Despite the cautionary reviews I have the items given a chance: unfortunately. If one chooses halfway high darkening, so the corners are much brighter than the center, the darkening is uneven. In addition, the filter darkens really properly from just before "Max". I could no exposure time longer than 1 meaningful use in bright sunlight second. The scale is also (very) easy target. Since it also can not accidentally turn the focus quickly with a Vario-filter, I give now a little more from a filter set with fixed values ...
