planetary imaging with a 10in DOB on a homemade EQ Platform.  I’m still working on learning to polar align, but so far the longest exposure I can get without star trails is about 2sec. While I’m hoping to get that up to 5sec with my 10in F5.4 homemade EQ setup, I  probably won’t get much longer than that. Could I use the ASI294 with Sharpcap approach and just stack 10x more frames than you, or would it not have enough stars / data to align on the fly? My fall back is to use Firecapture and a post processing Autostakkert planetary imaging approach, with thousands of images.

 

I’ve also thought of trying the ASI1600MM mono route, but I don’t know if I’m ready to add filter wheels and LRGB complication to my life, especially with my non ideal DSO scope and platform.

 

I’ve tried using my ASI224MC in this manner, but it’s small FOV makes things very tough to find and hold long enough to image.

 

Thanks for any guidance you can give me as I start my journey from the Planets to DSOs.



#57 mega256

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Posted 18 November 2017 - 10:03 AM

I think the 224 is sensitive enough to do it...you may want to try a focal reducer in your setup first.. If you need to go to a 4/3" sensor, then the 294 is one of the most sensitive...

But I would try a focal reducer first on your setup...If you can get the reducer to work with your optics..the fov will be better  and the speed faster (exp time less ) .I would try one of the 2" .5x

or .63 reducers. I would try that first..changing to a larger sensor,,,brings many optic chalanges.


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#58 Robrj

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Posted 18 November 2017 - 10:12 AM

I’ve tried using my ASI224MC in this manner, but it’s small FOV makes things very tough to find and hold long enough to image.
 
Thanks for any guidance you can give me as I start my journey from the Planets to DSOs.

One thing you could try is to pick up an Orion 50mm Guidescope (https://www.telescop...0UaArxmEALw_wcB). Also get a parfocal ring to put on the 224's nose cone and set it so it brings the camera to focus in your finderscope. That will allow you to quickly focus the finderscope as it will be close when you put it in.  Use the finderscope as a wide electronic finder scope. When you get in the area, remove it and put it in the dob. Use the Dob's 2" focuser so the parfocal ring will just slip inside (The ASI224MC will fit using it's outer lip).


Edited by Robrj, 18 November 2017 - 10:14 AM.


#59 A. Viegas

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Posted 18 November 2017 - 02:04 PM

AT65 EDQ + 294pro at -30c    5 x 180s   no darks.  Histogram stretch only

 

This camera matches nicely with the AT65 quad refractor.    I used a low gain, as I was using 125 gain as I wanted a bigger well depth...  Oh I used a 1.25" Lumicon deepsky filter with this so there was some vignetting which I cropped out in this image.  No darks or any other kind of calibration frames were used.

 

 

Al

 

rosette 294 at65 5x180

Edited by A. Viegas, 18 November 2017 - 02:16 PM.

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#60 DSO_Viewer

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Posted 18 November 2017 - 10:42 PM

AT65 EDQ + 294pro at -30c    5 x 180s   no darks.  Histogram stretch only

 

This camera matches nicely with the AT65 quad refractor.    I used a low gain, as I was using 125 gain as I wanted a bigger well depth...  Oh I used a 1.25" Lumicon deepsky filter with this so there was some vignetting which I cropped out in this image.  No darks or any other kind of calibration frames were used.

 

 

Al

 

That is a good idea of what to expect at low gain and a smaller (no focal ratio provided) scope. I am though surprised by the no star color results esp. with using a much lower gain and the large well depth capacity?

 

Steve



#61 Astrojedi

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Posted 18 November 2017 - 10:56 PM

The AT65 is a F6 scope with field flattener built in. 



#62 DSO_Viewer

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Posted 18 November 2017 - 11:43 PM

The AT65 is a F6 scope with field flattener built in. 

Okay thanks Astrojedi. I am surprised though to see no star colors but nebulosity is quite good at the low gain and slower FR.

 

Steve



#63 A. Viegas

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Posted 19 November 2017 - 08:59 AM

Hi Steve

Hmmm  yea  not sure why the star color was not that great in that one.  Same night I also shot this IC405 nebula with the AT65 and ASI294 pro  also using same DS filter.  here the star colors are a little better.   This was 30x180s at gain 125.   

 

ic405 294 at65

Edited by A. Viegas, 19 November 2017 - 09:00 AM.

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#64 Astrojedi

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Posted 19 November 2017 - 11:16 AM

Some shots with the ASI294MC from last evening. Had a really fun observing session.

 

All captures using AT60ED @ F6 w/ field flattener, ASI294MC Pro, Astronomik CLS filter and SharpCap Pro v3. All captures are stacks of 30s exposures at a high gain of 450. I dislike guiding hence prefer to use shorter exposures at high gain. Also improves SNR.

 

First up CA nebula. There were still some scattered clouds when I observed this one. But this is the first time I have imaged this without a H-alpha filter from my red/white zone light polluted skies.

 

CA Neb 20x30s.jpg


Edited by Astrojedi, 19 November 2017 - 11:21 AM.

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#65 Astrojedi

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Posted 19 November 2017 - 11:20 AM

Heart Nebula: 25x30s

 

This is a really difficult nebula from my red/white zone skies and I have never had much success capturing the fainter parts without a HA filter. But I was pleasantly surprise by the results.

 

Heart Stack_25x30s.jpg


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#66 Astrojedi

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Posted 19 November 2017 - 11:23 AM

Here is the SharpCap screenshot of the Heart. Note that I have "unpinned" the menus to maximize screen real estate.

 

Heart Screenshot_3.jpg


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#67 Astrojedi

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Posted 19 November 2017 - 11:26 AM

Here is the horsehead 13x30s

 

Horsehead Stack13x30s.jpg

 

 


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#68 Astrojedi

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Posted 19 November 2017 - 11:28 AM

And here is a screenshot for the Horsehead 10x30s

 

Horsehead screenshot 10x30s.jpg


Edited by Astrojedi, 19 November 2017 - 11:42 AM.

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#69 Astrojedi

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Posted 19 November 2017 - 11:31 AM

Here is a single 30s exposure for reference. I have not set the black point appropriately but you can see how much signal there is in one exposure.

 

Horsehead screenshot 30s.jpg

 

 

 


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#70 Astrojedi

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Posted 19 November 2017 - 11:38 AM

M45 20x30s

 

M45 Stack20x30s.jpg

 

 


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#71 Astrojedi

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Posted 19 November 2017 - 11:41 AM

Here is a screenshot of M45 at 7x30s.

 

M45 Screenshot 2.jpg

 

 

 

 


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#72 Astrojedi

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Posted 19 November 2017 - 11:44 AM

M31 Andromeda 9x30s

 

M31 Stack_9frames_270s.jpg


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#73 Astrojedi

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Posted 19 November 2017 - 11:48 AM

Monkey Head Nebula 7x30s (cropped)

 

Monkey Head N2174 Stack_7frames_210s.jpg


Edited by Astrojedi, 19 November 2017 - 11:48 AM.

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#74 Art_NW AZ

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Posted 19 November 2017 - 12:17 PM

Some shots with the ASI294MC from last evening. Had a really fun observing session.

 

All captures using AT60ED @ F6 w/ field flattener, ASI294MC Pro, Astronomik CLS filter and SharpCap Pro v3. All captures are stacks of 30s exposures at a high gain of 450. I dislike guiding hence prefer to use shorter exposures at high gain. Also improves SNR.

 

First up CA nebula. There were still some scattered clouds when I observed this one. But this is the first time I have imaged this without a H-alpha filter from my red/white zone light polluted skies.

 

 

Hiten,

 

Your ASI294MC images are very impressive. Are you able to use this high megapixel camera via SharpCap Pro v3, and your scope, etc., over your computestick setup? Have you tried SharpCap Pro 3.1 with the computestick?

 

Thanks, Art 


Edited by Art_NW AZ, 19 November 2017 - 12:32 PM.


#75 Astrojedi

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Posted 19 November 2017 - 12:42 PM

Art,

Thanks. Yes, I am using SharpCap v3 on the compute stick. But the Compute Stick seems to struggle a bit at the camera's full resolution with my other applications running e.g. Stellarium, web browser etc... i.e. everything slows down over the RDP connection. So I usually x2 bin. 

 

The Compute stick's design is targeted at embedded style application hence by definition it is a constrained environment. Works well for most cameras but the 294 is just too much for it at full resolution.

 

SharpCap is pretty efficient in terms of resources so I think even a netbook should be able to comfortably handle full resolution stacking. You don't need too much computation.

 

Hiten


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