Science Buddies: "Ask an Expert"

Hi there!
So, I have picked this experiment for my science project and cannot change it. I am getting worried though because I have a Nikon D3300 with a 18-55 mm lens. The widest aperture I can get is f/3.5 but it says I need f/2.8. Would it be okay to use that aperture, would the experiment still work. Also, can I take the night pictures before the calibration?
Thank you!

Hello paulanordstrom,

I'm assuming that you're working on the project described here:

https://www.sciencebuddies.org/science- ... p022.shtml

Yes, the experiment will work with your f/3.5 aperture. With your lens the maximum aperture is f/3.5 at the 18 mm focal length. The aperture is reduced when the lens is zoomed out to longer focal lengths. My suggestion is keep the lens at the 18 mm setting throughout the experiment.

I think it’s OK to take the night pictures before the calibration step. Just be sure to keep the same lens and ISO settings for both the night pictures and the calibration.

I hope this helps. Please ask again if you have more questions.

A. Norman