Yep, the SBC uses a silicon cell that's why they changed the name from the regular Luna Pro. Silicon is a resistor, not a generator, and thus requires external power.

It uses a Silicon Blue Cell (SBC) rather than selenium, so it's not subject to the degradation described above.

The problem with buying a used selenium meter is that you cannot know the storage conditions, and thus the cell condition.Įven if the meter includes a case, you don't know whether or not the meter was stored in the case, out of the light. If the meter is kept in a closed case except when actuallyīeing used, the degradation will be much more gradual, but it still does happen. The key is how long the cell has been exposed to light. This happens much more rapidly if constantly exposed to light.įor example, a camera with a built-in meter and no case, sitting on a mantle for years, will definitely degrade. They generate electric current when exposed to light.Īs they age the capacity decreases. Work well in extremes of temperature (have used mine in minus 25 degrees in Poland and over 40 degrees in South America)Įasy to read dial that corresponds well to the Zone System Very reliable and easy to calibrate if necessary All were accurate and remain in a drawer as 'spares' should I ever have a problem with my working meter which is also a Weston V. Over the years I have bought three or four Weston Vs at very low prices and checked them against the Weston III. My reference meter (the one that I used to undertake my film tests) is a Weston III which has a selenium cell that will not deteriorate.

The later Weston meteres (V onwards) can suffer - sometimes - from a slow deterioration but this becomes obvious very quickly. However, I do not understand the need to avoid selenium meters. I agree that THE most important quality that a meter requires is CONSISTENCY.

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