So I made the decision to go with Kase Filters. Dropped just short of a grand for their filter holder, magnetic polarizer and four filters. A 6 and 10 stop ND 100mm sqaure and a .09 (3 stops) grad and .09 reverse grad which were 100mmX150mm.
While running errands today I managed to stop by a local park and give a quick, and very unscientific BTW, test on the 10 stop ND to determine the neutrality of the filter.
All shots were shot
with the magnetic polarizer mounted in the filter holder and attached to the DFA 28-45. Metering was in camera TTL as I didn't have my light meter with me. Conditions were extremely windy (20MPH+) and leaden skies with rapidly moving clouds.
Scene shot WITHOUT 10x ND or .09 grad
Image shot through 10x ND and 3 stop grad
100% Crop out of camera JPEG with just the polarizer
100% crop with polarizer, 10x ND and 3 stop grad.
Stephen