Originally Posted by
xkaes
Given the prices they charge for their ND filters, you deserve an accurate filter, as well as a free night at a luxury hotel.
Your test methods leave a lot to be desired but since I don't know your gear, all I can suggest is to put your camera on a steady support. Then meter a blank, midtone scene, such as a gray card or evenly illuminated wall -- with and without the ND filters. Hopefully your camera gives you some sort of f-stop and shutter speed readout that you can compare. Without that, I'm afraid you are just using your eyeball -- not too accurate.
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