Photoshop Tutorial
Calibrating Your Camera
Verifying ISO
After you accurately tested the flash
output, set your camera to manual mode. Use a shutter speed of 1/125 and
the aperature to F8. Your cameras ISO should be at 100. Using your standard
lens take an image of the grey card. Make sure the greycard is full frame
(no other objects in the image). Now, in your camera, look at the histogram
of that image.
The histogram shows that the exposure
is to low. The peak should be in the
middle. So, we now set our flashmeter to ISO 80 and retake the image.
This histogram shows the peak in the
centre and is properly exposed. This
tells me to use ISO 80 in the studio with this lens.
So, what does this mean?
It means, I should set my flashmeter to ISO 80 and my camera to ISO 100
when I am shooting in this situation (studio, lens...) You should do this
test for other shooting scenarios like outside in shade or bright sun.
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