Thursday, February 10, 2011

Exposure & White Balance with a Lastolite Ezybalance

Camera Decision
This shot used camera metering and Auto White Balance.
ISO 320, f/1.7, 1/160th
Here the white wall behind the apples fooled the meter, so the shot is underexposed.

Camera Decision Applied
I used the settings from the "default" shot.
ISO 320, f/1.7, 1/160th
When I put a grey card -- I used a Lastolite Ezybalance -- into the shot and used the same settings, I could clearly see this was an underexposed shot.

Metering from Lastolite Ezybalance
I set my white balance based on this card, and adjusted my exposure based on it as well.
ISO 320, f/1.7, 1/80th
Now I adjusted based on the reading with the grey card. It turned out I was one stop under, so I changed from 1/160th of a second shutter speed to 1/80th. I then used custom white balance based on this card.

Settings Applied
I kept the exposure settings and White Balance I had set with the card. The White Balance is 7000k and a +8 setting toward magenta.
ISO 320, f/1.7, 1/80th
This looks about the same way my eyes saw the scene. Great.

"Flash" WB
We can compare the WB with the camera's "Flash" white balance setting, which is 5500k and neutral between green and magenta.
ISO 320, f/1.7, 1/80th
This looks good as well -- though I do like the slightly warmer version I got basing my white balance on the grey card.

1 comment:

Philontilt said...

Cool post! Thanks, Ted.