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- Jul 26, 2015
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Thanks William.Seems like others have given you alot of great reading and info. It 'll all come together.
In case you haven't found the answer to your question of adjusting exposure,
ISO is the sensitivity to light, a change of doubling or halving is considered 1 "stop " higher number is more sensitive to light
Shutter speed is how long of time light is let in for each frame again doubling or halving = 1 stop
Nd filters reduce the amount , ND2 cuts light 1 stop,ND4 2 stops, ND8 3 stops ND16 4 stops
So changing ISO 800 by half=ISO400, 1 stop.... ISO 400 by half=ISO200 1 more stop ISO 200 by half=ISO100 ( our target) 1 more stop again.Total 3 stops down
So change shutter from 1/800 by double =1/400 1stop by double =1/200 1 more stop, by double 1/100 again 1 stop. Total 3 stops up. Remember ISO number down= less light in , Shutter longer time= more light in.
Hope this helps
@jack1144 - Thank you so much for the explanation. You, and others, have been tremendously helpful and I am so appreciative Just a quick question on the ND filters. You mentioned going to ISO 100 from ISO 800 and therefore it's 3 stops. I understand that ISO 100 is our goal, but is the 800 a rule of thumb or just for example purposes? I ask because I noticed you picked the shutter to also go from 800 down to 100, and was wondering if this was by coincidence, or if that was the rule of thumb. If you could please elaborate on this, I would really appreciate it.
Also, today I flew in sunny conditions and my ISO was at 800 and shutter was set to 500 (since I did not have an ND filter). I was shooting at 1080p 60fps. Based on this how would I pick my ND filter (2, 4, 8, etc?). I am trying to get a grasp of how to pick the right ND filter when I'm at the flying field. Again, much thanks for your help - Liked!
William