I'm not sure if this belongs in this forum or not. I will be using an F4, Fe2, or FE for my exposures so if nothing else, that's a reason for placing it here. I want to experiment with Graduated ND filters. Cokin to be specific. (I am of the understanding that they are actually grey and not true ND filters) My question is this.... In order to darken clouds, (both color and B&W) making them appear more ominous for example, do I meter the scene without the graduated filter in place and then drop it in after I determine my exposure info? Will there be a difference if I use the matrix meter on the F4 as opposed to the FE2 or FE ? I will be bracketing but I'd kind of like to know what to expect, or if there are any basic rules of thumb to be considered. I'd like to add that I probably (99.9%) will not be manipulating the image after the fact (ie photoshop) so I'd like to get it right, right out of the camera. Thanks.