1st Dec Full Disk

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minhlead
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1st Dec Full Disk

Post by minhlead »

I think I improved a bit on sharpness by increasing the gain and lower exposure time. Was 1.8ms and have quite a lot of blurriness across the disk. Now I am exposing for about 0.4 ms and the result look much sharper.
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Re: 1st Dec Full Disk

Post by Montana »

Oh yes!! very very nice indeed :bow :hamster: it looks a bit more on band today also

Alexandra


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Re: 1st Dec Full Disk

Post by rigel123 »

That shorter exposure is much better.


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Re: 1st Dec Full Disk

Post by minhlead »

Montana wrote: Wed Dec 01, 2021 12:12 pm Oh yes!! very very nice indeed :bow :hamster: it looks a bit more on band today also

Alexandra
Yeah. The last few days I did not turn on the cooler. Thought I do not need it since it's winter and ambient temperature is around 20*C. But apparently my Quark still requires the cooler to be onband.


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Re: 1st Dec Full Disk

Post by minhlead »

rigel123 wrote: Wed Dec 01, 2021 12:21 pm That shorter exposure is much better.
Yeap. Did not expect such a big improvement. I have never ever thought 2ms exposure is still too long. I used to shoot planetary and anything under 5ms is more than enough to beat the seeing. Apparently solar need much shorter exposure time.


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Re: 1st Dec Full Disk

Post by Rusted »

minhlead wrote: Wed Dec 01, 2021 12:51 pm
rigel123 wrote: Wed Dec 01, 2021 12:21 pm That shorter exposure is much better.
Yeap. Did not expect such a big improvement. I have never ever thought 2ms exposure is still too long. I used to shoot planetary and anything under 5ms is more than enough to beat the seeing. Apparently solar need much shorter exposure time.
Interesting. My own exposures are around 10ms at this time of year. [Weather permitting.]
Opinions seem to vary widely on whether this is short enough to beat the seeing.
I used to try and get exposures as short as possible even at the cost of increased gain.
The Lunt B1200S2 is very dim compared with the PST BF5. I now only use the latter on proms.

Congratulations on your SPOD. :bow


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Re: 1st Dec Full Disk

Post by minhlead »

Rusted wrote: Wed Dec 01, 2021 4:07 pm
minhlead wrote: Wed Dec 01, 2021 12:51 pm
rigel123 wrote: Wed Dec 01, 2021 12:21 pm That shorter exposure is much better.
Yeap. Did not expect such a big improvement. I have never ever thought 2ms exposure is still too long. I used to shoot planetary and anything under 5ms is more than enough to beat the seeing. Apparently solar need much shorter exposure time.
Interesting. My own exposures are around 10ms at this time of year. [Weather permitting.]
Opinions seem to vary widely on whether this is short enough to beat the seeing.
I used to try and get exposures as short as possible even at the cost of increased gain.
The Lunt B1200S2 is very dim compared with the PST BF5. I now only use the latter on proms.

Congratulations on your SPOD. :bow
I am surprised too. But some gain is not a bad thing. A right amount of gain would induce some random noise which in turn will increase bitdepth of the stacked image.
https://www.stark-labs.com/craig/resour ... acking.pdf
If you have the time, read this. A very compelling read on the impact of stacking on bitdepth.


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Re: 1st Dec Full Disk

Post by EGRAY_OBSERVATORY »

Congrats on the SPOD Minh. Well deserved

Terry


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Re: 1st Dec Full Disk

Post by rigel123 »

Rusted wrote: Wed Dec 01, 2021 4:07 pm
minhlead wrote: Wed Dec 01, 2021 12:51 pm
rigel123 wrote: Wed Dec 01, 2021 12:21 pm That shorter exposure is much better.
Yeap. Did not expect such a big improvement. I have never ever thought 2ms exposure is still too long. I used to shoot planetary and anything under 5ms is more than enough to beat the seeing. Apparently solar need much shorter exposure time.
Interesting. My own exposures are around 10ms at this time of year. [Weather permitting.]
Opinions seem to vary widely on whether this is short enough to beat the seeing.
I used to try and get exposures as short as possible even at the cost of increased gain.
The Lunt B1200S2 is very dim compared with the PST BF5. I now only use the latter on proms.

Congratulations on your SPOD. :bow
I misread his original exposures, because I am typically between 2 - 10 ms so you are right, the change shouldn't have made that big of an improvement so I wonder if it was a change in seeing instead.


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Re: 1st Dec Full Disk

Post by DeepSolar64 »

Very nice!! It just needs to be rotated.

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Re: 1st Dec Full Disk

Post by minhlead »

DeepSolar64 wrote: Wed Dec 01, 2021 7:40 pm Very nice!! It just needs to be rotated.

JP
Ha ha. I agree.
rigel123 wrote: Wed Dec 01, 2021 7:10 pm I misread his original exposures, because I am typically between 2 - 10 ms so you are right, the change shouldn't have made that big of an improvement so I wonder if it was a change in seeing instead.
I switched several time between exposure time and the result is the same. Shorter exposure always sharper.
EGRAY_OBSERVATORY wrote: Wed Dec 01, 2021 6:24 pm Congrats on the SPOD Minh. Well deserved

Terry
Thanks Terry. I am honored.


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Re: 1st Dec Full Disk

Post by torsinadoc »

Very nice!


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Re: 1st Dec Full Disk

Post by jacinto »

Spectacular image of the entire disk of the sun, Congratulations !!!

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Re: 1st Dec Full Disk

Post by DeepSolar64 »

And congratulations on the SPOD!!


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Re: 1st Dec Full Disk

Post by Rusted »

minhlead wrote: Wed Dec 01, 2021 4:22 pm
I am surprised too. But some gain is not a bad thing. A right amount of gain would induce some random noise which in turn will increase bit depth of the stacked image.
https://www.stark-labs.com/craig/resour ... acking.pdf
If you have the time, read this. A very compelling read on the impact of stacking on bit depth.
Thanks for the link.

There is a balance [seesaw effect] with relation to FPS and Gain.
As exposure shortens the Frames Per Second simultaneously go up.
This provides more frames to stack in a given time period.
Meaning more data + less drift during the total capture period.

I find that things go bad when SharpCap Gain approaches 200 in winter.
This may not be true for wider fields.
I am only ever imaging at high resolution with tiny fields of view.
150/10 =1500mm x [1.6 or 2x or 2.6x] GPC x [IMX174] Sensor Crop Factor.


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H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
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