Hi Steve and others,
Thanks for the sheet!
I am sorry for asking but I am a newbie. I own an ASI294MC pro. My understanding of the table in the Exposure Calculator tab is that we theoretically don't need the long subs (60s, 180s, 300s...) that people normally use. With an urban sky, subs exposure of 10s-15s are enough at more or less any gain (above unity gain). The inconvenient is that we then need hundreds or thousands of subs to reach the desired integration time. Is that a correct interpretation? Can we have longer exposure though? I would love to have a Gain and Sub-exposure tables such as the one proposed in https://www.cloudyni...olour-versions/ applicable for the 294MC would be great to help me understand better.
Many thanks again.
Hi in theory yes, that’s the exposure you need to swamp the RN
To avoid saturating the HD with subs you have a few options:
- use a LP or “OSC narrowband” filter (like opto long L-enhance). You will adjust the spreadsheet bandwidth accordingly.
- lower the gain, for example switch to the low conversion gain section (0-119)
In any case keeping a minimum exp of 60s won’t do any damage