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ASA Rating of 250D (Indoors, CTBd Incandescent)


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#1 Cory Zapatka

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Posted 12 April 2011 - 01:16 PM

If I am shooting with 250D and will be using daylight-corrected tungsten lights (Arris with CTB), does this affect the ASA at which I should meter?

Edited by Cory Zapatka, 12 April 2011 - 01:16 PM.

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#2 Adrian Sierkowski

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Posted 12 April 2011 - 01:57 PM

No. The EI of the stock (ASA/ISO) is always 250. The "change," you see marked on a can (64 in this case) is taking into account the light loss from an 80A Filter (2 stops) where you filtering on the camera. You, however, are filtering on your lights so there'd be no compensation for exposure on camera.
Also, even if you were using 250D inside w/o putting full CTB on your tungsten sources you'd still rate it, if you so choose, at 250 so long as there's no filter on the camera. Make sense?
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#3 Cory Zapatka

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Posted 12 April 2011 - 02:14 PM

No. The EI of the stock (ASA/ISO) is always 250. The "change," you see marked on a can (64 in this case) is taking into account the light loss from an 80A Filter (2 stops) where you filtering on the camera. You, however, are filtering on your lights so there'd be no compensation for exposure on camera.
Also, even if you were using 250D inside w/o putting full CTB on your tungsten sources you'd still rate it, if you so choose, at 250 so long as there's no filter on the camera. Make sense?


Makes complete sense. I had a hunch that Kodak was just lending a hand in compensating for the filter, but I just wanted to make sure. Thank you! 250 it is.
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