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Flash Deflector and Strobes

Discussion in 'Strobes and Lighting' started by Scuba_Noob, Apr 4, 2012.

  1. Scuba_Noob

    Scuba_Noob Solo Diver

    # of Dives: 200 - 499
    Location: Victoria, BC
    1,000
    195
    0
    Hi all,

    I have a Canon Powershot S95 in an Ikelite housing with two YS-01 strobes. I use a flash deflector on my housing so that the internal flash doesn't flood the image. Recently I've read some posts where people use black tape on the inside of their housing so that the internal flash light doesn't affect the image and lead to backscatter.

    The question is: Do I still need to tape up the inside of my housing or does the deflector prevent the internal flash from affecting my photos (i.e., using only strobe and natural light)?

    Thanks.
     
  2. sunkmail

    sunkmail Dive Equipment Manufacturer

    # of Dives: 200 - 499
    Location: North Vancouver, BC, Canada
    256
    13
    0
    Not sure if the deflector has any negative effects on your images, but I taped up the insides so i didn't have to have the extra bit of plastic in my way. Something to consider. :)
     
  3. flareside

    flareside Manta Ray

    # of Dives: 100 - 199
    Location: Route 66, about halfway
    627
    123
    43
    The reason for taping the inside is to keep the light from the flash from getting into the clear plastic of the housing. Once it gets into the clear plastic, it travels within the plastic and you have no control over where it comes back out. And it really doesn't take much tape, just enough to cover the sight lines of the flash. Ref: http://www.scubaboard.com/forums/st...lash-canon-s95-inon-s-2000-a.html#post6238156
     
  4. Scuba_Noob

    Scuba_Noob Solo Diver

    # of Dives: 200 - 499
    Location: Victoria, BC
    1,000
    195
    0
    So to confirm, you're saying that even with a deflector, I should still tape up the inside of my housing?
     
  5. flareside

    flareside Manta Ray

    # of Dives: 100 - 199
    Location: Route 66, about halfway
    627
    123
    43
    First, what is it you are calling a "deflector". Are you referring to the white translucent piece (the diffuser) or are you talking about a black opaque plastic shade? And as to whether you need to tape or not is all a matter of whether you are having a problem with backscatter or stray light in your images. It really makes no sense to apply a solution if you're not having a problem.
     
  6. Scuba_Noob

    Scuba_Noob Solo Diver

    # of Dives: 200 - 499
    Location: Victoria, BC
    1,000
    195
    0
    It's called a "deflector" on the Ikelite page. It's shaped like the diffuser, but it's completely opaque (and it's white). It's put right behind the lens, i.e., on the second ring (PRO-2800 LED Light System - view the third photo for the deflector). Thus, it reflects the flash back at the photographer.

    To answer your question, yes, sometimes I have problems with backscatter. The problems, in my opinion, stem from particles/visibility and strobe placement, as opposed to light from inside the camera (due to the deflector).

    Therefore, the question would be, even with the deflector, is it possible for light from the internal flash to negatively affect photographs, or should the deflector prevent that?
     
  7. flareside

    flareside Manta Ray

    # of Dives: 100 - 199
    Location: Route 66, about halfway
    627
    123
    43
    To find the answer to your last question can really only be achieved through testing. In a dark room with the camera fully assembled but the strobe turned off take a photo about 2 feet from a wall using a wide angle setting. Any light you see in the photo can affect your underwater images. (Only direct light matters, ignore all bounce light off ceiling etc.)
     
    asha likes this.
  8. Scuba_Noob

    Scuba_Noob Solo Diver

    # of Dives: 200 - 499
    Location: Victoria, BC
    1,000
    195
    0
    Thanks, flareside. I don't think I'll need to use the tape then.
     

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