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Calibration Steps in Skyglow Experiment
Moderators: AmyCowen, kgudger, bfinio, MadelineB, Moderators
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StudyFalcon
- Posts: 2
- Joined: Mon Oct 24, 2011 4:01 am
- Occupation: Student: 8th grade
- Project Question: Why do we need to complete the callibration steps (Steps 1-4) in the "Using a Digital Camera to Measure Skyglow" project? What is a logarithmic scale?
- Project Due Date: November 2, 2011
- Project Status: I am conducting my research
Calibration Steps in Skyglow Experiment
What is the reason for the calibration steps in this experiment? - https://www.sciencebuddies.org/science- ... p022.shtml
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kgudger
- Moderator
- Posts: 421
- Joined: Wed Sep 17, 2008 9:20 pm
- Occupation: electronic engineer
- Project Question: n/a
- Project Due Date: n/a
- Project Status: Not applicable
Re: Calibration Steps in Skyglow Experiment
Hello and welcome to the forum!
From what I can gather from the experiment, the calibration step is to give you a range for comparison. As the experiment says:
Keith
From what I can gather from the experiment, the calibration step is to give you a range for comparison. As the experiment says:
You can use the relative information to compare skyglow in different directions and different places with your reference. If you want to know the actual light levels, you'll have to further calibrate your camera per the article.The gray scale calibration covered in this project established the dynamic range for your digital camera. However, you still don't know where that dynamic range falls in terms of absolute light levels. The Sky & Telescope article by Tony Flanders describes a method for calibrating the camera using photographs of stars of known magnitudes (Flanders, 2006).
Keith