Just wondering if these work with electronic flash, or just bulbs. If it is just bulbs, is it possible to adjust it for flash? (Looking to use flash with a few lenses in the future, which don't have a sync socket - still waiting responses from UK repairers, but so far no-one apparently is capable of modifying older shutters). The shutters are a Regno one, an Alphax, and an Ilex Universal, (not sure of the size but it would possibly be a 4 or a 5 - waiting on delivery to get an exact measurement to confirm size).
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