The data sheet at the Ilford site states that SFX200 will produce results much like any other B&W panchromatic film if used with a regular red filter. (they call a 25 a "light red") For dramatic effects, they say use a dark red filter, B+W 091. For maximum effects, use a very dark red filter. I got the Ilford filter (a gelatin sheet) for SFX, and it's almost opaque. I'm disappointed that they don't tell you this in the instructions which come with the film. You're going to need to use a tripod and a very dark red filter to get the most out of this film.(posted 9345 days ago)