On Feb 9, 2011, at 10:18 PM, Paul Stenquist wrote: > > On Feb 9, 2011, at 10:05 PM, Walter Gilbert wrote: > >> Thanks for the explanation, Collin. >> >> When Paul said to overexpose, I was actually thinking it sounded >> counter-intuitive -- that you'd want to under-expose in a snowy situation. >> But, it makes sense now that you explained that the meter "assumes" a >> neutral grey. >> >> So, I'm assuming that in extra-low-light situations, I'd want to >> under-expose by a couple of stops in that case. > > No. It's not amount the amount of light. The reason you overexpose snow or > anything else that fills your frame with white is simply because it's white > and very reflective. Like Collin said, the meter assumes everything is 18% > gray and reflects the amount of light that an 18% gray surface would reflect. > So shooting a white subject in low light, you would still overexpose. > Shooting something totally black, you would want to underexpose by about one > stop, since black doesn't reflect much light.. Again, using the gray card and > exposing to the meter reading is usually better in really tricky lighting > situations. Another alternative is an incident meter, which measures the > light source rather than the scene. As with the gray card, you don't have to > correct for the reflectivity of the subject when shooting with an incident > meter. > Paul ARRGH! That should have read "It's not about the amount of light" >> >> Glad I found this out before getting too deep into the roll! >> >> -- Walt >> >> On 2/9/2011 8:40 PM, Collin Brendemuehl wrote: >>> No!!! Always overexpose snow by 2 stops. >>> >>> Why? >>> Because an averaging meter expects a mid-gray tone. >>> The result will be gray snow unless you open it up, >>> either with the shutter, aperture, or both. >>> You can also change to iso32. >>> >>> >>> Sincerely, >>> >>> Collin Brendemuehl >>> http://kerygmainstitute.org >>> >>> "He is no fool who gives what he cannot keep to gain what he cannot lose" >>> -- Jim Elliott >> >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions.
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