just want to share some experience on the RGND … it is same function as GND but it gradual from center toward top part as picture below show
it use when the light source is stronger at center portion .. and sharing some picture using it either 2 or 3 stops …
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update 2013 Aug 28
what RGND do for you
Right – CPL + RGND
update 2012 Oct 11
– Singh-Ray RGND 2 stops
– Singh-Ray RGND 3 stops
– Lee filters 4×4 CPL
– Singh-Ray RGND 2 stops
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contact me if you looking for Lee Filters or Singh-Ray @Malaysia ..