I am not sure what you are trying to accomplish, but if your tests tell you to rate Efk 25 at asa of 6, then stick with it. You are already 2 stops below what the manufacturer rates the film. What asa the manufacturer rates a film, is just a guide, a place to start.Originally Posted by noseoil
If that is what works for you, your personal asa, then stick with it. Use it and go out into the field and just take pictures, have fun, create. Keep records of your exposures based on asa 6, zone placements, filters, development times. Print what you like as expressively as possible. Then learn from your records what worked and what didn't and then go shoot some more.
I have not done a film speed/developmenmt test in years. From what I have read Bruce Barnbaum doesn't do them at all. He just shoots and makes adjustments as needed.