I'm looking for "smallest is best" camera gear for backpacking. One of the larger photo stores in the area has told me there is no smaller GND filter and holder than the one he sold me, shown here: http://planetrambler.com/gradientfilter-holder.jpg This holder and filter is DOUBLE/TWICE the size I need for my lens/needs. It's made to fit almost every lens, big and small. I'm looking for lens and holder that only covers my lens diameter (inside of steel ring, bottom right) Is there a such a graduated neutral density filter and holder on the market? I envision a screw on with add'l rotating filter attached, maybe with tick marks so you could tell where the gradient begins/ends. TIA!