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Maximum Integration Times

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#1 Orion64



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Posted 08 July 2014 - 01:02 PM

Are there any guidelines to follow on what the maximum total time is one should shoot video on solar images?

I am assuming it differs at each focal length. But are there guidelines on how long it takes before change in the solar surface is noticed? Does it matter between white light, Ha or CaK imaging?

#2 sullij1


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Posted 08 July 2014 - 01:25 PM

I keep it down to 1000 to 2000 frames per avi. This is because this seems to be the limit for most stacking software before it stops working.

#3 dvmak


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Posted 08 July 2014 - 01:50 PM

Sometimes I use up to 10000 frames, trying to get good frames for stacking. SER format generated by Firecapture is easily managed by Autostakkert (I have 16Gb of RAM and Win 7 x64).

But the technical issues can be one limitation, another is the changes of the fine details. and it depends on what are you imaging. Some prominences can evolve fast, Ellerman bombs are very fast, some changes in granulation at hi res can also be fast. I suppose few minutes are limiting in many cases.

#4 ch-viladrich


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Posted 08 July 2014 - 04:08 PM

Hi Bret,

Here are some guidelines :
- for white light imaging : the granulation evolves quite rapidly. Max integration times should be 40 s for a 150 mm diameter telescope, but only 25 s for a 350 mm telescope. You can interpolate between these values for your own diameter.

- for Ca K : when there is not much activity, you can use the max time for white light, but when there is a surge, things can change dramatically in a matter of seconds...

- for Ha : again the max time for white light is a good starting value. But with a rapidly evolving prominence you could have to divide this time by two.

Hope this helps

#5 Orion64



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Posted 08 July 2014 - 04:57 PM

Dmitri and Christian, you have some really impressive images on your websites.

Christian, why do you mention telescope diameter and not focal length? On what focal length did you base your telescope diameter on?

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