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Tiffen FLB vs. FLD


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#1 Marc Roessler

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Posted 30 June 2012 - 12:03 PM

Hi,

on its webpage, Tiffen states: "Use FL-D with daylight film and FL-B with tungsten film".

Unfortunately, nothing is stated about the type of flourescent (cool white, warm white, daylight). (And nothing about how bad the green spike is)

In principle, you could encounter the following scenarios:

1 warm white (< 3300K) -> tungsten film
2 cool white (3300 - 5300k) -> tungsten film
3 daylight (> 5500k) -> tungsten film
4 warm white (< 3300K) -> daylight film
5 cool white (3300 - 5300k) -> daylight film
6 daylight (> 5500k) -> daylight film

So where would you use which filter?

Greetings,
Marc
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#2 David Mullen ASC

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Posted 30 June 2012 - 01:03 PM

They are referring to Cool White fluorescents (which are roughly 4800K + green), but keep in mind that these filters were developed in the 1970's I believe and were based around the spectral output of tubes back then and the spectral response of color film back then. Some Cool White tubes today are less green than others (usually its a price thing -- you want that deep cyan cast, shoot in 3200K balance and buy the cheapest Cool Whites on the market...)

The FL-B has orange added to it to convert 4800K to 3200K. Probably "B" refers to Type B film, i.e. balanced for 3200K (as opposed to Type A film, which was balanced for 3400K photoflood bulbs).
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#3 Marc Roessler

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Posted 01 July 2012 - 04:26 AM

Thanks David! I guess it all boils down to testing the flourescents at hand with the film stock to be used.
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