Archived posting to the Leica Users Group, 2006/04/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Actually you have to consider the reciprocity failure of the film. Sensitivity gets non-linear at long exposures. Mike D Don Dory wrote: > Eric, > Exposure would be the easy part. Just for example you get a base reading > of > 1 sec at the given aperture. A ten stop filter would get you to 16 > minutes. Stack another ten stop filter and you get about 33 hours. At > this > point minor timing changes will not have a serious effect as you would have > to double or quadruple the exposure due to reciprocity failure. > > So, I would start with a slow film, a small aperture, and your 10 stop > filter and bracket at 10, 20, 40, and 80 minutes. Bring a good book or > another camera and enjoy the time. > > Don > don.dory@gmail.com > > > On 4/16/06, Eric Korenman <faneuil@gmail.com> wrote: > >>Can't remember his name. Wish I could provide a link to images. >>I thought about stacking filters and a pinhole too, but how to even begin >>to >>roughly calculate the exposure time?! Any gear heads out there to run the >>math? >> >>Darkest filter I've got is a 10 stop filter. >> >>Eric >> >> >>On 4/16/06, Don Dory <don.dory@gmail.com> wrote: >> >>>Eric, >>>So, where do I see the images? At the last LUGfest in NYC now more than >> >>a >> >>>few years ago I saw the camera that he was using at MOMA and always >> >>wanted >> >>>to see the results. >>> >>>My guess would be a large format film with a very dark ND filter and a >>>near >>>pinhole aperture. I think that you could stack several ND filters as >> >>the >> >>>effect would be a geometric series. F256 on a 50 ISO film with a sixty >>>stop >>>effective filter would get you into a pretty long exposure. Figure out >> >>an >> >>>extreme compensating developer and Pat's the bunny. >>> >>>Don >>>don.dory@gmail.com >>> >>> >>>On 4/16/06, Eric Korenman <faneuil@gmail.com> wrote: >>> >>>>There is a photographer out there who works in u-l-t-r-a long >> >>exposures. >> >>>I >>> >>>>mean on the order of months to years. >>>>He documented the building of the new MOMA in NYC. >>>>They are quite amazing images. >>>> >>>>In short - HOW do you do that? >>>>IE How do I do that?? >>>> >>>>Eric >>>> >>>>_______________________________________________ >>>>Leica Users Group. >>>>See http://leica-users.org/mailman/listinfo/lug for more information >>>> >>> >>>_______________________________________________ >>>Leica Users Group. >>>See http://leica-users.org/mailman/listinfo/lug for more information >>> >> >>_______________________________________________ >>Leica Users Group. >>See http://leica-users.org/mailman/listinfo/lug for more information >> > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >