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Unlike the Firecrest 85/100mm filter holder, many older design systems such as the Formatt Hitech Aluminum 85/100mm filter holder doesn't offer any specific protection against light leaks.
A foam gasket can be used to help block this light entering behind the filter and ruining your landscape or long exposure shot. The gasket will make a big difference however it should be noted that it is not a definitive solution.
Gaskets are not compatible or required if you are using the new Firecrest 85/100mm filter holder.