Back to pinhole, briefly.
The first thing would be to see if you can turn the room into a Camera Obscura. If your students are apt enough, get them to cover the windows with black paper. Make a hole 1 inch in the paper and bingo, the whole outside world will rush through it and will cover every bit of surface it can find. All this in color (why should it be black&white?). Of course, you have to wait a bit to let your eyes get accustomed. Have the students hold large pieces of white board and have them move around in the room. The image will always be in focus.
On bodycaps. The others have covered the front pretty well, except for the question of finding the proper exposure time. Exposure will be in the range of 1 sec to 30 sec, depending on light and ISO sensitivity since effective aperture of the pinhole will be constant in the F/100 or above.
The way I go is to set my camera at the highest ISO possible. Then on Manual, I experiment with different exposure times until I have the right exposure.
Expect the picture to be anywhere between soft focus to very blurry... Try landscape or portrait. Fun!
Expect the picture to be anywhere between soft focus to very blurry... Try landscape or portrait. Fun!
G.
Web: www.guyglorieux.com
On Mon, Jan 19, 2015 at 2:37 AM, karl shah-jenner <shahjen@xxxxxxxxxxxx> wrote:
stereo photos
no fancy equipment, just have them snap a shot while leaning to the left then rock to the right and snap another keeping the subject in the center of the frame - once in front of a computer they can learn to fine rotate the images to correct for any horizontal rotation. (if on a win PC, Irfanview does this very quickly). Then they can resize to a about 600 pixels wide (depending on the screen res) place the left photo on the right, right on the left, cross their eyes and see the image in 3D. They'll also learn the 'rule' about interoccular distance is rubbish and the wider the shots are taken, the more immersive the 3D effect will be. Wide angles are particularly good for this.
for those who cannot cross their eyes, that might be another lesson ;)
It's quite a feeling of success to make a nice 3D image and brings greater depth to photography. And they'll also learn another thing - often people new to photography will make the mistake of seeing a feature of a scene and photographing it with their minds eye view, later finding that bird or flower is tiny in the image, they not having moved in more or chosen a longer lens to render their subject as the main body of the image. When they do a 3D rendering they will find this 'mistake' is less so as their brain kicks in and again establishes a priority, enlarging the subject and brings it to the fore - then comparing the 2D and 3D images (uncrossed eyes V crossed) they'll understand better how the brain can get in the way of recording an image well.
please don't beat the students if they cock it up.. I know the temptation is sometimes strong, but it costs too much in tissues and soundproofing.
k
