The Nikon SJ-5 Color Filter Set is a total of 20 filters in eight colors that are used with the SZ-4 Color Filter Holder, available separately. The set includes two each of the FL-G1 and FL-G2 fluorescent filters to balance light from the flash to fluorescent lighting; two each of the TN-A1...
The SZ-2FL is a green color filter that is placed on the SB-910/900 Speedlight to change the color of the flash from daylight balanced to Florescent balanced light.
The Nikon SJ-1 allows for modification of the flash output to be matched to the background scene. This is especially useful for digital cameras where "white balance" can be controlled.
For instance, when shooting with a flash under fluorescent lights the foreground will be white, but the ba...