Please explain. This pic for example. That stuff looks heavy like hell. My el cheapo plastic box is heavy enough not really feeling to put in onto a lens...
Glass filters arent exactly thin air either. Does any pros actually do this? Or is this a diversion from the photography guys just clipping on a 4x4 holder?

Glass filters arent exactly thin air either. Does any pros actually do this? Or is this a diversion from the photography guys just clipping on a 4x4 holder?
