Pinhole Polaroid Cameras

A pinhole camera is a camera that has a tiny hole instead of a lens.
More infos about pinhole cameras are here and here
With the right dimensions those cameras can give surprisingly good pictures.
Converting a Polaroid camera into a pinhole camera has some advantages over conventional cameras using negative film:

The instant image allows to correct for errors without having to go back to the darkroom for processing.
The 3000 ASA B/W packfilm shortens the exposure times considerably.
Color photos are as easy to make as B/W ones.
Polaroid packfilm cameras are very cheap and easy to find (the plastic ones will do).

I removed the lens/shutter assembly from a Polaroid/Tektronix C30 Oscilloscope camera and put a 0.4 mm pinhole in its place. Pinholes are very difficult to make yourself.
I used one from Edmund Scientific.

Here is a picture of it:
My pinhole-camera

Here are my first results:
pinhole picture #1
My Desk. Exposure time 15 sec. on 3000 ASA film. Hole dia. 0.4 mm f=70 mm
The sharpness of the picture is comparable to cheap point and shoot cameras.
The windows show the pincushion distortion typical for a pinhole camera fith a flat film plane.

pinhole picture #2
My Desk. Exposure time 15 sec. on 3000 ASA film. Hole dia. 0.4 mm f=70 mm
Note the incredible depth of field

pinhole picture #3
Cellar Laboratory. Exposure time 10 min. on 3000 ASA film. Hole dia. 0.4 mm f=110 mm

pinhole picture #4
View out of my window Polacolor Studio film. 100 ASA Hole dia. 0.4 mm f=100 mm
This is the color corrected version.

pinhole picture #4
The original Picture looks like this.
The greenish color may have something to do with the long exposure time.
The same film in a lens camera gives good colors.

pinhole picture #5
Test with artificial light
Light source is a 500W halogen floodlight in 40 cm distance.
Polacolor Studio film. 100 ASA Hole dia. 0.4 mm f=100 mm t= 20 sec.

pinhole picture #6
Test with artificial light
Light source is a 500W halogen floodlight in 40 cm distance.
Here I used a bluish filter to compensate for the lew color temperature.
Polacolor Studio film. 100 ASA Hole dia. 0.4 mm f=100 mm t= 90 sec.

Next I'd like to experiment with different hole diameters.
I would also like to build an integral film pinhole camera out of an old Pronto or 600 camera.