Harmon Direct Positive paper - reciprocity?

[Dakotah Jackson]

Another question on the paper. Anyone know about reciprocity compensation with longer exposures? Have checked on the Harmon site and did not find anything on it.

Have some inside locations with low light levels. Shooting will be 10 minutes and longer at the ISO of the paper. Will reprocity mean even longer exposures with the paper?

[rjbuzzclick]

You might want to bracket just to be safe, but at those exposure times you could be there all day. Here's some recent experiences I've had FWIW:

I once did a three hour exposure in a worklight-lit theater with a paper negative in a Speed Graphic with a pinhole that was around f/120 and it wasn't nearly long enough.

I recently shot some indoor shots with a paper negative. Shooting outdoors I usually rate the paper around ASA 6, but indoors I shot at ASA 3 and probably could have done ASA 1.5. Lighting was with a couple of 60 watt bulbs about 4' away.