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Long exposure / grey card

  • 04-12-2012 11:37am
    #1
    OldGoat
    Registered Users, Registered Users 2 Posts: 12,637 ✭✭✭✭


    I acquired some sheets of welding glass plate and am about to faf around with some very long exposures, for shiz and giggles. I know the colour cast is going to be from hell and so I'm going to shoot a grey card first to help with the while balance in post.

    What I want to know first is if I need to expose the grey card for the same length of time that I'll be taking the actual shot at - or can I shorten the exposure time just for the grey card by increasing the ISO and opening up the aperture? Once I do it stop for stop (the reciprocity thingy) so that the exposure remains the same can I shorten the length of exposure just for the grey card and then go back to a much longer exposure for the actual shot?

    Just typing that out clarified my thoughts. Exposure is exposure is exposure. Once the 3 variables add up to the same exposure then the grey card will always be the same. I can tweek the aperture, shutter speed and ISO to my hearts content and as long as I maintain the same exposure.
    Right?

    I'm older than Minecraft goats.



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