Anyone have any experience with the filter system from Fotodiox. I am looking for a system that can fit the Samyang (Rokinon) 14mm f2.8 or the T3.1 lens and this is the only product that fits this lens. Other option is the Hitech system from Lucroit. I have no idea if their (Fotodiox or Hitech's) ND and GND filters have any color cast issues. Any insight on this matter would be very helpful. Unfortunately, Lee filters dont work with this system yet (I think).
I have a ND 5 stop and a CPL from this range, which I use with my TS-e 17L. They are massive filters and that's the difficulty in using them. I personally don't bother with ND Grads, they are a left over fad from film days and rarely produce convincing results. I get far better results using a tripod and combining two exposures in Photoshop.
The ND 5 stop has a gold colour cast, but I've yet to handle a ND or ND grad that doesn't have some sort of colour cast. Heliopan, Lee, Hi-Tek, Hoya, Cokin, Singh-Ray, B+W....they all have some sort of colour issues. I think the trick is to get one that is pleasing and looks nice.
The system certainly works well, although it's too big to leave on the lens and then put in a camera bag. It's well made, but not up to Lee standards. With a single filter, I can fully tilt and shift. With 2 filters, I can shift 10'..which is fine for most correction.