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Lou took this great image of a prom with his Lunt152 double stacked with a Quark

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Lovely big prom today | Sept 15th 2019

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Lovely big prom today | Sept 15th 2019

Post by MalVeauX » Sun Sep 15, 2019 7:19 pm

Heya,

Mostly cloudy today, rained off and on, couldn't get a serious session in. I was doing visual with my PST while the kids were playing in the yard. Noticed a fine prom, maybe a deteriorating hedgerow, on the North of the disc that was pretty bright and had a lot of definition and it seemed paired and the second to it looked like it may just lift off at any time so I watched it a while. I tempted fate and took a peak with a bigger scope and managed to see it. Seeing was dreadful since it was 2pm in the afternoon. Truly bad. But managed to get a little bit of something to go off. I didn't have enough clear sky time to use a smaller scale so I had to suffer the seeing. It's still out there and quite nice to see in some binos!

Image

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Image

Image

Image

Very best,

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Re: Lovely big prom today | Sept 15th 2019

Post by MAURITS » Sun Sep 15, 2019 7:57 pm

Very nice Marty, I saw these proms visual too.
Are the captures done wit the 290 MM camera?
Regards,
Maurits

Vista del Cielo Observatory

www.vistadelcielo.be

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Re: Lovely big prom today | Sept 15th 2019

Post by MalVeauX » Sun Sep 15, 2019 8:07 pm

MAURITS wrote:
Sun Sep 15, 2019 7:57 pm
Are the captures done wit the 290 MM camera?
Yessir, all my latest work is done with the ASI290MM. I find it works great for solar, it's very sensitive to the wavelengths and IR unlike other small pixel sensors. The global shutter is not a problem either. The surface images were at F10, 2.2ms exposure time, 0 gain at 62FPS with a flat frame (the flat frame automatically slows it down by over 20+ FPS in firecapture I find).

Very best,

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Re: Lovely big prom today | Sept 15th 2019

Post by yltansg » Sun Sep 15, 2019 11:22 pm

Hi Marty,
Nice prom capture!!

Alfred

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Re: Lovely big prom today | Sept 15th 2019

Post by MapleRidge » Mon Sep 16, 2019 12:50 am

Nice to see your efforts paid off Marty...The prom is especially sharp :bow

Brian
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Re: Lovely big prom today | Sept 15th 2019

Post by marktownley » Tue Sep 17, 2019 9:19 pm

These look great Marty!
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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Re: Lovely big prom today | Sept 15th 2019

Post by eroel » Tue Sep 17, 2019 10:57 pm

Marty:
A nice session.
Regards,
Eric.

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Re: Lovely big prom today | Sept 15th 2019

Post by DeepSolar64 » Wed Sep 18, 2019 4:40 am

Marty,
You still did very well considering the seeing.

James

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Re: Lovely big prom today | Sept 15th 2019

Post by Montana » Wed Sep 18, 2019 8:52 am

That's a beauty Marty, I'm glad you pulled out the bigger scope for it :bow

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Re: Lovely big prom today | Sept 15th 2019

Post by solarchatted » Wed Sep 18, 2019 10:32 am

Lovely details!
I have checked out the 290M too sometime ago and I am guessing it really matches your setup.
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Re: Lovely big prom today | Sept 15th 2019

Post by MalVeauX » Wed Sep 18, 2019 12:17 pm

solarchatted wrote:
Wed Sep 18, 2019 10:32 am
I have checked out the 290M too sometime ago and I am guessing it really matches your setup.
I moved over to the 290 from the IMX178 sensor for small pixel work, while it has fewer pixels and a smaller sensor, it's well suited to high resolution solar system photography just as it is used for planetary imaging to avoid needing barlows/powermates, adding more glass and more loss of transmission, reflections, etc. The 290 sensor is more sensitive in the IR range which is great for solar and lunar and it's a fast throughput camera so high FPS is there for imaging. I've been putting it through all the paces and so far it's pretty much replaced my IMX174 sensor too. My systems can all be F10 or F21 so ideally matching to the small pixels or the large pixels in the deep red and IR wavelengths, so why use the IMX174 and extra glass to get to F21 or use reducers to get down to F21 when I can just shoot at F10 with the 290's 2.9um pixels and no added glass. So far, I like it!

Very best,

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Re: Lovely big prom today | Sept 15th 2019

Post by Carbon60 » Wed Sep 18, 2019 7:55 pm

Another fine set, Marty.

Stu.
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DMK41, Basler acA1920-155
NEQ6 Pro-mount
Fluxgate Magnetometers (1s and 150s Cadence)
More images at http://www.flickr.com/photos/solarcarbon60/

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Re: Lovely big prom today | Sept 15th 2019

Post by solarchatted » Sun Sep 22, 2019 12:27 pm

MalVeauX wrote:
Wed Sep 18, 2019 12:17 pm
solarchatted wrote:
Wed Sep 18, 2019 10:32 am
I have checked out the 290M too sometime ago and I am guessing it really matches your setup.
I moved over to the 290 from the IMX178 sensor for small pixel work,...

Very best,
Thank you for confirming it.

I have been meaning to get a 290M for years, not just for solar - even thou I am no expert I always thought to main thing is you get rid of lenses in between, but never been sure - I saw Solar images done with that camera and they were stunning!

Great to know, useful for high magnification on Moon and Planets too!

ADDITION: but probably better get the USB3 one for higher frame rate - although it depends on computer USB bandwidth anyway!
One to think about ... will test my 178M USB3 and USB 2 to see the 'real' difference.

This Laptop has only 3x USB2 + 1x USB3 by using the blooming express card and I never used it for 178M USB3 - but I do have a very good USB Hub with own 2.5A PSU - will try that now and see what happens - just on the table, no sun visible today!

I also checked using Filed of View and Stellarium to see real magnification and I see it is about 30% more than 178M.
290M Results
FOV: 21.45' x 12.14'
Resolution: 0.66"/pixel
Area: 260.4 sq'
Focal length: 900mm
Focal ratio: f/10.0

178M Results setting FOV app with 4.8µm and 1548 x 1030 to MAKE it binning 2x - as needed with this camera and AR90/900 for best overall resolution (as guided by MarkTownley great insights and help I had)
FOV: 28.38' x 18.88'
Resolution: 1.10"/pixel
Area: 0.15 sq°
Focal length: 900mm
Focal ratio: f/10.0

I hope I did not get the details wrong on the 178M and I believe this was what made me stop to buy the 290M, but I never thought about the fact of less lenses in the middle!
I also wished to get the 290M as a Guider for Deep Sky, instead of using the 178M.
QE seems to be about the same ~75% and the 178M at 75% is pretty good I have seen the impossible to see with this camera and the colour one too - seeing Orion Nebula live on screen and in particular the Trapezium using the LX200 R - just stunning!
It might be on my website that image and I was only playing with it once...

.... yes it is here:
https://astronomo.space/my-images/deep- ... 1&slide=19

(Slide number above might change, when adding more images)
Last edited by solarchatted on Sun Sep 22, 2019 1:36 pm, edited 2 times in total.
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Re: Lovely big prom today | Sept 15th 2019

Post by Starry Jack » Sun Sep 22, 2019 1:28 pm

Your work is always a target I compare mine to.
Explore Scientific 152mm f6.5 achromat
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation

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Re: Lovely big prom today | Sept 15th 2019

Post by MalVeauX » Mon Sep 23, 2019 1:14 am

solarchatted wrote:
Sun Sep 22, 2019 12:27 pm
I hope I did not get the details wrong on the 178M and I believe this was what made me stop to buy the 290M, but I never thought about the fact of less lenses in the middle!
I also wished to get the 290M as a Guider for Deep Sky, instead of using the 178M.
QE seems to be about the same ~75% and the 178M at 75% is pretty good I have seen the impossible to see with this camera and the colour one too - seeing Orion Nebula live on screen and in particular the Trapezium using the LX200 R - just stunning!
It might be on my website that image and I was only playing with it once...



Heya,

When you bin the pixels of the IMX178 to 4.8um, you also are going to have to extend the focal-ratio to achieve critical sampling. The beauty of 2.4um pixels is that it matches well to F9 focal-ratios for 656nm. But, it does it with slow FPS due to the large pixel array. Binning to 4.8um effectively requires you to now need F18 focal-ratio for 656nm to critically sample. So while it will increase FPS, it also requires a 2x barlow inline (more glass, more gradients, more dust surfaces, etc).

That said, the efficiency and sensitivity at 656nm is not the same. The 290MM is more sensitive. I used to use the IMX178 in the same focal-ratios and the 290MM fills the histogram with less gain. I can't explain why though.

For me though, having the IMX174, IMX178 and 290 sensors, I use the 290 more often. Less glass. No reducers. No barlows/extenders. Less dust. Less problems. Less insignificant transmission loss to other things in the imaging train. Less gradients to fix. Faster focal-ratio. And this camera has high FPS on its own without binning or doing any of that.

But again, at the end of the day, real world results, the 290 is more sensitive than the IMX178 and there's no need to bin and then use a barlow to get the sampling right with the focal-ratio. So I sold my IMX178 after using these three sensors. If I get another large small pixel sensor, it would be the IMX183 probably. But for now, I'm finding the 290 does the job for all of this more efficiently with less stuff in the imaging train.

Very best,

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Re: Lovely big prom today | Sept 15th 2019

Post by solarchatted » Sun Oct 06, 2019 2:03 pm

[/quote][/i]

...

But again, at the end of the day, real world results, the 290 is more sensitive than the IMX178 and there's no need to bin and then use a barlow to get the sampling right with the focal-ratio. So I sold my IMX178 after using these three sensors. If I get another large small pixel sensor, it would be the IMX183 probably. But for now, I'm finding the 290 does the job for all of this more efficiently with less stuff in the imaging train.

Very best,
[/quote]

Well explained, thank you - I know am sure I will need the 290M too!
But USB2 or USB3 ?

:bow
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Re: Lovely big prom today | Sept 15th 2019

Post by MalVeauX » Mon Oct 07, 2019 1:25 am

solarchatted wrote:
Sun Oct 06, 2019 2:03 pm

But USB2 or USB3 ?
USB2 version maxes out at 20FPS full pixel array.
USB3 version maxes out at 82FPS (12bit), 170FPS (10bit).
I wouldn't even consider a USB2 interface speed for imaging anything more than course scale, full disc FOV.

Very best,

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Re: Lovely big prom today | Sept 15th 2019

Post by solarchatted » Wed Oct 09, 2019 3:37 pm

:bow2
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