Photography

Posted by Joe Joe
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Question-

What is the best way to photograph evidence (shoe impressions, fingerprints, etc...) on glass or mirrors without getting a camera/photographers reflection? Reflective surfaces are my kryptonite and I would appreciate any tips.

Joe

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Re: Photography

One of the first options I would turn to if available would be a RUVIS (Reflected Ultraviolet Imaging System).  Latent prints do not need powdering or chemical enhancement prior to this type of imaging.  Most materials, including glass, absorb short wave UV light.  This causes the background to appear dark and non-reflective.  Only the fingerprint will be visible.

The second method for impressions on a mirror takes a bit of practice.  It works easier with a camera tripod and/or an assistant to help hold things.  You will also need a small sheet of glass and a flashlight.

First, use black powder on your impression.  Next, set your camera up in front of the mirror.  Standing behind the camera, hold the sheet of glass at a 45 degree angle between the camera lens and impression.  The left edge of the glass will be closer to the mirror, while the right edge will be closer to the camera lens.  From the right side, shine your flashlight onto the glass you are holding.  This causes some light to be reflected down onto the mirror.  If everything is set up right, the background will appear white and the impression will be black. No reflection.

For other reflective surfaces, it all comes down to controlling your light; both ambient and direct.  You can use white shades to control glare.  For windows you can hold a sheet of paper behind the glass.  Conversely, shining a light from behind the window towards the camera can also work too.
CSIChick86 CSIChick86
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Re: Photography

In reply to this post by Joe
What kind of impression? Like dirt? Or grease? If it's greasy, you can super glue it, use a macro lens, use a shorter depth of field, and use oblique lighting. With the shorter DOF you should be able to just focus on the print, and not the reflection. Or find a neighboring agency with a RUVIS or FSIS (which blows RUVIS out of the water)
Joyce Joyce
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Re: Photography

In reply to this post by Joe
fingerprints photograph below videos for you reference:

OR-GZP1000  https://www.youtube.com/watch?v=DEf9vsPqbnI


OR-GQP3000  https://youtu.be/NuebrGS3nq8