People often associate sepia-toned images with "early times". This makes Sepia filters useful tools for producing believable flashbacks and for period effects with color film. Other colors are still visible, which is different from original sepia-toned photography, but appear infused with an overall sepia tint. Tiffen offers three types: #1, a mild version to enhance cool/bluish lighting such as outdoor shade, and overcast daylight; #2, twice the color density of the first, with applications for flashbacks and setting a "period" atmosphere; and the #3, which has the same sepia coloration as the second, but also combines a mild fog effect, which works very well together in many situations.
Gives an old-time feeling to new images.