How do I do reliably water sealed?

Discussion in 'Beyond the Basics' started by Village Idiot, May 5, 2008.

  1. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    I need to flash under water. Yep. Under water.

    There was a post on strobist about wake boarders who use PVC sealed with one end cap using a clear plexiglass piece for the flash to shoot through.

    I was thinking about doing something similar, but I want to have easy access to the flash/PW for battery changes if needed. Plus it has to be completely sealed so no water what so ever can get in. Pluss I'm going to weight it as it has to be able to sink.

    Is there any type of gasket or material that I can specifically use for a screw on piece that will reliably seal my contraption and can do so without having to be replaced after using it four or five times?

    Am I going to be using a ton of weight to sink a hollow sealed object that will probably have pretty good bouyancy?
     
  2. davebmck

    davebmck TPF Noob!

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    I'd figure out how to use an O-ring seal. That is what is used in diving lights.

    You can calculate the weight you will need to sink your rig by determining its volume. The the weight of the volume of water it displaces minus the weight of the rig is the approximate amount you will need to make it neutrally bouyant. A small additional amount of weight will cause it to sink.
     

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