13

Lighting and exposure for HD

13.1 Equivalent ASA speed or EI rating

I check the speed of a Panavized F900 in exactly the way I would when testing a film stock’s ASA or EI rating. Note that the numbers will be the same.

When checking a film stock’s ASA speed, I set the camera up facing an 18 per cent reflectance grey card and make a range of exposures, noting the setting on my meter for each one. Then I ask the laboratory to make me a middle of the range one light print. Whichever exposure most exactly matches the tonality of the original grey card I deem to be the correct rating for that particular film stock.

With any HD camera my approach is the same but the technique a little different. I set the 18 per cent grey card up as before and, ...

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