ZWOASI120MM and Too Much Light

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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Starry Jack
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ZWOASI120MM and Too Much Light

Post by Starry Jack » Mon Apr 13, 2015 3:51 pm

I borrowed a friend's ZWOASI120MM to test for my PST100 Stage One mod. The image was completely blownout. So I turned gain off, kept exposures in the lowest bracket available for each channel and made sure the Histogram kept at about 75% or less for each channel. The image was still blown out (zero detail). I also manipulated the brightness settings to no avail.

Finally I added a Baader ND25 filter (so only 25% of the light could come into the camera) and at last got a picture. However, as soon as I increased the exposure much at all the image rapidly overloaded again.

I also tried Auto Exposure.

I am using FireCapture. Do you have any suggestions for a setting I am missing?

Thanks,
Jack

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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Mon Apr 13, 2015 3:57 pm

Here is the FireCapture Log as one example. Keep in mind this is my first use of this software:

FireCapture v2.3 (beta 15) Settings
------------------------------------
Camera=ZWO ASI120MM
Filter=CH4
Profile=Sun
Filename=Sun_153748.avi
Date=120415
Start=153748
Mid=153754
End=153800
Duration=12s
Frames captured=128
File type=AVI
Extended AVI mode=true
Compressed AVI=false
Binning=no
ROI=1280x960
FPS (during start of capture)=10
Shutter=34.45ms
Gain=0
USBTraffic=90
Gamma=65
Brightness=16
AutoExposure=off
Histogramm(min)=82
Histogramm(max)=174
Histogramm=68%
Noise(avg.deviation)=6.95
Limit=600 Frames
Sensor temperature=40.0 °C / 104.0 °F
Attachments
2015-04-13_8-55-50.png

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swisswalter
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Re: ZWOASI120MM and Too Much Light

Post by swisswalter » Mon Apr 13, 2015 4:36 pm

Hi Jack

in my opinion way to much exposed. You did run it at 34 ms, go down to maybe 5 ms or even less
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Mon Apr 13, 2015 4:39 pm

Thank you!
I was at 5ms and even less without the ND25 filter and it was still overexposed. The only way I could get any image at all was to add the filter.

Something is definitely funny...

Jack

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Re: ZWOASI120MM and Too Much Light

Post by marktownley » Mon Apr 13, 2015 8:05 pm

What ERF are you using?
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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Tue Apr 14, 2015 4:51 am

I have the Lunt 100mm for the ERF.

I tried again today without the ND25 filter and no matter what settings I used for every channel, exposure, brightness, gain off...I could not get any detail. I am away from my computer so I cannot post the log from FireCapture until I get home Wednesday. You wil see that in that log exposures varied but we're all under 5ms, gain was off and gamma at about 50. I kept every channels histogram at about 75.

Thanks
Jack

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Re: ZWOASI120MM and Too Much Light

Post by GuillermoBarrancos » Tue Apr 14, 2015 8:53 am

I have the QHY5L-II (same sensor, just that I have color and you mono).

I use a gain of around 90-110, exposure between 18ms-28ms and gamma between 0 and 50 for surface and gamma between 120-150 for Prominences on the limb.

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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Tue Apr 14, 2015 3:15 pm

Thank you for your settings. I will put them into play tomorrow.

Jack

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Re: ZWOASI120MM and Too Much Light

Post by marktownley » Tue Apr 14, 2015 6:20 pm

Can you post a pic of your setup please
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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Wed Apr 15, 2015 9:02 pm

Mark,
What part of the setup would add most value to photograph?

Jack

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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Thu Apr 16, 2015 3:04 am

I got some better results today. Turns out that without a UV/IR filter, I get the blown out image. Each time I used the filter I got an image.

Here are some images and the FireCapture log.

FireCapture v2.3 (beta 15) Settings
------------------------------------
Camera=ZWO ASI120MM
Filter=CH4
Profile=Sun
Filename=Sun_162506.zip
Date=150415
Start=162506
Mid=162506
End=162506
Duration=0s
Frames captured=10
File type=BMP
Binning=no
ROI=1280x960
FPS (during start of capture)=30
Shutter=1.365ms
Gain=14
Brightness=8
USBTraffic=90
AutoExposure=off
Gamma=0
Histogramm(min)=1
Histogramm(max)=255
Histogramm=100%
Noise(avg.deviation)=10.41
Limit=10 Frames
Sensor temperature=40.0 °C / 104.0 °F

Produced:

Hang on...files not attaching...

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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Thu Apr 16, 2015 3:09 am

I got some better results today. Turns out that without a UV/IR filter, I get the blown out image. Each time I used the filter I got an image.

Here are some images and the FireCapture log.

FireCapture v2.3 (beta 15) Settings
------------------------------------
Camera=ZWO ASI120MM
Filter=CH4
Profile=Sun
Filename=Sun_162506.zip
Date=150415
Start=162506
Mid=162506
End=162506
Duration=0s
Frames captured=10
File type=BMP
Binning=no
ROI=1280x960
FPS (during start of capture)=30
Shutter=1.365ms
Gain=14
Brightness=8
USBTraffic=90
AutoExposure=off
Gamma=0
Histogramm(min)=1
Histogramm(max)=255
Histogramm=100%
Noise(avg.deviation)=10.41
Limit=10 Frames
Sensor temperature=40.0 °C / 104.0 °F

Produced:
Attachments
2015-04-15_20-07-29.png

Starry Jack
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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Thu Apr 16, 2015 3:13 am

These settings produced:
FireCapture v2.3 (beta 15) Settings
------------------------------------
Camera=ZWO ASI120MM
Filter=CH4
Profile=Sun
Filename=Sun_162604.zip
Date=150415
Start=162604
Mid=162604
End=162605
Duration=0s
Frames captured=10
File type=BMP
Binning=no
ROI=1280x960
FPS (during start of capture)=30
Shutter=1.365ms
Gain=14
Brightness=8
USBTraffic=90
AutoExposure=off
Gamma=0
Histogramm(min)=1
Histogramm(max)=255
Histogramm=100%
Noise(avg.deviation)=8.51
Limit=10 Frames
Sensor temperature=39.2 °C / 102.7 °F
Attachments
2015-04-15_20-07-29.png

Starry Jack
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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Thu Apr 16, 2015 3:16 am

FireCapture v2.3 (beta 15) Settings
------------------------------------
Camera=ZWO ASI120MM
Filter=CH4
Profile=Sun
Filename=Sun_162322.zip
Date=150415
Start=162322
Mid=162322
End=162322
Duration=0s
Frames captured=10
File type=BMP
Binning=no
ROI=1280x960
FPS (during start of capture)=30
Shutter=3.765ms
Gain=35
Brightness=8
USBTraffic=90
AutoExposure=off
Gamma=0
Histogramm(min)=1
Histogramm(max)=255
Histogramm=100%
Noise(avg.deviation)=2.37
Limit=10 Frames
Sensor temperature=40.8 °C / 105.3 °F

Produced:
Attachments
2015-04-15_20-15-19.png
2015-04-15_20-15-19.png (162.61 KiB) Viewed 2102 times

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Re: ZWOASI120MM and Too Much Light

Post by marktownley » Thu Apr 16, 2015 4:58 am

An out of band leak, makes sense...
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Re: ZWOASI120MM and Too Much Light

Post by swisswalter » Thu Apr 16, 2015 5:18 am

Hi Jack

now take a 2x barlow and tweak the etalon
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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Re: ZWOASI120MM and Too Much Light

Post by Starry Jack » Fri Apr 17, 2015 6:35 pm

Where does the out of bandwidth leak occur? In the filters or the mechanics of the OTA?

I will be switching cameras for tomorrow's test (Saturday) and will apply the Barlow at that time.

Jack

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Re: ZWOASI120MM and Too Much Light

Post by marktownley » Fri Apr 17, 2015 8:07 pm

leaks are always in the filters
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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