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Message: <blockquote data-quote="Steve C" data-source="post: 1480821" data-attributes="member: 56622">That brings up a possible alternate use for the flip up.  The thought occurs that, depending on the filter, the covers could be modified as a filter mount.I have seen some Leupold Gold Ring filters on those binocular.  The do in fact seem to decrease the transmission.  I can't see where adding another piece of glass to the design would not decrease transmission.  But since this seems somehow necessary for you to do, good luck.  I would be curious to know how it works out.  The only thought I have ever had for the need of a filter was on a low powered binocular to filter the water surface to use as a fly fishing binocular.  That was just an idle thought I had one day out on the river with a fly rod.</blockquote>