Stephen, If I run Efke 25 at asa 6 and place shadow values at zone 4, where am I with respect to film speed? Since I am already giving 4x more light than is "standard" with this film by way of speed, are you suggesting that I am giving the film an actual rating of 25, then overexposing by 4 stops, or a 16 fold increase in light?

Seeking a clarification here, as I really don't understand why setting the meter at asa 6 is not a film speed setting of 6. If I run all of my exposures at that setting and then place shadows where I deem fit and develop for highlights, isn't this an accurate representation of film speed? Need a little help here, please, as I must admit that I have been known to set the meter at asa 3 when doing N- at times.