Response to Acros in Microphen - and why are ISO ratings inflated?

Avoid entering any situation where your good health depends on the accuracy of your iris control, your shutter speed control, or the accuracy of the ISO rating on the box. I'd be willing to bet that each of those quantities has manufacturing tolerances. Does any one of you know what is the actual value of any of these qualities when you set it? How much precision are you expecting? How much do you think you really need? Who told you so? How would you find out the accuracy of your camera settings without using film?

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