Friday, October 12, 2012

Colorful reflected UV ultraviolet photography ?

I was always wondering if reflected UV photography would have to be so drab in terms of colors. We humans are so used to a wonderful world of colors, so I thought I should experiment a bit with that topic. Well, I was curious to see how that Rudbeckia fulgida flower I have here would look like, if I would create a bit colorful background for it, when shooting it in reflected UV light using my "work horse" UV filter, the Baader-U filter. Well, here an example for that...

[click on image to see a larger one]

Rudbeckia fulgida:
 

Now this is "artsy" and still documents the wonderful and very prominent UV pattern this flower has, very well still useful as a documentary.

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

D.O. Industries 50mm old enlarger lens: reflected UV ultraviolet photography

I was digging through boxes, when some older, but new in box D.O. Industries f4.5/50mm enlarger lens fell into my hands. Well, I was curious to see how it would perform in UV, so I took a few shots in the Hermannshof park with it, using my "work horse" UV filter that never let me alone, the Baader-U filter. How nice that this lens has a 40.5mm  filter thread, as not all enlarger lenses have that. A simple short M42 focusing helicoid served as a focusing aid and as it has a Leica thread mount (M39), so simple M39-M42 ring was all needed to make it fit. All shots were done at f8 in evening last sunlight with not much UV left to use.

[click on image to see a larger one]

Rudbeckia hirta, wild form from Illinois:


same, but closer:


Rudbeckia fulgida:
 

Quite impressive performance for a most likely simple Cooke triplet 3e/3g lens. Oh and I forgot to mention, is has no (or barely any) focus shift. Here is its transmission graph versus my usual reference lenses, which reaveals how well this lens transmits UV:

 

More research and testing needs to be done, but it could form the basis of a comparably cheap UV photography system; we'll see...

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