Archived posting to the Leica Users Group, 2006/04/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]here is a link to an example. the artist is Michael Wesely http://www.artnews.info/gallery.php?i=373&exi=1266 Eric On 4/16/06, Mike Durling <durling@cox.net> wrote: > > 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 > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >