Folks, I stopped down to f45 for depth of field on a close subject on a flat-light, overcast day, and after adding exposure for the bellows extension, found myself looking at 4 minutes (when overcast) or 80 seconds when sunny.

Then I recalled that my table for reciprocity failure adjustments from Howard Bond is vintage 2003, but the 'new' 400Tmax data sheets are late 2007, and was first sold in early 2008.

So, I ask, should I use Howard's data?

Thanks for the help!!