Except when those films were created all film speeds were around one stop slower. Plus=X was 50, Double-X was 100, and Tri-X was 200.
Tri-X was also available in orthochromatic until the late 80s or early 90s.
Hi:
Pan X Pan= ASA 32
Plus X Pan = ISO 125
Double X Pan= ASA 250
Tri X Pan = ISO 400 (320 Pro)
Royal X Pan = ASA 1200
In the way of the "X", an old time evplaned it to me (a very long time ago) is, Pan X = 1 stop, Plus X = 2 stops, XX = 2 1/2 stops, Tri X = 3 stops and Royal X Pan = 4 stops.
Here's Kodak's take on the differences: http://www.kodak.com/global/en/professional/support/techPubs/f4017/f4017.pdfIf you guys don't mind me tacking on...I've been wondering about Tri-X myself...
...what IS the difference between the 320 and the 400?
Are they both available in all sizes?
Why offer two films so close in name and speed? :confused:
Is it safe to assume that the Arista Premium version is actually the 400TX and not 'Tri-X Pan'?
It is. I changed my post to reflect the nomenclature you're using and avoid confusing you. I've been through several Tri-X changes and still call whatever is current "Tri-X", especially when the change was made several years ago. If you look above the big 400TX on the new boxes, it still says Tri-X 400. IIRC, part of the reason for changing Tri-X was the construction of new lines and opening of new plants in China to produce the film. I also believe the old lines were shut down, and may have been disassembled. You'd have to ask PE or someone else in the know for better info there. But I think it's unlikely that the old version of Tri-X remains in production.Lee,
I was under the clear impression, from the Kodak documents, that the 400TX was the newer film and Tri-x Pan the older film.
If you guys don't mind me tacking on...I've been wondering about Tri-X myself...
...what IS the difference between the 320 and the 400?
Are they both available in all sizes?
Why offer two films so close in name and speed? :confused:
They keep both films in production because they are different films. 320 TXP has a shorter toe and more highlight contrast with a retouching base, is designed for studio work, and is less forgiving of underexposure than 400TX. 400TX is for shooting in varied, less controlled lighting. People choose to shoot the 320TXP for specific reasons.I think that Tri-X went from 200 to 320, then later was redesigned as a 400 speed film, but for some weird reason, Tri-X 320 was kept around. Kodak should have gradually added Tri-X 400 in the sizes they kept making Tri-X 320 in , then gradually phase it out. This probably should have happened decades ago.....
Doesn't really matter much to me, I use HP5 when I want a fast film....
They keep both films in production because they are different films. 320 TXP has a shorter toe and more highlight contrast with a retouching base, is designed for studio work, and is less forgiving of underexposure than 400TX. 400TX is for shooting in varied, less controlled lighting. People choose to shoot the 320TXP for specific reasons.
Look at the curves in the Kodak tech bulletin link five posts back.
Lee
KODAK PROFESSIONAL TRI-X 320 and 400 Films are high-speed panchromatic films that are a good choice for photographing dimly lighted subjects or fast action, for photographing subjects that require good depth of field and fast shutter speeds, and for extending the distance range for flash pictures. TRI-X 400 Film (400TX) is available in120 and 135 sizes and 35 and 70 mm long rolls. You can retouch the 120-size film on the emulsion side. TRI-X 400 Film is recommended for push-processing applications.
TRI-X 320 Films (320TXP) feature excellent tone gradation and brilliant highlights. They are especially well suited to low-flare interior lighting or flash illumination. They are also useful for portraiture with low-contrast backlighting outdoors.
One TRI-X 320 Film (320TXP) is available in 120 and 220 sizes on a 3.9-mil acetate base, the other is available in sheets on a 7-mil ESTAR Thick Base. You can retouch
these films on the emulsion or base side.
Correct Steve. I misspoke. Thanks.Lee,
I think you meant TXP has a longer toe.
Steve
Tri-X was panchromatic from introduction. At one time there was a Tri-X Ortho sheet film, for portraiture of ruddy-faced men. Long gone.
The film that changed from orthochromatic to panchromatic was Verichrome, which changed to Verichrome Pan when it went panchromatic in 1956.
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