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I have a SONY NEX-5 and a Pentax *istD. I intend to use the Pentax for a widefield timelapse on automatic exposure and have the NEX-5 with a 200mm lens on a polarie with a manual remote to capture the corona at totality.[/QUOTE]
I suspect a time lapse on auto exposure will fail. That's because I find DSLRs don't auto expose to a wide enough exposure range for this sort of work.
For example from daylight to nightime transitions. I have done several now. I used aperture priority with an F2.8 lens and also set the camera to auto ISO with minimum and maximum ISO set.
This worked up to a certain point in the twilight and then it was inadequate at night as that would be ISO6400 and 30 seconds and no way will auto expose set the camera to do that. Aperture priority alone may not be enough and auto ISO is only a feature on a few cameras.
DSLRs are engineered mostly for daytime exposures and it shows in the settings available.
A test would be a time lapse from day to twilight levels matching expected light levels with the eclipse.
Greg.
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