make / manufacturer: Wollensak
model name / number: No. 6
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The Differential filter, or sky filter is recommended for cloud and landscape work. The density of the filter is graduated, therefore, only the upper half of the filter is stained yellow, and the lower half being colorless. The filter is designed to equalize the difference in light between the sky and foreground, so as to hold back the sky while full exposure is given the foreground to show correct tonal qualities.
Filter comes in original hard sided leather case with velvet lining, embossed with Wollensak logo in gold on top.
Excellent clean vintage condition with minor wear. Glass is clean and clear with no visible scratches, however, there is some delamination around the outer edge of the filter near the rim measuring approximately 1/8". While not an obvious visual flaw, it may soften the edges of a photo. From a smoke-free environment.
**IF THIS LISTING IS ACTIVE, THEN THE ITEM IS STILL AVAILABLE.