It was an early Friday morning and the Cityplaza at Taikoo Shing was full of people preparing for the opening of the Innotech Month 2011, which marked the beginning of an array of activities organized by the Innovation and Technology Commission, with the Hong Kong Federation of Youth Groups and the Hong Kong Science and Technology Parks Corporation as campaign partners.
LEAD Centre took part in this exciting event by organizing a workshop about image forming box. Does it sound new to you? An image forming box is actually the antecedent of modern cameras, which captures light from the environment and projects images on a screen inside the box. While the introduction session of the workshop brought us back to the history of photography, our instructor Helen explained the components of image capturing and forming – light, and more importantly, a hole for light to pass and focus.
“Any clue on how a camera works? How was it first made?”
In these years when advanced photographic technology has become so popular, that for those who have grown up in the digital era seem to be unfamiliar with traditional methods of photo-taking. The teenagers who participated in the workshop were all surprised that can pictures can form on a piece of paper using simple craftwork. Following the introduction session was a hands-on building session where participants learnt to make their own image-forming boxes using cardboard paper and tools.
So how is the size of the hole related to the effects of the image? Basically the larger the hole is, the brighter the image would form. However things are not that perfect, as when more light enters the hole the more blurry the image will be. By the same token you may well expect that the smallest hole gives the dimmest but clearest image. Why is it so? Having such contradicting properties, how would you solve it?
The solution to the problem is, simply by attaching a convex lens to the hole. With the lens light becomes more focused and can form sharp images on the screen. Imagine a convex lens as a light-bending glass which allows light to enter while the direction of the light is controlled so they would not shine randomly on the screen which leads to blurry images, as well as giving it much brightness. Teenagers were fascinated by this effect and they were looking around with their new, improved image boxes.
The workshop was then visited by Legislative Council member Mr Wong Ting-kwong, the President of the Hong Kong Federation of Youth Groups, Dr Peter Tsoi, and the Commissioner for Innovation and Technology, Miss Janet Wong. They seemed to show great interests on the image-forming boxes too!
With some further efforts, the teenagers decorated their boxes into brilliant, eye-catching objects that even resemble the shape of real professional cameras! They all expressed delicate sense of creativity and skills to make their own ‘cameras’ unique and had shared their ideas with others.
Written by Solomon