View Full Version : ULF Pinhole Update
a few weeks ago i posted a question about building am 8x20 or 7x17 pinhole camera. just wanted to let you all know i appreciate your help when i asked about resources and coverage issues .. i will most likely be builidng something in a month or 2 when i find some extra time .. i am going with the idea of a large "tank" below the camera to put exposed film / paper, and some sort of a leaf spring/plate to hold the paper/film, and hold it flat ...it'll be like an oversize mandel-ette post card camera :) when it is made and i have some results from "the beast" i'll post some images online. thanks again & have a nice new year
Why not use photo paper and build a 20"x24" or large pinhole camera?. Why use expensive film when the resolution is limited by diffraction anyway. If you desire to have a transparent negative, which is not really necessary, coat the paper with Canada Balsam as it has the same index of refraction as paper.
what is canada balsam? you are right about using paper. i probably won't use anything fancier than good old rc or fiber paper :) thanks john
Ed Buffaloe
31-Dec-2001, 10:00
Perhaps the main problem you will encounter in making a panoramic pinhole camera is the light falloff at the far ends of the negative. This could be alleviated by having a curved film plane, which would make the "focal length" the same, at least in the horizontal plane. Of course, then the camera would be a bit unwieldy.
thanks for your suggestions ed :) if my flat exposure-plane gets too much fall-off i'll modify the camera to use a curved one. i am going to be building a 1/2 scale 4x10 camera in the next few weeks and i'll see how things go. from what i understand if my pinhole shim is thin enough and i allow for enough of an image circle i should be okay .. but i'll post my results just the same ! bye for now john
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