From: Bernd Luetzeler (email suppressed)
Date: Tue Nov 02 2010 - 05:13:04 PDT
I have done a film with 2 minute exposures and I had to dim the incoming light by 13 stops.
therefore I sandwiched B&W ND Filter 103 and 110.
I haven't calculated it but maybe you can try to sandwich two 110 Filters to extend your exposure..
I also worked with Baader Solar Foil but I had really bad reflections with that.
Am 02.11.2010 um 17:10 schrieb Aditya Mandayam:
> Hello, I am interested in making extremely long exposures: of the
> order of many months, perhaps a few years.
> E.g: http://photoslaves.com/open-shutter-by-michael-wesely/
> I asked this question on photo.net as well:
> I would like to know how to meter for such long exposures. What amount
> of light does one assume? Average brightness of a day over a year?
> Thank you.
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