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user 19287
For questions pertaining to photographic filters, which are usually glass or plastic accessories that are either screwed onto the lens or otherwise added in the optical path. Use "software-filters" for effects filters applied in apps such as Instagram, Photoshop, GIMP, etc.
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Neutral Density Filter for a 58mm filter diameter
Concerning the ND parameter:
ND2: Passes 50% of the light intensity (1 step). Therefore, to achieve the same exposure had no filter would require a doubling of the exposure time.
ND4: Passes 25% of …
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