Leica LTM What is this Summitar filter used for?

Leica M39 screw mount bodies/lenses

gjlynx

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I recently acquired a IIIc with a 50mm Summitar and that prompted me to check out some filters that I received many years ago from my dad when he sold his IIIc and no longer needed them. The one in the picture is marked "PF" and is blue in color. Anyone know what this might be used for?
 

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I'm making a wild guess here, but I think that PF stands for Photo-Flood. This bluish filter would correct for the reddish yellow color balance of the incandescent photo flood bulbs, when used with daylight color film.

Mike Sullivan
 
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