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What Is A Filter Factor?
I bought a few black and white filters a couple of days ago, and I was needing some help understanding the filter factor. I have a yellow K2 and an orange G filter. The K2 has a factor of two, while the G filter has a factor of 3. From what I gather, those 2 and 3x filter factors translates to a one stop and 1 2/3 stop difference, respectively. My question is, do I add or subtract that to the original exposure? Thanks.
2 Answers
- monophotoLv 71 decade ago
The 'filter factor' is a number that tells you how much additional exposure you must add when using a specific filter.
For example, if the filter factor is 2, then you need to add one additional stop of exposure. So, if you original exposure was f8 at 1/125, then a filter factor would cause you to have to expose at either:
f5.6 at 1/125 or
f8 at 1/60
- David MLv 71 decade ago
You will need to increase the length of your exposures or use a larger aperture to achieve the same exposure. These filters block some light from entering the camera so everything slows down a little.
