[URL]http://www.geocities.com/thombell/dx.html#latitude[/URL] Shows the 'code' for the exposure latitude portion of the 135 format DX code. On a roll of Velvia, the most pesimistic case is selected by the code, eg, per the table in the link above +/- 1/2. Now the latitude of Velvia is at least two stops either way, possibly +/-2.5 ... So does the DX code for exposure latitude have an offset base? (eg: 1.5 or 2 would seem to make sense). eg does the +/- 1/2 really mean +2 +1/2 to -2 -1/2 (+2.5 to -2.5)? Or is the code really meant to drive the program exposure mode s/w with an idea of how loose or tight the s/w should interpret the scene? One tidbit I found via Google suggests it merely helps the camera in program mode to determine if it can keep the shutter fast enough to avoid camera shake and still get a reasonable exposure. In this case, only the under exp side would be needed, so seems like a partial response at best. All replies apreciated. Cheers, Alan.