Filters - Round v. Square

[TxLerman]

I have been thinking of adding some graduated neutral density filters to my gear and I have a couple of questions:

(1) Do you use round or square filters? Which brand?

(2) If you use square filters, do you use resin or glass? Is there a difference besdes cost?

(3) What filters do you use?

[billbunton]

Round GND filters don't leave you much option for composition, as you can't adjust where the split occurs. With square (rectangular, actually) filters you can slide them up and down to adjust where the split occurs, so you can frame the way you want. I use the Singh Ray resin filters.

[tc95]

+1 with what bill said...to add...you can also get custom filters cut from a local glass store...with the square....