Kodak T-Max 100 is Faster than Tri-X 320 for Long Exposures by Tim Layton It may sound a little odd that a 100-speed film is faster than a 400/320-speed film, but that is in fact, true when it comes to Tri-X 400/320 and T-Max 100.  

T-Max 100 is a common and awesome choice for landscape photographer's and the better reciprocity failure for T-Max is an added benefit.  I have created very large 50" enlargements from both Tri-X 320 and T-Max 100 4x5 sheet film, and both look great.  

They are different, but when connected to your creative vision, both can be very compelling choices.  

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I recently created a 40" x 50" silver gelatin enlargement from one of my Tri-X negatives of some Tulips which I share in the video.  The texture and grain that is inherent in Tri-X really made this print for me.  

It gave it a third dimension and texture that I don't think I could have achieved with any other film.  I have similar experiences with T-Max 100 for landscapes where I have bright highlights and delicate shadow details that are central to the print. 
In regards to reciprocity failure, T-Max 100 is much faster than Tri-X starting at about 8 seconds and it becomes drastic at 30 seconds and longer.  

Here are my reciprocity charts that I use for Tri-X and T-Max:

T-Max 100 Reciprocity: 1->1 2->2 4->4.5 8->10 15->21 30->49 60->1:47 80->2:30 100->3:29 120->4:39 160->6:42 200->9:30 240->12:50

Tri-X Reciprocity: 1->1.5 2->3 4->6 8->12 15->29 20->42 25->58 30->1:18 40->1:44 50->2:19 60->3:00 80->3:56 100->5:11 120->6:42 160->9:36 200->13:32 240->18:16

Note: the number on the left is the metered exposure and the number to the right of the -> symbol is the corrected exposure time with reciprocity.

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