LED Lights - Using lenses to focus and dampen

[Erik Lund]

So I got a fun little project
Using lenses to focus and dampen light from LED lights - I have found asome really nice build quality LED Lights
And then I have adapted them for 39mm LTM Leica Thread Mount 

Current setup is with EL-Nikkor 50mm f/2.8 and Voigtlander 90mm f/3.5
So pin-spot on the statue and a wider beam on the top gold part.

Thinking about making a flashlight version for light-painting - Wouldn't it be great to be able to focus and dampen for the night scenes, with your lens of choice,,, 

[Birna Rørslett]

Think about the same technology combined with a 400-600mm lens ... would create a pin-point spotlight

Amazing already.

[bobfriedman]

great idea... LED's can get pretty hot though

can you post a "how to" ?

[Erik Lund]

Thx! They actually need very little work to accept the mounts - They are extruded alloy housings, so one giant heat-sink
Pretty waterproof with soft rubber seal IP65
I'll see if I take them apart - but it's really easy to do
EUROLITE LED IP PST-10W 6400K Pinspot
 They are like 50€  the comparative ones for outdoor use is ten times that

[Birna Rørslett]

The 'Erikian LED' concept might be great for UV LEDs. All the [UV] illumination in the world precisely focused onto the poor subject  and no heat issue

[Erik Lund]

The 'Erikian LED' concept might be great for UV LEDs. All the [UV] illumination in the world precisely focused onto the poor subject  and no heat issue

Yes that's one more application that would benefit for sure!

[Erik Lund]

BTW it could just as well be an Nikon F-mount that is used

[Bent Hjarbo]

Very nice project, and some very interesting pictures as well

[Kim Pilegaard]

Quite interesting - maybe, I can use such a system for my outdoor bird photo studio.

[Anthony]

Clever!

[Kim Pilegaard]

BTW it could just as well be an Nikon F-mount that is used

I like this idea - then you could also easily put an old zoom lens in front.

[Fons Baerken]

I dont understand this how does it work?

[Akira]

Great idea and, as always, modification work!

I wonder if lenses like XR Heligon would minimize the loss of light?   

[Birna Rørslett]

They lend themselves to experimental work and modications, thus why not? I don't know if Erik has any such optic available to him although wouldn't be surprised if he had ...

[Erik Lund]

The Lenses, optics behave similar to when used for photographic work - I would say that this is sort of the opposite of using Projection lenses for Photography 
The LED element is clearly depicted/projected when you focus the lens, crisp and sharp.

The lens lets more light out the faster it is, so yes if you need high beam so to say you open up, if you want diffused and dampened you stop down.

Currently I have no super fast lenses in mount but could be great fun to try

Sure zooms work as expected and yes for a focused light for a bird hide out studio as well - For this application an old Visoflex lens with mirror box on a tripod, would be very handy, you could focus the lens via the reflex mirror, then shift it open and fire up the LED though the lens