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What do I use the Sekonic L308Bii Lumidisc for

Wayne Walker (UK) , Feb 16, 2000; 12:20 p.m.

I have a L308Bii and I have successfully used it for flash meter and incident meter readings. However, I rediscovered the Lumidisc in the pocket of my camera bag over the weekend, I understand it can be used as a type of incident spot meter/contrast reading however, I have never fully understood how to make the most of this attachment.

Please would you enlighten me, on what Im missing?

I have search the archives and found no threads on this.


Alan Gibson , Feb 16, 2000; 01:51 p.m.

It is for incident readings. Use the dome when the subject is dome-shaped (example: human heads), and the disk when the subject is flat (like a document).

C Terry , Feb 16, 2000; 03:21 p.m.

The Lumidisc is used for measuring light contrast and for illuminance metering (p. 10 of the manual). TO MEASURE LIGHT CONTRAST (it's primary use) : You fit the disc, select your mode, hold the 308B close to the subject and point it twards the main light source (turning off the auxilary light source) and take a reading. The point it twards the auxiliary light source (turning off the main light source). You compare the difference in brightness between the main and aux light sources, and determine contrast (there is a grapf showing the contrast for different readings in aperture stops read). (in a side note : To obtain exposure, hold the 308B close to the subject, and point the LumiSPHERE (not disc) twards the camera with the main and aux light sources on. USING THE 308B AS AN ILLUMINANCE METER : Fit the disc, select EV metering mode and set ISO at 100. Face the disc twards the lighting and paralell to the subject and take a reading. There is a table to convert EV readings to lx values.

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