Inserting the Optional Extension Rails
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1. Slide the front rail included with the F:X Pro filter
holder Mark III inward to the center of the filter
holder. The rail comes loose.
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2. Now place the extension rail on the section so that
the two notches on the filter holder match those on
the extension rail.
Now push the extension rail outwards until it clicks.
You can now insert another square filter into the
F:X Pro Mark III filter holder.
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