User ID wrote:
16 stops is ND 4.8, and anything from 4.0 or beyond is safe for solar observing. Youve got an extra 3 stops beyond 4.0, just in case the sensor possibly needs even more protection than your eyes.
As to counting up all your zeros, you might find that the standard density notation is far more comprehensible than those ginormous lengthy numbers that you mentioned. (Its a little trick called an inverse log scale. It can take really unwieldy numbers and compact them into manageable bite-sized notation.)
In whole stops the scale goes 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, and on and on. Each 0.3 that you add is one more stop. Its just plain dirt simple addition, over and over. (NEVER ask WHY the increment is always 0.3 and your head wont hurt !)
16 stops is ND 4.8, and anything from 4.0 or beyon... (
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Right. Not asking. Head hurts just thinking about asking. Do not need to know! My idea of ‘math’ is phone numbers and the Dewey Decimal System and recipe measurements.