Considering how often these appear on Ebay, I was surprised to find that there is, apparently, no mention anywhere in the Forum - and very little on the Softar, either!
These disks were marketed by Eastman from the 1920's and were found in several sizes. There are two items - a holder mounted to the lens and an insert filter/disc, which has a handle suggesting alternative use.
There is a very complete description (verbatim from Eastman's advertising, perhaps) on line which describes the use of the A (small soft effect) and B (more effects) series in portrait photography. It also describes how the filters can be used in darkroom.
I am sure they are just as effective/ineffective as later devices, but has anyone experience of their use?
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