F Stops

Started Aug 11, 2012 | Discussions thread
dosdan Regular Member • Posts: 499
Re: Um, no.

Joyless wrote:

If I for instance use iso 200, f/2.8, 1/2.5s I get LV 3.3 and a decent image for these conditions. If I put on a 9 stop filter and keep the camera settings, I still get LV 3.3, but a black frame.

LV units are stops. With your 9-stops ND filter (that's an ND512 filter; if it's ND400 it's 8.67 stops), to get the same exposure, as at LV 3.3, you would need to be shooting in a LV situation of LV 3.3 + 9 stops = LV 12.3. The Exif data in the camera is not aware by what means you have reduced the light level. It does not know you have placed a ND512 filter on the front of the camera. That's why you have to manually add it to the Exif-derived LV.


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