I am looking into a filter setup for my 17-40 on my 5D. I am considering the Cokin Z-Pro or Lee holder with the wide angle adapter.
I am looking for suggestions for using a CP with GNDs in a filter holder. I assume that I will need a drop-in filter? If so, best option I have seen so far seems to be the Singh-Ray LB CP in a sprocket mount. I know a number of photographers who use and like the Singh-Ray, but at $400 it's more than I'd like to spend.
I'm wondering if there are any options that I'm missing, or should I just go with the Singh-Ray?
Or another option, would it be better to get the Singh-Ray screw-in CP (for half the price) and handhold a GND in front of it?