Increasing Flash/Strobe Output without Increasing Power

Started 4 months ago | Discussions thread
Ellis Vener
Ellis Vener Forum Pro • Posts: 11,736
Re: Increasing Flash/Strobe Output without Increasing Power

flyinglentris wrote:

jlafferty wrote:

You bring up a good point and I’m realizing now that my earlier claims might be mistaken… it might be the specifics of my Fresnel at fault as it both has the bulb facing forward, and has a black interior.

Traditional Fresnels have a highly polished silver dish at the back, silver interior, and the bulb sits perpendicular to the output direction. All are likely factors in making them the most efficient modifier possible (focus zoom spot might be similar), even moreso than the long throw Magnum. But I don’t have a Fresnel of that proper design onhand to test.

I am curious at this point to understand why Fresnel lenses like the 5600 Big Eye were designed without a reflector behind the light source and which have the tube vertical and not aligned with the axis of the beam.

Because the lighting instrument needs its own specific to light source (bulb if HMI , flashtube if a flash)

The photo on the 5600 web site clearly shows this such that the tube is vertical and the behind the lens, it's all black from the canvas cover.

Hmmmm? Why did the engineers do it that way?

If I had to venture a guess, I'd reflect first on their design being able to accommodate any flash unit and then, expect that they also allowed that this design also allowed incorporation of any reflector. In other words, they didn't intend for it to not have a reflector, but intended to allow any strobe with or without reflector to be used. My guess.

But then too, maybe having a reflector will kill the ability to adjust the Fresnel lens.

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flyinglentris in LLOMA

It was designed specifically for the K5600 Joker 400 HMI but can be used with baretube flashes (like a Profoto Pro or Acute Head) or other lights. I used one with an Einstein fitted with a Balcar Disk reflector /Angle Reducing Ring)  (check eBay)   but also with TTL controlled Canon EX 600 RT II and Nikon SB-5000 Speedlights.

Electronic flash turn  energy (watt-seconds) into light far more efficiently than any tungsten filament light, even HMI lights, so I found I didn’t need to use the Einstein at anything like full power.

unlike the Fresnel lenses used in light houses, Fresnels for photography are not shaped to project a beam of light enormous distances. On the movie sets I have been on and in behind the scenes set photography I have seen a big lensed Fresnel light source is rarely directly illuminating the set. Usially they are used to project light into a large (8x8 or 12x12 foot) diffusing scrim that is much close to the actors and cameras or is aimed at an equally large fabric bounce panel.

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Ellis Vener
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