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Light quality of older ARRI Fresnels (pre-1950)


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#1 Marc Roessler

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Posted 19 April 2009 - 03:00 PM

What are your experiences with the older-style ARRI fresnels?
(similar to this one http://eventtechnike...eum/ARRIalt.jpg )

The one I tried (1 kW) had a noticeably worse light qualitiy than the modern fresnels:
- uneven field of light with some very light circles visible in the projected light (looked as if it projected the fresnel lens pattern, esp. towards the edges
- a slighly darker patch growing in the center when flooding the thing
- quite some diffuse light spill from the front lens (probably because it is slightly roughened up at its lamp-facing side)
- spill, spill, spill from the top&bottom ventilation cuts... this seems to be due to the design: there is some metal to shield most of the light, but no real light trap as in newer fresnels

Also I feel that the beam is not as defined as with newer fixtures.

Is this puppy just misaligned or were the lights in general not that good back then?

Greetings,
Marc

Edited by Marc Roessler, 19 April 2009 - 03:01 PM.

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#2 Oliver Christoph Kochs

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Posted 19 April 2009 - 03:19 PM

Think it's just like that: They weren't so good. You should see the bulb of these - no questions asked!
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#3 Marc Roessler

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Posted 19 April 2009 - 05:05 PM

Think it's just like that: They weren't so good. You should see the bulb of these - no questions asked!


yes the bulbs are enormous... but I don't see why this by itself should be the cause for bad light..? the mirror needs to be placed further away (and has to have a larger radius of curvature), but other than that...? Besides, those were also available later with G22 halogen lamps... don't know whether this was standard from ARRI or retrofitted later, though...
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rebotnix Technologies

Willys Widgets

Tai Audio

The Slider

Paralinx LLC

Ritter Battery

Aerial Filmworks

Gamma Ray Digital Inc

CineLab

Technodolly

Visual Products

Glidecam

CineTape

Rig Wheels Passport

Broadcast Solutions Inc

Wooden Camera