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Exposure questions and file size question

jmiguez

Lafayette, US
534 posts

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jmiguez Silver Member Nikonian since 17th Oct 2010
Fri 19-Nov-10 09:41 PM

In south Louisiana it is sugarcane harvesting time. While driving I noticed some harvesting off the road and stopped. I took out the D7000 with the 18-105 kit lens mounted, then proceeded to shoot eighty something pictures of the process.

I just got through reviewing the pictures and noticed that some images were light and some darker. After reviewing the camera data of the RAW (14 bit)files I have a couple questions.

I was shooting in Aperture Priority with the lens set at F8. Focus was set to AF-A, Auto, Matrix and AF Fine tune OFF. ISO was set to 3200 (From last night and I forgot to change it).

All of the shots were similar, in that it was an overcast day and I was following the progress of the combine and loading tractor as they slowly crossed in front of me. The shutter speed changes, which I would expect. However, it is the EV which puzzles me. It is all over the place. It varies from 0 to -2.0EV, which I assume explains the dark and light shots. My question is why? Why would the EV change? I thought the camera just changes the shutter speed? The shutter speed did go all the way to 1/8000 with a low of 1/2500. However, some of the -2.0 EV shots were at the lower range. I would have thought that at 1/8000 the EV would be in the negative range if the light was too bright? Yet, some of the 1/8000 and -2.0 EV shots are the darker ones? wouldn't they be lighter?

My other question is the file size. It ranges from 20.6 MB to 24 MB. Why does this change?

I can see I have a lot to learn with this camera.

John

My Pictures may be seen here: http://jmiguez.smugmug.com/

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