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Review Summary
2011-10-23T21:00:00
I had purchased a lens tube for my Olympus XZ-1 (not on this site). Turns out the cheap tube was made just a little too short, so if I screwed a filter onto the end, the lens at full zoom would hit and retract. I purchased one of these and it gave the tube just enough length for the lens to extend without hitting the filter.
Mark
Some wide-angle and video zooms have a retractableactable lens assembly which means that the COKIN Filter Holder may inhibit the use of some focal lengths. To remedy this situation, use a protective screw-in filter (UV or SKY1A) and add one or several "extension rings" between the screw-in filter and the adaptor ring of the filter-holder.
Extension rings are also useful with some home video cameras which have elements obstructing the free rotation field of the filter-holder.