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Fun With Flares


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#1 Brian Wells

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Posted 28 July 2006 - 01:10 AM

I have long been aware of the "Star Pattern" lens flare exhibited by the DVX100A... What I wasn't aware of before now was the beautiful "Blue Streak" flare possible only on a wide open aperture with this camera. Wow, what a terrific find! Here's what I discovered tonight:

Equipment + Settings
Camera: Panasonic DVX100A, 24PA, f/1.6 (wide open), 1/1000th Shutter Speed, Century Optics 0.7X wide lens, Focus was on "84" which is Pana-Jargon for 20-30 feet away. No filtration.
Light: Dedolight DLHM4-300 (150W/24V, full spotted in the general direction of camera)
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Next, I racked the focus to "1" which is macro focus on this camera.
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I wanted to see if the flare was any different without the wide angle lens attachment. Turns out the flare is even more pronounced using only the built-in lens, without any add on's. I actually liked it better without the wide angle lens.
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As I "stopped down" the pretty blue flare started to give way to the "star effect" I'm accustomed to seeing from this camera. This still was taken at f/2.8, I think.
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By the time I reached f/5.6 the blue flare was completely gone.
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Just for fun, I popped in a Schneider Digicon 1 filter in the matte box and also aligned the Dedolight (still on full spot) directly into the lens of the camera and discovered this interesting effect.
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For the last shot, I flooded the Dedolight to see what would happen. Here's what I found.
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So, as you can see, it's possible to get some pretty neat flares with this camera and a point source!

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#2 David Sweetman

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Posted 28 July 2006 - 04:13 PM

The XL1 that I just used to shoot a summer camp had some crazy lens issues - I don't think this effect is standard with this lens (the 16x 5.5-88) and if it is, I apologize, but these flares from camera flashes struck me as really odd:

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#3 Michael Nash

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Posted 28 July 2006 - 04:38 PM

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Now just turn your camera sideways and you're on to something! ;)

Both the blue and green streaks are artifacts of the chips being overloaded, not optical flares. And the star-pattern is a direct result of the number of blades in the iris. Lenses with more iris blades have less of a distinct star pattern.

You might enjoy these:
http://www.claudiomi...com/Alpine.html
http://www.claudiomi...Alpine75mm.html
http://www.claudiomi...alpinemute.html
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#4 Daniel Sheehy

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Posted 29 July 2006 - 12:22 AM

The blue streak is vertical smear... fairly predictable when you point a ccd camera at a strong light source.

The horzontal green streak is odd, I've never seen anything like that. It almost looks like there is a defect on the green ccd.
Kinda reminds me of extremely dirty video heads. :huh:
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#5 David Sweetman

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Posted 29 July 2006 - 04:25 AM

Yeah come to think of it, it makes sense that it's a CCD issue and not a lens issue, because these would show up a few frames after the actual camera flash. Kinda makes me want to experiment with rigging up a bunch of flash bulbs to fire in sequence...could be a cool effect in a music video or something
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