Response to What is the difference between Tri-X and Tri-X Professional?

Yes, these are two completely different emulsions. Why Kodak saw fit to call both Tri-X, only they know. In my opinion, this is misleading and dishonest. TXP has a real speed of 320, like TMY; TMY is a better film, less general fog, straighter curve, less grain. TX is rated at 400, but will not get above 250. Even then, it shoulders rather severly beginning at Zone VII. If you are looking for a GENUINE 400 speed film, one that is the SAME EMULSION in all formats, use Ilford HP-5+. This film has a moderately short toe and is ruler flat from Zone II past Zone IX! It stains beautifully in PMK and produces superb prints. Generally, the best B&W film is made by Ilford. You can't go wrong with any of them. Just beware; Delta 400 is actually 250.

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