On Monday, February 18, 2002, at 03:23 PM, Bill Owens wrote: > I think there is a problem with the ME and MES. Using just the orange > filter, the TTL metering in my MES (which I THINK is fixed) shows a 1 > stop > correction. The data sheet shows 2 1/3 stops correction. This > morning I > shot a roll of FP4 (ISO 125) in my Yashica Mat, using a Minolta IIIF > incident meter at ISO 25 and the negatives appear perfect. Using the > MES in > TTL would have underexposed by 1 1/3 stops.
Your meter is right on, don't worry. This is what we were talking about -- black and white film is not sensitive to all colours of light in exactly the same way. The redder the light, the more exposure the film requires to make a proper exposure. If you had colour film in your camera, your ME's meter would have given you perfectly exposed negs. However, the b&w film needs that extra 1 1/3 stop because of the colour of the filter. The rest of the exposure difference is due to the filter's density. -Aaron - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
