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Flash reflection on glass

Discussion in 'Photography Tips, Tricks & Tutorials Forum' started by Hannah T Lobban, Feb 4, 2019.

  1. Hannah T Lobban

    Hannah T Lobban Member

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    Hi all,

    Looking for some advice on flash photography (I’m very new to it).

    I’m trying to shoot ink dropping/flowing through water in a fish tank, and I’m using flash guns in order to do that.

    However the flash is reflecting on the tank and I can’t seem to find a way to avoid it. The worst offender is the flash from my camera, which I’m using to trigger the flash guns.

    I know how to use clone tools etc in PS but would rather not rely on it.

    Thanks in advance, H
     
  2. MikeB

    MikeB Always on Premium Member

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    Change the angle of the camera-to-glass so the light doesn't bounce back to camera. If that doesn't work, consider using transceivers with the remote flash rather than the on-camera flash.
     
    Hannah T Lobban likes this.
  3. oldgeezer

    oldgeezer Always on Premium Member

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    How many flashes are you using ? Or do you only have the one off camera flash.

    The cheapest way is to buy a Flash Sync Chord that fits on the hotshoe of your camera.
    That way you can fire the speedlight s without using your pop up flash.

    Light the tank from the top, 90 degrees from the side of through diffusion from the back.

    This is what I did last week.

    https://www.photography-forum.org/threads/inverted-water-splash.152637/

    If you use lighting from above you can just put a white card up against the back of the tank, it should be enough from the top light to come lot white.
     
    Last edited: Feb 4, 2019
    MikeB likes this.
  4. Hannah T Lobban

    Hannah T Lobban Member

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    I’m using 3 in total, 2 off camera flashes situated on either side of the tank, then the on camera flash which triggers the guns. Thanks again, H

    Thanks, I have experimented with angles but there’s nowhere else suitable for the flash guns to go in terms of angle, they same to reflect everywhere. Can keep experimenting though. If I move the angle of the camera then the flash disappears but then the photo isn’t at an angle that I’m happy with!
     
    Last edited by a moderator: Feb 4, 2019
  5. oldgeezer

    oldgeezer Always on Premium Member

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    i have edited my post so re read it with the link I put in. We can get it sorted now we have the info of your lighting.

    as @MikB says, it's all about angles. If you shoot a light at 45 degrees to the camera, the reflection will equal the deflected angle so you won't see it.
    The phrase is ' The angle of incident is equal to the angle of reflectance '
    I think I have spelt it correctly.........
     
    Last edited: Feb 4, 2019
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  6. Hannah T Lobban

    Hannah T Lobban Member

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    Thanks! Extremely useful info. H
     
  7. oldgeezer

    oldgeezer Always on Premium Member

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    @Hannah T Lobban

    I did a quick setup video for you. Just a quick bodge job but it proves it is easy enough to fire speedlights with no glare.

     
    rebel06 and Hannah T Lobban like this.
  8. Hannah T Lobban

    Hannah T Lobban Member

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    Thanks for the video. Did you use your studio lights too?

    My studio is extremely makeshift (aka a corner in the garage) and it doesn’t have lights. So might try speedlights from above then light the background with a stronger desklamp/s...worth a shot!
     
  9. oldgeezer

    oldgeezer Always on Premium Member

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    only the 2 speedlight's. No other lighting needed.
    if you are shooting ink or paint, lighting from the rear will give a white background but you need a speedlight or flash to get white.
     
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  10. oldgeezer

    oldgeezer Always on Premium Member

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    When using flash, you cut out the effect of all other lighting using your flash sync speed which is usually 200-250th of a second. ISO 100 and around f8 so when you take a frame without flash it should be Black. Then
    you know no ambient light is affecting your shot.
    To get more ambient light you can drop your shutter speed down but shutter speed has no direct effect on the flash exposure, only the amount of ambient light you will get.
    You don't need a lot of space for this type of shot. Using flash allows you to control the lighting that's why I only used the same amount of speedlight's that you have.
    Make sure your back light has the sensor pointing up so it sees the on camera speedlight when it fires.
     
    ImSoQuazy and Hannah T Lobban like this.
  11. David McKibbin

    David McKibbin New Member

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    I use a Nikon infrared shield (SG-31R) on the camera whenever the on camera control flash might cause a reflection (or even effect the exposure when close to the subject).

    Some great advice above to help loose the reflections from the off camera speedlights - another way is to place them hard against the glass. Good luck Hannah!
     
    Hannah T Lobban likes this.

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