Response to Pull proccessing tri-x and t-max

The ISO speed is determined under controlled conditions and is usefull to the individual photographer as a starting point. The carefull shutterbug does tests to determine a personal exposure index (EI) that takes into account individual equipment and technique. The published development times are also a starting point. The object with silver image B&W film is to find a minimum amount of exposure that gives adequate shadow detail and development that gives desired contrast. Many find EI to be lower than the ISO rating, some end up with EI higher. Increased development will not restore lost shadow detail due to underexposure. Overexposure increases grain and reduces sharpness.

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