T Max 100 has the best of the films I've used. John Sexton has published times for 100 and 400 based on his tests. In general they're about 25% better than non-T Max films . IIRC the first adjustment with T Max 100 using John's times is at 4 seconds.
Brian Ellis
Before you criticize someone, walk a mile in their shoes. That way when you do criticize them you'll be
a mile away and you'll have their shoes.
I shoot Portra 160VC exclusively. Kodak states there is no adjustments for reciprocity for the entire famiy of Portra films for exposures up to 10 seconds. After that they only recommend you make tests under your own conditions.
A second vote for Portra. I shoot both 160NC and 400NC and I use a half stop extra between 1s and 10s, and a stop from 10s to 20s. Anything longer than that and I go home. I tend to expose the 160 at ISO 100 and the 400 at 320 or so.
The behavior of these films in every respect including reciprocity is exemplary. It's very hard for me to think of ways they could be improved.
Hello! I tested TMax 400 for astrophotography. Out to 16 minutes, it lost 2 1/2 stops. Best regards.
Mike
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