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Archive for April 3rd, 2014

Long-duration Exposure: Neutral Density Filters vs. Color Shift

The view through the front window (1950-vintage glass + storm window) at 1/500 s, f/4, ISO 100, auto-exposed to EV 0:

Front yard - normal exposure

Front yard – normal exposure

The same view, using stacked 2 + 4 + 8 ND filters, at 1/3 s, f/4, ISO 100, auto-exposed to EV 0:

Front yard - ND2-4-8 filters

Front yard – ND2-4-8 filters

That blur to the left of the mailbox is a passing car, which is the whole point of heavy ND filtering: you can use absurdly long shutter times and still get a decent exposure.

I cannot explain the fact that the ND filters allegedly reduce the light by 14 stops, but the actual (auto) exposure increases by about 7 stops. They’re cheap non-coated K&F Concept Digital filters, of course, but …

There’s an obvious color shift toward red / magenta.

This is a placeholder so I can pick up the thought later on…

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