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Sunday, July 3, 2016

••◊ 5600K or Chroma Green Panel For Green Screen with the Cineo HS2?

Dom and I made a short tech video showing the difference between using the 5600K panel and Chroma Green panel when lighting up a green screen using the Cineo HS2.  In general, I like these LED lights.  They require only small adjustments in post to bring skin tones to perfection - no small feat for most LED lights.

The problem we had with our loaner units is that they didn't include the barn door set, so we had green spill galore problems and couldn't do a demo of a person in front of the screen.  The shop didn't have enough black solids left in rental to flag off the spill of the lights.  So if you use these, make sure they come with the rear ballast mount *and* barn door kit.

Sunday, June 26, 2016

••◊ Interview Camera Techniques

Dom, Haley, and I pounded out a quick camera tutorial yesterday on camera angles and focal lengths used during interviews.  This was Haley's first time on camera!

We were loaned two Cineo HS2 units right before the shoot and decided to assemble them and use them at the last minute.  The scene is almost completely lit with the two HS2's and a Cineo Matchbox.  There's a small amount of daylight coming through the windows which lit the back wall.  I made Dom take a picture.  What I found is that there was very little color tweaking in post to get the skin tones to look natural - a credit to their product.

This coming week we're going to do a video highlighting the HS2 lights.  So stay tuned.

Saturday, June 18, 2016

I began making 3D CAD for the LED light this last week.  It's slow going because I'm a newbie at mechanical CAD, but I'm slowly getting there.  In the photo above you can see the six bulb PCB's, a (unfinished) heat sink, and four fans for the assembly. 

The heat sink and fan vendors didn't have mechanical CAD publicly available for their parts so I'm having to make the parts myself.  I want to go as far as defining the entire bulb and cooling system in CAD, then leave the rest for the next phase of the project - which is the housing.

It's fun learning something new.  Now I can say that I'm a triple threat at work.  I design electronics, write firmware, now design mechanical parts.  I used to have to do this on engineering paper and an Excel spreadsheet, but installation of new CAM machines at work forced me into the modern age.

Sunday, June 12, 2016

••◊ Dom's Emmy Win!

I finally received a picture of Dom's Emmy win from last night.  He won for the Lomics app commercial, which I helped him color correct.  I'm not directly saying the color correction clinched the win, but... 

Congratulations on your award.  Now I can say that I work closely with an Emmy award winning director.

Saturday, June 11, 2016

••◊ How To Exposure Your Camera For Log Gamma (part 3)

Dom and I are back in action after a six month hiatus.  In this short tutorial we explain how to set your camera's exposure while using log gamma, or specifically Slog-3 on an FS-7.  It's short and simple, but gets the point across.

Sunday, May 29, 2016

••◊ Let There Be Light! (DIY LED light update)

I built up the first prototype bulb today on the DIY LED light project.  It was a complete pain because the LEDs have a thermal pad underneath the package and I had to use a heat gun on each one to solder them down.  At least all the LEDs are lit and working as intended.

The picture below shows the LEDs lit at 10% power.  If I crank them all the way up there's no way to take a picture without the rest of the electronics going completely to black.  I also haven't built any of the necessary heat sinks for the bulbs yet, so I'm hesitant to crank up the power to 100% for more than a few seconds.  In the final design there will be six bulbs, which should yield a useful amount of light for video.

The heat sink design is my next endeavor.  I've been learning mechanical CAD so I can do a proper CAM job and produce nice looking heat sinks.  The bulb design incorporates a digital thermometer so I can monitor the LED temperature.  Hopefully this weekend I'll get firmware for that feature up and running.

It's getting there SLOWLY, but slow is OK.  This is just a hobby project and I already have thoughts about version 2.

UPDATE : I have the thermometer running (woo hoo!).  The bulb gets hot pretty quick without a heat sink.

Tuesday, May 17, 2016

••◊ Another LED light update

This last week I've added a number of significant upgrades to my LED light project.  It now has a dedicated power supply and thermal management system.  The fan controller board just came in and I was able to build it up quickly.  Now I just have to add some code to get PWM control over the fans.

One nice thing is that I was able to find some affordable, almost silent fans.  Even with all four of them on at full blast there was barely a whisper.  The first ones I bought could compete with a lot of small kitchen electronic appliances; noise wise.  They had to go.

The power supply only handles up to 200W, but for my initial prototype purposes that shouldn't be an issue.  The LEDs I plan to use are fairly efficient.

After I have the fan firmware running, it's time to actually build the LED bulb.  This will take a little more effort since each bulb in the system will need a significant heat sink to keep the LEDs in their safe operating area.

More importantly...so far, no smoke!

EVENING UPDATE...  The fans are up and running with firmware.  That was quick!  All four fans are still very quiet at home and ramp up in speed nicely.  Now I'm going to be forced to actually work on the bulb design.