I have just received a 110mm XL and have been cautioned that there is no enough clearance to use a screw in filter without hitting the front of the lens. That is clearly the case with any filers where the filter glass is close to the back of the filter. But I have some Heliopan filters that seem to have enough clearance. I want to test these rather than just guess. I tried the trick of putting a piece of tissue between the lens and the filter to see if it can move after the filter is on. But static keeps it stuck to the lens so it does not shift even when the filter is loose. Any other ways to test the clearance and not destroy the lens in the process? I have thought about putting a drop of lens cleaner on the center of the lens, screwing in the filter, and watching the shape of the drop. I would prefer something that will protect the lens.
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