Teeth and UV I

Today about teeth and ultraviolet photography.

I found in some older books some contributions of Prof. Woods and esp. Ch. Lunnon about photograping teeth using ultraviolet light.

So here some results using my calibrated for UV X35 lens, a Baader 2" U-filter and my newly developed High Power UV flash.

The top image clearly shows, repairs, cracks, plaque etc. whereas the second one using a special filtering technique also shows bacteria build up (plaque) as reddish cast and repairs having being done. The small size of the images here do not really show the amount of detail which gets visible using these techniques.

[click on image let's you see a larger image]





Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos

UV and Forensic Skin Photography I

This will be the start of some entries about forensic photography. Using different wavelengths, filters, lenses and special lights, I would like to show, what may be documented on human skin using these techniques.

Lets start documenting some bruise and its development over time. Reflected ultraviolet photography is said to be able to detect these bruises even if they have disappeared in the visual. So let's see....

Here now the first image set, top row is bruise after + 4 days, second after + 8 days. Color is useless in this content I thought, so it will be "just" black and white images. I will elaborate on the different filters and wavelengths used later. 
[click on image to get a larger one]




And here how that looks like 44 days (1.5 months) later, it gets clearly visible that the normal, visible light photography hardly picks up anything of that healed bruise, whereas the special setup used (image on the right) still clearly shows that old, healed bruise!




And this is how "invisible" older and already healed scratches may be made visible:




...more will follow on that.


So I hope you like these as much as I do....

Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos

UV enhances the resolution

I have always talked about here, that UV photography enhances the resolution of the images by a factor of about 546nm/365nm = 1.5x, so today some proof that this theorem holds.

And here now the results of these test shots, identical conditions, shooting a piece of old sandlewood, using my UV Rodagon 60mm lens @f8, Baader U-filter, Nikon SB-140 UV flash .

Visual shot is left, UV shot on the right (bw version) [click on image to see a much larger image]:



And here a recent shot using the UV Nikkor 105mm, Xenon flash at f8, left UV shot (Baader U-filter 310-390nm, right shot white light, unfiltered) of skin (female hand, afro-american heritage)



It gets quite obvious, that the resolution of the UV shot is much higher.

Should I find the time, I will re-shoot that test using a monochromatic light source for UV, such as my Nichia 365nm UV LED lamp and a narrowband filter for visible light also, such as 546nm (green), and again compare the results then.

Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos