Pinhole photography

This week after learning lots about photography and how the cameras work Tim, said we were going to take pictures with a pin hole camera. Not a really old camera but one that we were going to make ourselves.

To do this we needed:
- A box or tin
- Black Paint
- Foil
- Gaffa tape
- Masking tape
- A bit of cardboard
- Pin
- Photographic paper

I choose to use a shoe box because they are quite big and easier to make holes on them. First I got my box and then painted the inside black. Then made a hole on the box to put a bit of foil that was going to work as a lens and used the pin to make a hole on it' then with the bit of cardboard we stuck in on top of the lens and that was our shutter. We then went to the dark room and put photographic paper inside it and closed the box and shutter. After all this we finally had our pinhole camera done.
we then have to measure the distance from the pin hole to the bottom of the box, it's called the focal lenght. The focal lenght on my camera was 92.

How exactly does the pinhole camera work?

A pinhole camera works by just liek the other cameras. It capetures the light coming from objects and putting it onto a photographic paper. Because it's not like one of the recent cameras where we push a button and in a second we have an image we need to leave the camera pointing at what we want on the picture for quite a long time.
The time depends on the F-stop, to find each camera's f-stop we need to do a calculation:

Fs = Focal Lenght = 92 = 115 The F-stop is 115.
Diametre of pinhole 0.8

Then, depending on the light reading of the day we calculate the ammount of time that we need to open the shutter for so we get the light onto the photographic film.

Cause I wasn't sure how to do that i asked Tim for an estimate of the time i needed.

Outside: 45 seconds
Inside: 12 minutes

After spending the time needed with the shutter opened, we were meant to take the camera to the black room so we could get our negatives. Depending on how it looked like we'd know if we needed to expose the photographic film more or less time.