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That extra 21x2 minutes hardly seems worth it Jorge. Just a little less noise.
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yes, and I must be glad with this. Less noise only by some 2 minutes frames. Wow ! It is very cheap ! I must try with 1 minute, would have the same performance ?
With star clusters, the secret for a good shot is don't saturate the brightness stars. If they are saturated (all white color or exploded appearance) the photo will be lost, since that to reduce those informations in graphic process is very hard. Mainly if you will stack them in DSS.
Therefore, I see that sometimes 4 x 1 minute give better final results than 1 x 4 minutes.
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The theory is that 1 x 4 minute is better than 4 x 1 minute.
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Yes, you are right. But for the theory ! You must adjust these theories to work with your true reallity. Think about high sky glow.
Another issue: with high camera temperature the read noise will nothing with reference to thermal noise.
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consider cooling your camera
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I am thinking about. I have some difficulty to find a way to make it, because of accessories: filter wheel and OAG. I can't do a common modification.
The weight and fan vibration would be another issue.
Undoubtly this is the most important modification that I must to do. My thermal noise is absurd !