ZWO ASI 178 or 183 mono

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Merlin66
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ZWO ASI 178 or 183 mono

Post by Merlin66 » Thu Feb 15, 2018 10:25 pm

Any comment/ recommendations on either of these two cameras for full disk solar recording.
I realise the 183 with the larger chip will give more flexibility on telescope focal length, but I think at the price of over sampling with the 2.4micron pixel.
Any users out there????
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Re: ZWO ASI 178 or 183 mono

Post by MapleRidge » Sat Feb 17, 2018 12:25 am

Hi Ken...

I don't have either of these cameras, but I do use the ASI290 with 2.9u pixels for planetary work and it works pretty nicely.

As for the two you mentioned they appear to be pretty much identical...same size pixels, same exposure range, not a lot of direct spectral response info on the ZWO site, but the 183 looks to be a scaled up array from the 178 chip. The 178 is listed as being 14 bit and the 183 is listed at 12 bit and both have rolling shutter. The ZWO site does not list read noise, QE, or full well capacity for the 178 and only states the noise for the 183. I'm sure they are listed d on the manufacturers data sheets, just no time to hunt them down right now.

The 183 should do well for full disk with focal lengths under 900mm which has a FOV 50' x 33' which will have poles hugging the edge of the field. For longer focal lengths you could bin to reduce over sampling and maybe gain some on the frame rate too.

I have not been happy with the ASI1600 I picked up 2 years ago...this might be an alternative option for doing full disks!!!

Brian
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Re: ZWO ASI 178 or 183 mono

Post by Merlin66 » Sat Feb 17, 2018 1:07 am

Brian,
Thanks for that.
A reduced ROI with the 183 to the same fov as 178 seems to allow the same high frame rates....
Note: Binning doesn't appear to be an option on CMOS cameras :(
"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: ZWO ASI 178 or 183 mono

Post by Valery » Sat Feb 17, 2018 5:21 am

Hello Ken,

Are you sure you are so willing to spend a lot of money for a new camera to image a bald sun for a next couple of years untill the sun will start to awoke?

http://halpha.nso.edu/keep/hag/201802/2 ... 3830Ch.jpg

I believe that now is a time to image the sun locally, it's most interesting things like prominences, dark filaments and may be rare smaller spots. Needs at least 100mm of aperture.

When the sun will be active again and looks nicely, better or cheaper camers will be on the market for the sun portraits.


Valery
Last edited by Valery on Sat Feb 17, 2018 5:31 am, edited 1 time in total.
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Re: ZWO ASI 178 or 183 mono

Post by Valery » Sat Feb 17, 2018 5:22 am

Merlin66 wrote:
Sat Feb 17, 2018 1:07 am

Note: Binning doesn't appear to be an option on CMOS cameras :(
Why ?
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: ZWO ASI 178 or 183 mono

Post by Merlin66 » Sat Feb 17, 2018 5:40 am

To quote a reply I got:
""
Its the CMOS architecture. With CCD there is just one ADC. The electrons in each row are shifted down then on the bottom row, each pixel gets shifted to be read and digitised in the ADC. To bin 2x2, two rows are shifted down (and their electrons combined) and then two pixels get shifted to the read circuitry.

With CMOS there is an ADC on each row so the pixels on each row get shifted together to their respective read circuits and ADCs so there is no opportunity to combine the charges from each row before reading.
""
I agree things may be quiet for a while, but I still have opportunities with the multi-band Spectroheliograph.
My current options are the small QHY5Lii and the ASI 174MM. There's also the older DMK41 and the slooooow (doesn't like USB3) DMK51.
"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: ZWO ASI 178 or 183 mono

Post by PDB » Sat Feb 17, 2018 8:18 am

Hi,

I have the ASI178 mono and for planetary imaging with the C8 in the focal plane it is a good match (just slightly oversampled) . For solar work that cam gives me constant headaches due to square artifacts which always show up in the image. This seems to happen only in H-Alfa and also if I do some testing under LED light.

Paul

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Re: ZWO ASI 178 or 183 mono

Post by skywatcher1 » Sun Feb 18, 2018 5:15 pm

ll.jpg
ll.jpg (152.46 KiB) Viewed 798 times
Just joined, and my 178 arrives MONDAY

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