The Camera Obscura
The camera obscura means darkened chamber. In a dark room with a small hole in the wall, you will see an image on the opposite side and it will be seen upside down.
Iteams used to make my camera obscura
I decided to make a telephoto lens using the following materials:
First I cut two lengths of tube of different diameters so that one could fit inside the other. I placed a small piece of greaseproof paper across the end of the thinner tube and taped it to the sides securely. I then attached a small piece of tinfoil over the end of the wider tube, taped it to the sides securely and made a tiny pin hole in the tin foil. I moved the two tubes backwards and forwards. I noticed that the image got clearer and blurrier. |
Good things about the telephoto lens is that you have adjust how close to the object you want to be just like using a camera you are able to zoom-in and zoom-out. A problem I had was using the scellotape on the inner tube, the tape was quite thick so it made the outter tube harder to move backward and forwards. If I was to make an telephoto lens again I would either make the inner tube be an reasonable size that its more freely to move back and fort with scellotape on. |