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This topic comprises 2 pages: 1 2
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Author
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Topic: Kinoton FP20 picture stability
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Ron Toole
Film Handler
Posts: 7
From: Washington, DC, USA
Registered: Jul 2008
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posted 08-25-2008 11:36 AM
Hi Ken,
Thanks for the welcome. Whenever I have a chance to swim through the posts I learn a bunch.
Neal's reputation in the Washington DC area is top rate. Everyone I've spoken with reiterates Neal's capabilites.
We were lucky to get two FP28's with less than a hundred hours on them. Neal's recommendation is to machine the shutter from 3 to 2 blades, modify the power source to power Xenon, and purchase new sound heads in order to play Digi audio.
Problem is we haven't got the monies needed to perform all of these modifications (in the 20k range). And we need to either get the projectors working or find an alternative storage place for them which may mean the dump.
Naturally I'd like to get these projs up and running so they don't become members of the latter group: they're beautiful machines.
Our throw is 66 feet, and our screen size varies - we project on a wall. I know, a screen will help with brightness. We will be getting a screen soon, but the maximum height of the wall is 132 inches, with a width that would accommodate all ratios relative to that height.
If we can get by with maybe just the shutter modification this will shave a few thousand bucks off, and we can maybe add the new-fangled sound heads later (we don't play many films with cyan).
Is the Xenon power modification more helpful than the shutter going to 2 blades?
Thanks, Ron
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John Hawkinson
Film God
![](http://www.film-tech.com/ubbmembers/1135b.jpg)
Posts: 2273
From: Cambridge, MA, USA
Registered: Feb 2002
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posted 08-25-2008 09:06 PM
A three-blade shutter interrupts the light at 72 Hz, versus 48 Hz for a 2-blade shutter. There are some differences in shutter angles, but if you ignore that, to a first approximation you have half-again (1.5x) as much light when you convert from 3-blade to 2-blade.
Going from 250W to 1600W is of course a 6.4x increase in light.
So the bulb change is definitely more significant than the shutter.
I'm not experienced at estimating brightness by screen size, but it sounds like you'd have a 20+ foot wide screen, and I would think you would ideally want at least 2K. Then again, Kinotons have glass reflectors (yes?), and that really helps.
I'm sure you wouldn't have to take them to the dump, I'd be stunned if Cardinal couldn't find a good home for them...
--jhawk
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