Hello! 

I'm planning our live webstream of the eclipse in full-disk white light and full-disk hydrogen alpha, from Bloomington IN (4 min of totality!) 

My white light scope is a ZS61, 0.8x reduced, with an asi585mc camera that I'll crop to 2160x2160.

I have the settings pretty well optimized to capture 1000+ frames every 30 seconds via firecapture, with sharp details on sunspots etc. The 1000-1200 frame SER videos stack quite nicely. 

Supposing I have those settings with the solar filter dialed in (reasonable gain and exposure time), is there an easy way to estimate the change in exposure time to clearly image the corona when I take the filter off for totality? 

Of course, nothing to change on the hydrogen-alpha scope (Lunt 60MT): just keep it rolling to hopefully get some prominences past the lunar disk during totality. :-) 

Thanks!
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