Another ASI 178MM Question

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Another ASI 178MM Question

Post by rray6 » Thu Feb 18, 2021 5:31 pm

Hello All,
I've been off my solar game for a while (a personal solar minimum) but have been slowly starting to get back into it. I was checking my camera situation and realized that my old ZWO ASI 174MM was weather-damaged due to a leaky roof. I want to replace it with the same or something better if there is such a thing. I've been looking at the ASI 178MM and would like some feedback from anyone who has used it. I realize that there are other topics skirting around this issue but I wanted to specifically ask about the 178. My main solar scopes are the Lunt LS80THA DSII (FR: 7, FL: 560 mm) and Wm Optics 132mm f/7 (FL: 925 mm) for white light and CaK.

Hope everyone is weathering the pandemic safely.

-Robert


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Last night as I lay in bed looking up at the stars in the sky, I thought to myself -- "Where the heck is the ceiling???"

www.redshift48.com
Lunt LS80 DSII B1800
WO 132mm f/7
Stellarvue 80mm Raptor SVR80ST2
Lunt CaK B1800 Filter
Baader Herschel - Photo
PGR Grasshopper 3.0 (ICX687 - mono)
Imaging Source DMK 41 (mono) and DBK 21 AU618 (color)
ZWO ASI174MM (monochrome) with filter wheel
SBIG STT8300M
Canon 5D Mark IV
AP 1200GTO (Permanent) and iOptron CEM60(he) and CEM25 Mounts

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Re: Another ASI 178MM Question

Post by EGRAY_OBSERVATORY » Thu Feb 18, 2021 11:06 pm

Hi Robert,
https://astronomy.tools/calculators/field_of_view/ will show you the best camera to use with whatever scope and set-up you use..

I have two ASI 178Mm cams in use for Ha and Cak and no known problems to date. USB-3 capable, but will run on USB-2...

Cheers
Terry



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Re: Another ASI 178MM Question

Post by rray6 » Fri Feb 19, 2021 1:46 am

Terry,
Thanks so much. I knew of this Astronomy Tools Calculator but never used it much. After plugging in my scope data, I think I could get some good use from the ASI 178 for several of my scopes depending on my barlow use. In any case, I think it will be a good addition to my cameras. And that calculator will be very useful for camera selection for all my imaging projects. Thanks again!!!


Robert Ray
Last night as I lay in bed looking up at the stars in the sky, I thought to myself -- "Where the heck is the ceiling???"

www.redshift48.com
Lunt LS80 DSII B1800
WO 132mm f/7
Stellarvue 80mm Raptor SVR80ST2
Lunt CaK B1800 Filter
Baader Herschel - Photo
PGR Grasshopper 3.0 (ICX687 - mono)
Imaging Source DMK 41 (mono) and DBK 21 AU618 (color)
ZWO ASI174MM (monochrome) with filter wheel
SBIG STT8300M
Canon 5D Mark IV
AP 1200GTO (Permanent) and iOptron CEM60(he) and CEM25 Mounts

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Re: Another ASI 178MM Question

Post by ammonthenephite » Fri Feb 19, 2021 2:35 am

I generally like my 178mm, but I'm one of those that when using it for solar h-alpha I get fixed pattern noise from the sensor that limits how much sharpening I can do on small details. For this reason I'll soon be looking for a different camera to replace it, though I have no idea which one to get, lol.


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Re: Another ASI 178MM Question

Post by Merlin66 » Fri Feb 19, 2021 3:27 am

Hmmmm.
I've just ordered an ASI 178MM for my small(er) SHG.
I hadn't heard of any fixed pattern noise issues.
Do you have any sample images???


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Re: Another ASI 178MM Question

Post by rray6 » Fri Feb 19, 2021 4:13 am

Yes, I would like to see some samples of fixed pattern noise, too.

-Robert


Robert Ray
Last night as I lay in bed looking up at the stars in the sky, I thought to myself -- "Where the heck is the ceiling???"

www.redshift48.com
Lunt LS80 DSII B1800
WO 132mm f/7
Stellarvue 80mm Raptor SVR80ST2
Lunt CaK B1800 Filter
Baader Herschel - Photo
PGR Grasshopper 3.0 (ICX687 - mono)
Imaging Source DMK 41 (mono) and DBK 21 AU618 (color)
ZWO ASI174MM (monochrome) with filter wheel
SBIG STT8300M
Canon 5D Mark IV
AP 1200GTO (Permanent) and iOptron CEM60(he) and CEM25 Mounts

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Re: Another ASI 178MM Question

Post by Merlin66 » Fri Feb 19, 2021 4:27 am

I found the extensive thread on CN Re FPN with the ASI 178. It seems to be the same problem I experienced with an ASI 183MM. I returned it to ZWO and replaced with a ASI 1600MM.
https://www.cloudynights.com/topic/7004 ... a-imaging/
(Google ASI 178MM FPN and click the images tab for examples)


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Re: Another ASI 178MM Question

Post by rray6 » Fri Feb 19, 2021 4:54 am

Well, you have given me a lot to think about. Who said solar imaging was easy?


Robert Ray
Last night as I lay in bed looking up at the stars in the sky, I thought to myself -- "Where the heck is the ceiling???"

www.redshift48.com
Lunt LS80 DSII B1800
WO 132mm f/7
Stellarvue 80mm Raptor SVR80ST2
Lunt CaK B1800 Filter
Baader Herschel - Photo
PGR Grasshopper 3.0 (ICX687 - mono)
Imaging Source DMK 41 (mono) and DBK 21 AU618 (color)
ZWO ASI174MM (monochrome) with filter wheel
SBIG STT8300M
Canon 5D Mark IV
AP 1200GTO (Permanent) and iOptron CEM60(he) and CEM25 Mounts

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Re: Another ASI 178MM Question

Post by marktownley » Fri Feb 19, 2021 8:06 am

Hi Robert.

The 178 is suited for prime focus imaging with the setups you list, however, as others have said there can be a fixed pattern noise issue. For close up views a 174 chipped camera would be better.

Mark


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Re: Another ASI 178MM Question

Post by krakatoa1883 » Fri Feb 19, 2021 1:29 pm

Nothing to be worried with, the FPN can be easily removed by taking a flat, actually any H alpha image would benefit from this irrespective of the camera used. Never seen the FPN on full disc images taken with my 178, though.


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Re: Another ASI 178MM Question

Post by rray6 » Sat Feb 20, 2021 1:05 am

Could it be that part of the problem (FPN) with the 178 is due to rolling vs global shutter?

-Robert


Robert Ray
Last night as I lay in bed looking up at the stars in the sky, I thought to myself -- "Where the heck is the ceiling???"

www.redshift48.com
Lunt LS80 DSII B1800
WO 132mm f/7
Stellarvue 80mm Raptor SVR80ST2
Lunt CaK B1800 Filter
Baader Herschel - Photo
PGR Grasshopper 3.0 (ICX687 - mono)
Imaging Source DMK 41 (mono) and DBK 21 AU618 (color)
ZWO ASI174MM (monochrome) with filter wheel
SBIG STT8300M
Canon 5D Mark IV
AP 1200GTO (Permanent) and iOptron CEM60(he) and CEM25 Mounts

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Re: Another ASI 178MM Question

Post by Merlin66 » Sat Feb 20, 2021 1:20 am

IMHO, I think it is due to the very small pixels and us trying to use it at 1x1 binning.
Doesn’t seem to be related to the shutter.


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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