> > When used to indicate a light level, EV usually assumes ISO 100. When you > > determine camera settings, however, you need to adjust for ISO. With a > > lighting level of "EV 10 with ISO 100," you'd use settings of EV 10 (1/125 > > @ f/2.8) with an ISO 100 imager, but settings of EV 12 (1/500 @ f/2.8) with > > an ISO 400 imager. So in this sense, the change in EV is linear with ISO speed. > > This statement sounds contradictory to the > equation introduced earlier (remember that > you said manufacturers assume ISO 100.
I read the original statement again, while it may seem a bit misleading, I understand it now. Here's a little table I use to "translate" EV to camera settings: EV in secs at ISO 100 --------------------- f/stop 1.0 1.4 2.0 2.8 4.0 5.6 8 11 22 32 64 128 ------------------------------------------------------------------ EV-5 30" EV-4 15" 30" EV-3 8" 15" 30" EV-2 4" 8" 15" 30" EV-1 2" 4" 8" 15" 30" EV0 1" 2" 4" 8" 15" 30" EV1 2 1" 2" 4" 8" 15" 30" EV2 4 2 1" 2" 4" 8" 15" 30" EV3 8 4 2 1" 2" 4" 8" 15" 30" EV4 15 8 4 2 1" 2" 4" 8" 15" 30" EV5 30 15 8 4 2 1" 2" 4" 8" 15" 30" EV6 60 30 15 8 4 2 1" 2" 4" 8" 15" 30" EV7 125 60 30 15 8 4 2 1" 2" 4" 8" 15" EV8 250 125 60 30 15 8 4 2 1" 2" 4" 8" EV9 500 250 125 60 30 15 8 4 2 1" 2" 4" EV10 1000 500 250 125 60 30 15 8 4 2 1" 2" EV11 2000 1000 500 250 125 60 30 15 8 4 2 1 EV12 4000 2000 1000 500 250 125 60 30 15 8 4 2 EV13 4000 2000 1000 500 250 125 60 30 15 8 4 EV14 4000 2000 1000 500 250 125 60 30 15 8 EV15 4000 2000 1000 500 250 125 60 30 15 EV16 4000 2000 1000 500 250 125 60 30 EV17 4000 2000 1000 500 250 125 60 EV18 4000 2000 1000 500 250 125 EV19 4000 2000 1000 500 250 EV20 4000 2000 1000 500 EV21 4000 2000 1000 EV22 4000 2000 EV23 4000 For other ISO speeds simply shift the left column up (slower speed) or down (faster speed) at one row per f/stop difference in speed. Of course, this table doesn't consider reciprocity failure. Lars -- .~. Lars Michael /V\ [EMAIL PROTECTED] /(_)\ http://www.larsmichael.com/ ^^ ^^ * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
