For the longest time, I hoped to find some cheap Chinese knock off filters for the Lee Seven5 system. But I have stopped hoping, since the Seven5 system doesn't seem to be nearly as popular as the other 100 x 100 mm system. I just could not justify spending almost $ 100 on each filter, so I stopped after two. But a girl needs options...
Rangers to the Rescue
On Amazon, I found the Rangers filter system. Comes with a handy-dandy pouch, 4 ND filters and 4 graduated ND filters. And of course the whole attachment system I don't need. The filters are 83 mm wide, but my Seven5 holder only fits 75 cm wide filters. I purchased the system anyway with the intention to cut the filters to size. But how?
Well, there's always Google
On Google I learned how to cut plexiglass. Actually, you don't cut it - you snap it. I scored both sides of the filter a few times, and then snapped off the excess by moving the filters to the edge of the table, gripping the edge with pliers and then just snap it off. It leaves a fairly rough edge, so fine sanding paper is needed. I finished it off with a glass nail file. I read somewhere that you can also smooth the edges by using a blow torch, but that seemed overkill.
Btw, scoring, snapping and sanding is so much easier than using the Dremel. The Dremel is just too powerful, even at low speeds.