#3. "RE: D800 ISO 0.3 & 0.7" In response to Reply # 0 Mon 09-Apr-12 11:15 PM by MotoMannequin
Livermore, CA, US
You can think of these as 1/3 & 2/3 stops, and apply them to your photography without knowing more than that e.g. Increasing ISO from 6400 to Hi0.3 will allow you to increase shutter or stop down aperture 1/3 stop (1 click of the wheel if you're set to change in 1/3 stop increments).
Mathematically you can calculate this by simply Max ISO x 2^number of stops.
ISO 6400 * 2^1 (Hi1) = ISO 12800 ISO 6400 * 2^2 (Hi2) = ISO 25600
Assuming "0.3" is rounded from 1/3 and "0.7" is rounded from 2/3...
ISO 6400 * 2^(1/3) (Hi0.3) = ISO 8063 ISO 6400 * 2^(2/3) (Hi0.7) = ISO 10159 ISO 6400 * 2^(3/3) (Hi1.0) = ISO 12800 ISO 6400 * 2^(4/3) (Hi1.3) = ISO 16127 ISO 6400 * 2^(5/3) (Hi1.7) = ISO 20319 ISO 6400 * 2^(6/3) (Hi2.0) = ISO 25600
...much easier to think of these in stops and adjust shutter/aperture accordingly, then to try to calc, no? (unless you have Excel handy)
BTW I can't think of a much better day than shooting in a Redwood forest on a cloudy day!
#4. "RE: D800 ISO 0.3 & 0.7" In response to Reply # 3 Tue 10-Apr-12 06:55 AM by RRRoger
Monterey Bay, US
> >BTW I can't think of a much better day than shooting in a >Redwood forest on a cloudy day! >Quote<<<
Yes there is a better situation and this shooting in a cool Redwood Forest on a hot day. And a worst situation is one We face at an Equestrian Event: inside a poorly lit barn that is open around the bottom. The horses are too dark and the background to bright. You have to be very careful not to just end up with silhouettes.
Here is the picture I just took at Hi2 or 25600 ISO resized and saved at 82%