PTG MODEL I Pinhole Camera
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Remember the days, when you were constructing a Camera from an Oatmeal box, or Tin can? It worked Oh yes.... During the time I saw many Pinhole cameras made by third parties, which were more sturdy and easier to work with due the ability to use Sheetfilm holders or Polaroid backs. As I am always on the outlook and so to speak on the edge for nice designs and construction, there must come a moment that I will find it...
4x5 Pinhole/Zone Plate Camera Model I
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 Model I Front & rear view... |
THE CAMERA
Photo Technical group Pinhole/Zoneplate cameras are designed specifically for photographers who
wish to explore the world of lens-less photography using a camera
that can be counted on for consistent results.
The cameras are handmade, using the finest native hardwoods. Metal parts are machined from high-grade aluminium,
then hard anodized. After completion, each camera is thoroughly tested with film.
Test negatives are provided with every camera sold.
The net result is a qulity photographic instrument that produces exeptional images while providing years
of trouble free service.
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 Box joint |
 Int. SpringBack |
 Controls |
 Frontview Controls |
 Frontview Controls |
Looking at a couple of more modifications for the camera including a wider opening back to accommodate the Calumet C2 rollfilm back and a slot for gelatine filters. Testing out these features now. |
 Model I modified! |
Modifications for the camera including a wider opening back, filterholder, shutterknobhandle updated in the latest model PTG Model MKI1 ? My view? really tantalizing...! |
 Horseman meter |
 Sinar meter |
 Pol 545 Pro |
 Docs & Test neg. |
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Using the Exposure Calculator Most light meters do not support apertures as small as f-512 or f-128. The exposure calculator allows you to convert conventional readings to the smaller apertures required for the Model I cameras. Using the calculator is simple: Assume your meter reads f-22 at 1/60th. Trace the green highlighted row from f-22 to the column labeled 1/60th. Trace down the green highlighted column untill you reach the yellow highlighted rows (f-128 f-512) The converted exposure for f-128 (Zoneplate) is 1/2 second. The converted exposure for f-512 (Pinhole) is 8 seconds. |
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 | The back of the Photo Technical Group Model I accomodates all available Polaroid 545 holders. Of course all types of sheet film holders. In short all holders/cassettes with the thickness of a normal 4x5 Filmholder will be accepted Even a Sinar Six or Horseman exposure computer will fit perfect, but you have to make tests if they are usable at these apertures! |
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