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This topic comprises 2 pages: 1 2
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Author
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Topic: 2nd shutter blade on a SIMPLEX
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Phil Hill
I love my cootie bug
![](http://www.film-tech.com/ubbmembers/371i.jpg)
Posts: 7595
From: Hollywood, CA USA
Registered: Mar 2000
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posted 10-18-2000 01:47 AM
Thank you John for the most accurate description/reason for the "flicker blade" in two and three-blade shutters used in common (8,16,35,70mm...including 1570) motion picture projectors.Some of the special venue 48 fps and 60 fps (Showscan) projectors do not use a flicker blade and use only one light interruption per frame...only during pull-down... the frame rate itself provides flickerless viewing as described by Scott. However, most all 16mm projectors (and especially the "school" type ONLY have 2-bladed shutters. The selectable 2 & 3 blade types are usually found in the high-end 16mm projectors that run 16/18 and 24 fps. And, of course, there is the 5-blade shutter for (NTSC) telecine, but I won't mention that...OOPS! ![](http://209.164.109.192/ubb/smile.gif) >>> Phil
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