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Old September 18th, 2014, 10:47 AM   #1
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Waveform and gain doubt

Hola guys, i have a question for you:

how do the waveform work exactly to avoid overexposure? The white stuff shoukd stay between the 2 big rectangles (on a total of four rectangles) right?

Othe question:
the gain should not be less than 400 iso right?
Thank you so much
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Old September 21st, 2014, 10:55 AM   #2
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Re: Waveform and gain doubt

que tal Marcus

The waveform will show exposure levels across the frame ranging from superb lack to superwhite. In the AF100's WFM, there are a series of dotted horizontal lines and solid horizontal lines... the solid lines represent, from top to bottom, 100%, 50%, and 0% IRE. Ideally white would be at 100% IRE, black at 0% (or usually 7.5%IRE).

Simply enough, just keep the levels from going above 100% to prevent overexposure. Conversely if you want a sold white background and want to be sure you have a solid white background, then adjust exposure and lighting on your background until you have a solid line at 100%. If you want your subject to fall in the ~50% IRE region, then watch for its signature in that range of the WFM.

Here's a video that explains WFMs in general pretty well:

Hope this helps


As to gain, on the AF100 I think 400 is ideal and 800 is still good. Depending on the scene file, 1600 and 2500 are still workable, 3200 is OK but starts to get messy.
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Old September 22nd, 2014, 12:46 PM   #3
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Re: Waveform and gain doubt

Thank you kevin!
I really appreciate your post!
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