I am shooting in Paris, and the weather right now vacillates between strong sunlight and an overcast, rainy sky. I suppose I'll have to go with the ND when the sky is too bright, otherwise go for the Plus-x stock. If I go for the latter, do you think there will be a visible difference in grain or contrast? I have considered the red filter idea and may also decide to do that. What graduated ND filter for the R16 beaulieu 16mm camera would you recommend I use?