Response to Acros & HP5+

Now you've done it, Jorge! I'm going to have to run film tests to determine EXACTLY what the stuff will do. 'Scale' is easily seen by the shape of the HD curve. The test exposures must be made at the correct film speed and development time. Most films will have a reasonably straight curve when exposed and developed according to real world tests. We get into trouble when we take the manufacturer's specs as true. TMX is not one whit faster than 64, but when 'push' developed to 100, it gets real nasty and harsh. Some photographers blame their lab or just give up and use something else where the rated speed and suggested dev times are more nearly accurate. When you shoot TMX at 64 and develop for a straight curve, it's a very nice film. Just too slow for any practical use with handheld shooting. Delta 100 has a straighter curve and will give 2/3 stop more speed. A densitometer is indespensible if you want to get the most from your films. NEVER take a manufacturer's spec as gospel.

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