Snapping Depth

Overview

Objectives/Goals The objective of the experiment was to test and analyze the answer of the cause and effect question: How does changing the amount of light a 35 mm SLR camera takes in affect the clarity of the depth of a picture shot using a high shutter speed? It was expected that the trials with the additional light would have a higher overall depth of field. Methods/Materials The five different trial sets were 100% flash power (control), 50% flash power (variation one), 25% flash power (variation two), 12.5% flash power (variation three), and finally, 6.25% flash power (variation four). Ten different pictures were taken for each of the different trial sets- five with the Fresnel lens and five without. Each picture was shot at relatively the same time (3:45 p.m.). They were shot indoors, where the shut blinds created a dim room. The subject of the pictures was a regular measuring tape. At the end of the picture taking, the clarity was measured and inputted into data tables. Results The trials with the Fresnel lens had a higher depth of field than the ones without. Additionally, it was found that the 50% flash power trials were the clearest. Conclusions/Discussion In conclusion, the hypothesis was correct. The additional lighting did result in a higher depth of field. To go beyond photography, the Fresnel lens could be installed on a light bulb, therefore increasing its output while maintaining the same power input. This creates a method that is environmentally beneficial.

Competition history

• CSEF 2014 Physics & Astronomy · Entry J1804

Resources

• CSEF project summary ↗

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