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Old 25-03-2013, 10:31 AM
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RickS (Rick)
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Originally Posted by Shiraz View Post
Three approaches to determining appropriate sub lengths were investigated:
1. Initially tried the standard broadband sub-exposure strategy of “read noise = 5% of total background noise” (See the earlier broadband discussion and the following websites: ). This strategy can be applied to narrowband imaging with the proviso that total background noise includes dark current as well as Poisson noise. This approach can lead to extremely long optimum Ha sub exposures for low QE CCDs – to the point of impracticality.
Hi Ray,

I don't have time to dig through your post in detail right now, unfortunately, but it looks like a very interesting analysis.

In case you haven't seen it before, here's another take on determining optimal sub-exposure length:

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