Response to Different Exposure index

Shadow detail (as Doremus has so well described) and the use of developers that shall offer better tonal range but the use of which makes the film lose some light sensitivity. Many of us believe that the manufacturer's given speed of films is not real, but created in the lab (by using specific combinations of exposure and development) to "boost" the numbers higher (for commercial reasons). So, the best EI for HP5 might easily be 200 and exposing the film at that amount of light may help it to give its best in terms of quality.

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