Tag: focus

Depth of Field Demonstration: On a Simulated Microscope

At higher magnifications, microscope lenses will only be able to focus on layers within your specimen. You could take a series of images with different focal planes and stack them together, but without a camera mounted on the microscope, getting images to line up right for focus stacking is quite the challenge. The alternative is focusing in and out until you get a feeling for the three dimensional shape of the specimen.

Since I don’t have a camera mount I’ve created an html5/javascript page that simulates focusing in and out of a sample. It’s embedded above, but a direct link is here.

You can use the knobs to the right of the image to adjust the focal plane. You should be able to see hairs on the top and bottom of the transparent wing.

Time to Focus: Using Earbuds in the Classroom

People need chunks of quiet time to get work done. Big cubicle farms with open office plans increase stress and don’t make for happy workers (Paul, 2012 summarizes). But, using earbuds might help people focus on the job at hand:

Although it might seem that importing one’s own noise wouldn’t be much of a solution — and although we don’t yet have research evidence on the use of private music in the office — experts say that this approach could be effective on at least one dimension. Part of the reason office noise reduces our motivation is that it’s a factor out of our control, so the act of asserting control over our aural environment may lead us to try harder at our jobs.

— Paul, A.M., 2012: Why the ‘Open’ Office Is a Hotbed of Stress in Time.

It has been my observation that the earbuds help a lot in helping students stay focused and on task. However, for the middle school students at least, I usually require them to to have preset play lists so they’re not distracted by skipping through songs every five minutes. I also recommend quieter music because it tends to be less distracting to the student, and there’s almost always someone who’s volume is so loud that everyone else in the, now very quiet, classroom can hear.

↬ Appel at The Dish.