Great! Hey, could you guys snap a few lens pics, which you could upload, which would show us your "camera", being setup? I would be as interested in that, as the final result!
Good luck! Jeff On Saturday 27 April 2002 10:52 am, Guy Glorieux wrote: > Hi friends, > > I thought that some of you might be interested in an update on our > project to turn a room of the Wyndham hotel in Montreal into a giant > pinhole camera and to do a wall size pinhole image of the Montreal > landscape. > > Things are going on as well as could be at this stage and the only dark > spot I see is that the weathermen are calling for rain on Sunday, which > could play some tricks on us if the window is dripping with rain all day > long. As the rain interferes with light flowing through the pinhole, > there is no way to anticigarette how the image will ultimately shape up > on the emulsion. To make things more difficult, low light levels > associated with rain may require inordinate exposure times because paper > has huge reciprocity errors beyond 60 minutes exposure times. At 60 > minutes, the reciprocity correction factor is 9.5 for a corrected > exposure time of 9 1/2 hrs... > > We'll be using 3 strips of 50'' x 98'' to make the print (it'll be paper > negative which will be subsequently contact printed into a paper > positive). The paper will be tacked on a frame 150'' x 98'' held > vertical with two autopoles. > > To get the maximum view of the cityscape, we'll be working with a very > short focal length (so to speak for those not accustomed to large > format). The focal length will be somewhere between 36'' and 48'', to > be finalized on site. Optimum pinhole size for a 36'' focal is 1.27 mm > which gives us an F/stop of F/720. This is quite manageable on a bright > sunny day (6 1/2 minutes, uncorrected for reciprocity), but on a rainy > day, this could well rise to 2hrs. Add reciprocity, the theoretical > exposure time jumps to 26hrs... -:( > > The shutter will be opened at exactly 00:00hr on Sunday, April 28, to > celebrate the 2nd Worldwide Pinhole Photography Day and we will let > exposure run until Midnight exactly. It'll be a 24hr exposure, but my > tests in the past few days indicate that not much of the night time > exposure will show up on paper (unless we were to use a larger pinhole > for night time). > > The plan is to have a bunch of 8x10 sheets attached to the side of the > frame and to process one every hour or so to check how the image build > up and to modulate exposure as the image builds up until completion. On > a bright sunny day, this should occur around noon time, but if it's > rainy, we may barely have enough of the whole day. > > We'll be spending most of the day today setting up the room, the pinhole > and the wood frame and we should be ready well in time for 00:00hr > tonight. Exposure will take place all day Sunday and we'll start > processing the long strips of paper Monday evening and continuing the > subsequent two evenings. We'll use large 50'' x 10" tanks made from > boxes used to store rolls of photographic paper, lined up with heavy > plastic. The tricky part will be the washing stage, to ensure > satisfactory washing. > > We'll that's it folks. I hear that the team doing the Great Wall of > China giant pinhole will have something like 130 people. Hmmm... A lot > more than the five of us in this project! -:)) > > If you want more information, go to > http://www.zeroimage.com/Guy/PinholeHotel.html > or check the reference on the site of Pinhole Visions at > http://www.???????/ > > Happy pinhole day to all, > > Guy > > > > _______________________________________________ > Post to the list as PLAIN TEXT only - no HTML > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/
