Photography

A pinhole camera is a very simple camera with no lens and a single very small aperture. It is a light-proof box with a small hole in one side which light from the outside pases through onto photography paper.. We done this poking a small, pin hole in a box that we made light tight by painting the inside black and placing some photography paper inside, and sealing it tight. We put a small flap over the top of the pin hole, to prevent light entering the box when not needed.


This is a picture that shows the geomitry of a pin hole, we can see the f stop calculation.


After we had made the pinhole camera we worked out how long our exposure time was, and went out and shot what we thought would make a good photograph. We done this by exposing the photography paper to light for a certain amount of time (exposure time).

To calculate how long I needed to keep the flap of my camera open, I needed to calculate the Fstop.

Focal Length
------------- = Fstop
Aperture


90
------ = 112
0.8


This means that to take a picture on the inside of a building, depending on the light readings we took earlier on in the day I have to expose my photographic paper for 15 minutes

To take a picture on the inside I have to leave it out for 40 seconds.

After we had taken our photograph, we took our photographer paper into the dark room and put it through the developer and the stop. The Developer develops the picture and you have to leave it in there for around 1minuite, the stop stops the developing process and you leave it for around 30secs.


Evaluation.

The first few pictures i done came out all black, which means the photographic paper was exposed to light for too long.. after changing the exposure time i managed to get a couple of clear photographs. I think if i had time to do more shots they would of kept improving, and i would of been able to produce a wider range of pin hole camera photographs.