Take a large Ziploc bag and pull it back over the camera so the open end surrounds the film back, stretch the front of the bag over the front of the lens and screw a filter in right over this, then remove the filter momentarily and remove the plastic disc which the filter threads will have cut out, and which will (usually) result in a nice plastic "flange" - creating a front element seal when the filter is then re installed over this. Leave plenty of loose plastic material over the lens controls to make adjustments possible (you may want some reinforcing tape over the knurled components) and poke a small hole for the cable release. You are stuck with the lens in question, but this system does work. Just make sure the open end of the bag drapes far enough over the film back to protect the film holder itself (you'll need to move the plastic out of the way to install the holders) and be really careful not to get water inside the holders! Of course, there is at least one metal 4X5 I know of which is completely unaffected by water - but you'll still need to cover the lens! : ) Happy Holidays!
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