We purchased the Sigma EM-140 DG ring flash a couple of years ago to use on the Canon MP-E 65mm macro lens. The flash mounts on the end of the lens using the supplied adapters but this leaves the flash lights around 30mm in front of the lens....
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Neutral Density Calculator for photographers to calculate the shutter speed when adding neutral density filters to your lens.
Set the filter you are using and the shutter speed without the filter and the app calculates the new shutter speed...
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