--- ray/src/rt/rv2.c	1992/11/19 20:27:03	2.13
+++ ray/src/rt/rv2.c	1993/03/08 12:37:35	2.15
@@ -287,7 +287,7 @@ char  *s;
 			for (cp++; isspace(*cp); cp++)
 				;
 			if (*cp == '\0') {	/* interactive */
-				sprintf(buf, "exposure (%lf): ", exposure);
+				sprintf(buf, "exposure (%f): ", exposure);
 				(*dev->comout)(buf);
 				(*dev->comin)(buf, NULL);
 				for (cp = buf; isspace(*cp); cp++)
@@ -305,7 +305,7 @@ char  *s;
 			e *= atof(cp);
 	}
 	if (p != NULL) {		/* relative setting */
-		if (bright(p->v) < 1e-25) {
+		if (bright(p->v) < 1e-15) {
 			error(COMMAND, "cannot normalize to zero");
 			return;
 		}