04/1/14

Making of “Pens and Swords”

Today I’m going to start a little project about how I make some of my photos or build my light tools, usually using materials that can be found at home, because sometimes there’s no need to have an amazing studio to create decent photos. I won’t describe the details in each case, and the making of photos will probably be made with the smartphone, but feel free to ask if you have any doubts ;)

The idea was suggested by my friend and photographer Xavier Carol, check his blog if you want: lalquimista.com

For this first photo, I used a feather I found on the street. With a cutter, I carefully cutted the feather to the point I wanted, and then I placed a decoration sword I had at home inside the feather. I wanted a dark background but also emphasize the details of the sword and feather, so I used my computer screen and a polarizing filter in the lens, rotating the filter to a point where I saw a black background.

With some exposure time, I could illuminate the objects and also keeping a dark background. Also, although I knew the final capture would be vertical, it was much easier to make the photo horizontally due to the working area of my “soft box”.

Before:

20121124_220459

 
After:
 

 

 

02/13/13

Light Painting Wireframing tool

The idea:

Create a tool that projects a laser net to combine with the Light Painting photography technique, so that when projecting this net over a scene, it “seems” to be a wireframing view of a 3D modeled scene.

Solution:

Using only one laser pointer, create a set of horizontal and vertical lines that combined with the photo long exposure will result in a laser net. The laser pointer is moved by two RC servos controlled with a PWM signal generated by a 16F876A PIC microcontroller.
Once the circuit is done, the program can be configured to change laser speed, offset between lines and net size.

For the video I used a 7.4V LiPo battery, the voltage is regulated by a 7805, and the laser pointer uses one of the PIC 5V outputs with a 25 Ohms resistor.

Demonstration video with photo samples:

 

 

04/23/12

DIY LED torch for light painting: Results

I tried my recent built tool a few days ago, and I’m quite pleased with the results. Even using the LEDs at less than half power they illuminate a lot and worked great to create light orbs and other shapes like letters. Some examples below.

03/27/12

DIY LED torch for light painting

Light painting is an interesting photography technique in which we use long exposure in low light conditions and then draw using a flashlight or other objects that emit light, so that the resulting photo will contain all the movements and shapes we did with flashlight.

My purpose was to build a high power LED torch with the possibility to hang it from a chain or string so I could spin it or rotate it fast enough to draw an orb or other objects and still getting a bright result in the photo, because a typical LED torch or flashlight works well when trying to draw letters or lines in the light painting, because we move slowly, but when we move the flashlight much faster, the lines and spirals look much weaker, that’s why is useful to use high power LEDs, to see the light painting clearly. In addition, the batteries would add more weight at the end of the string, facilitating the spinning of the torch.

 

Component list:
- 1x 4 AA battery holder
- 3x high power SMD LEDs
- 1x PCB (1cm x 13cm approx.)
- 1x switch

 

The electrical circuit is very simple, basically there’s a 5ohms resistor and 3 SMD LEDs in parallel. The LEDs work at 3.8V with a power consumption of 350mA, but in this case I used a little higher resistor so the LEDs could still make more light, but I prefered a longer battery duration.

The circuit is divided in three small PCBs with one LED in each one, to illuminate in three different directions during the light painting.

To attach a string to the LED torch, I’ve added a M3 screw in the top part, but I still have to find an appropiate string or chain to use.

To make an orb with light painting you have to spin the LED torch with your wrist while you rotate slowly around yourself. This will create the effect of some sort of sphere, you can find a lot of examples of this technique.

I still haven’t tried it properly, I hope to post a new photo using this tool soon in my photography section, thanks for reading.