I'd tried to get the "wood" effect by exposing at ISO 25 , then 12 and 6 , still no glow . This was all
done during nice bright days , by ISO 3 , the effect was suddenly what I was hoping for . I didn't go
any lower . I'll see if I can find the pics ( hard drive crash , means a lot of searching through old negatives .
Peter
ps; these iso sttings were taken with a little Sekonic Twinmate meter