New DMK with Sony 174 chip

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Merlin66
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New DMK with Sony 174 chip

Post by Merlin66 » Thu Oct 08, 2015 10:00 pm

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Re: New DMK with Sony 174 chip

Post by marktownley » Thu Oct 08, 2015 10:22 pm

Yup, that's interesting :)
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Re: New DMK with Sony 174 chip

Post by Valery » Fri Oct 09, 2015 1:20 am

marktownley wrote:Yup, that's interesting :)

Too slow fps. Definitely not interesting thing.
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Re: New DMK with Sony 174 chip

Post by Merlin66 » Fri Oct 09, 2015 1:35 am

May be of more interest to the SHG guys.....
Where each frame is a final image, we don't have the luxury of stacking to improve the image depth (Yet)
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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Re: New DMK with Sony 174 chip

Post by marktownley » Fri Oct 09, 2015 5:52 am

It does 54fps Valery...
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Re: New DMK with Sony 174 chip

Post by Gordon Ewen » Fri Oct 09, 2015 4:05 pm

The ZWO camera with the IMX174 chip runs nearly 3x faster on USB3. Didn't see a price for the DMK camera on the IS website.
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Re: New DMK with Sony 174 chip

Post by Valery » Fri Oct 09, 2015 5:41 pm

Gordon Ewen wrote:The ZWO camera with the IMX174 chip runs nearly 3x faster on USB3. Didn't see a price for the DMK camera on the IS website.
Gordon
Yes, ZWO's camera is 3x !!!! faster. So, the IS camera is outsider. And I am sure that IS is also more expensive. ZWO also has a
cooled ( -35C to ambient) variant ! +$300 however.


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Last edited by Valery on Fri Oct 16, 2015 5:15 pm, edited 1 time in total.
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Re: New DMK with Sony 174 chip

Post by marktownley » Sat Oct 10, 2015 6:55 am

fair enough then :)
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Re: New DMK with Sony 174 chip

Post by Merlin66 » Thu Oct 15, 2015 9:57 pm

I asked TIS what the frame rate would be with an ROI of 1920 x 24 pixel (for SHG applications)
They sent me an example taken at >800fps!
How does that compare with the ASI 174?
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https://groups.yahoo.com/neo/groups/ast ... scopy/info
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Re: New DMK with Sony 174 chip

Post by Montana » Fri Oct 16, 2015 9:19 am

:shock:

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Re: New DMK with Sony 174 chip

Post by michael.h.f.wilkinson » Fri Oct 16, 2015 3:15 pm

Merlin66 wrote:I asked TIS what the frame rate would be with an ROI of 1920 x 24 pixel (for SHG applications)
They sent me an example taken at >800fps!
How does that compare with the ASI 174?
I think the ASI174MM might beat that IF the exposure time is short enough. Assuming the data rate is the limiting factor, using linear extrapolation form the frame rate at 640x480 (397 FPS) we get 2,646 FPS :shock: (370 microsecond exposure time). I get the feeling TIS missed the boat on this one.
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Re: New DMK with Sony 174 chip

Post by fjabet » Sat Oct 17, 2015 2:04 pm

The Basler 1920 can go at more than 1000 fps with AoI :)
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Re: New DMK with Sony 174 chip

Post by Merlin66 » Sat Oct 17, 2015 11:32 pm

The issue I see with the higher frame rates (for SHG) is getting enough signal, and ending up with both lack of contrast and low SNR.
It's OK when you can stack hundreds of frames to improve the SNR.
What does the histogram of a single frame look like at 1000fps?
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: New DMK with Sony 174 chip

Post by fjabet » Mon Oct 19, 2015 11:31 am

We usually have plenty of light in solar imaging. With the HaT and the PST Etalon my exposure is about 3ms at F/D 27.5. That gives room for higher throuput.
In white light it is sub ms.
The IMX174 presents very good performances with full 24db gain.
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http://www.airylab.fr/AirylabUS/index.p ... &Itemid=57

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Re: New DMK with Sony 174 chip

Post by Merlin66 » Wed Oct 21, 2015 9:55 pm

OK.
Can any ZWO ASI 174 user confirm the frame rates when using a ROI of 1920 x 24 pixel????
I see this as a significant opportunity to develop a high speed SHG based on a nodding mirror scanner. If a frame rate is >500 fps then a scan of 4sec would give a good resolution and a possibility of obtaining >12 complete scans per min. These (as hopefully the solar feature movements would be small in a 1 min time frame (?) would then allow stacking of the individual spectral frames prior to image extraction.)
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: New DMK with Sony 174 chip

Post by fjabet » Fri Oct 23, 2015 2:05 pm

Can't tell you for the ZWO, but the Basler achieved 2200 fps at this size (with internal 12 bits processing, not 10 bits).
Looking for professional reports about telescopes ?

http://www.airylab.fr/AirylabUS/index.p ... &Itemid=57

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Re: New DMK with Sony 174 chip

Post by Astrograph » Fri Dec 04, 2015 12:51 am

I have to admit to being bias but I think the best IMX174 camera was the first one made with the chip and that is the PGR Grasshopper 3. I have never tried the Basler but I would take a PGR over a ZWO any day. As for IS, all I ever hear about IS cameras is how much noise they generate.....

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