Also, the area around the heaters will be the only part that is really exposed, so if he sees decent detail in the negs about the heaters, he's got his exposure (of course anythign clear in the neg should wind up black).
If the neg isn't winding up black background, the printer has pushed the exposure automatically in a machine without looking. I've had people tell me that they couldn't do anything else (because they didn't know how to use the machine).
If that's the case, and the negs do look reasonable, he'll have to go to a pro printer to get them done.
If the negs are thin even in the part that is exposed, then he needs to worry about reciprocity, probably.
-- Do not seek the treasure! DO NOT SEEK THE TREASURE!
