how to simulate a "black hat"? - RAW Shooting and Processing - CHDK Forum

how to simulate a "black hat"?

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how to simulate a "black hat"?
« on: 20 / April / 2010, 17:18:38 »

i am experimenting with long exposures and would like to take the advantage of dark image subtraction - post-processed on a PC. unfortunately my sx120is has a self-retracting lens cover + no threads so i cannot really buy an adapter that would allow me to make a dark image (and holding lens covered for like 15 minutes seems really difficult). tried to cover a camera with a black t-shirt but the dark image was too bright.

do you have any tips/tricks how to achieve this goal?

thank you,



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