How to make a Pin-hole Camera.

 This is an assignment that I did for my English Grammar Test. We were supposed to write a dialogue. My mom suggested this topic.

Write a conversation between two girls discussing how to make a pin-hole camera.

 Priya: Hi Riya! How are you? Did your science ma’m teach you the Lesson 11, Light Shadows and Reflection of our science book? Hi why are you so gloomy?

 Riya: Oh Priya! Yes our teacher has taught us this lesson…

 Priya: Really, isn’t it interesting?

 Riya: I didn’t find it interesting as I could not understand the concept of light. I mean that how it works and all about it. Oh! This lesson is very difficult.

 Priya: Well I can teach you how to make a simple pin-hole camera…….(bell rings)….. oh the break is over! You can come to my home in the evening and I will teach you how to make a simple pin-hole camera. Bye.

 Riya: Thank you so much, Priya. Bye.

                                              (In the evening)

Priya: Oh! You have arrived! Come, all the material is just ready.

 Riya: Thanks for helping me Priya. Is all this here for making the stupid camera? My God

 Priya: What? Oh, this? Yes all this will be used to make the camera. Well where was I Ahh! Yes!  Two cardboard boxes, scissors, tape, compass, tracing paper…………………. So now! Every thing is ready. Let us start.

 Riya: How are we going to make the camera with these things? I thought that some complicated stuffs are required to make a camera.

 Priya: Yes complicated stuffs are required to make a camera. But we are making a simple Pin- hole camera and not a simple camera.

Okay Let us now start:

So Riya You now cut out one of the side of the boxes and…..

 Riya: Me? Ohh! Priya I am not going to do this ……

 Priya: Oh you are doing this now cut it out. Yes like that. Press the scissor a bit harder. Yes. Now you see that one of the boxes is larger and the other is smaller and they both slide into each other without leaving any gap between them.

 Riya: Yes you are right.

 Priya: Now make a hole in the center of the larger box with the help of this compass. No, not here, it is not the center. Make the hole here. Yes. Now cut out a square from the center of the smaller box. Yes like that. Now tap this sheet of tracing paper on the square.

 Riya: Phew! How difficult it is! Now what do I have to do next “ma’am”?

 Priya: Oh! Don’t call me ma’am, Riya. It is now finished. Now just slide the smaller box into the larger one like that. Yes.

Now look at the screen though the open side at a stationery opaque object.

 Riya: Like this? Oh! I see an upside down image on the tracing paper! Its working!!!!!!  Thanks Priya for your help… Oh my goodness it’s fifteen to six! I must go home now. Bye Priya

 Priya: Bye Riya! But aren’t you taking your ‘stupid camera’?

Riya: Yes Priya. But it’s not ‘stupid’.



—–from How Stuff Works


 How does a pinhole camera work?

A pinhole camera is the simplest camera possible. It consists of a light-proof box, some sort of film and a pinhole. The pinhole is simply an extremely small hole like you would make with the tip of a pin in a piece of thick aluminum foil.

A pinhole camera works on a simple principle. Imagine you are inside a large, dark, room-sized box containing a pinhole. Imagine that outside the room is a friend with a flashlight, and he is shining the flashlight at different angles through the pinhole. When you look at the wall opposite the pinhole, what you will see is a small dot created by the flashlight’s beam shining through the pinhole. The small dot will move as your friend moves his flashlight. The smaller the pinhole (within limits), the smaller and sharper the point of light that the flashlight creates.

Now imagine that you take your large, dark, pinhole-equipped room outside and you point it at a nice landscape scene. When you look at the wall opposite the pinhole, what you will see is an inverted and reversed image of the scene outside. Each point in the scene emits light, and, just like the flashlight, the beam of light from that point passes through the pinhole and creates a point of light on the back wall. All of the points in the scene do that at the same time, so an entire image, in focus, is created on the back wall of the room. The image is very dim because the pinhole is so small, but you can see it if the room is very dark.

A pinhole camera is simply a smaller version of that room, and the film inside the camera replaces you. The film records the image that comes in through the pinhole. The camera records a nice, in-focus image of the scene that you point the camera at. Usually, you have to expose the film for a long time because the pinhole lets so little light through.

The pinhole in a pinhole camera acts as the lens. The pinhole forces every point emitting light in the scene to form a small point on the film, so the image is crisp. The reason a normal camera uses a lens rather than a pinhole is because the lens creates a much larger hole through which light can make it onto the film, meaning the film can be exposed faster.

See the next page for more information on using and building pinhole cameras.