Cokin Gradual Tobacco Light Filter X-Pro Series XP124 - T1 graduated tobacco filter reduces the light 1 stop. XP125 - T2 graduated tobacco filter reduces the light 3 stops. XP125L - 2X Light starts with the same density as XP124, but feathers the tobacco almost from the color edge and more gently graduates to clear. One stop of compensation. XP125S - 8X Is the same density of color as XP125M but the graduation extends to 3/4 of the filter. Requires 3 stops. XP125F - 8X Full is the same as XP125S except that the tobacco covers the entire filter. Requires 3 stops.