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Author
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Topic: Checking illumination of LED reverse scan
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 06-16-2004 07:40 AM
You can't really use the solar cell to compentsate for misaligned LED. You would have to move the film with the lateral guide roller, then move the cell to compensate.
If you go crazy moving the LED with the CE reader, you aren't very good. Cat. 566 is also the easiest film to set LED height for maximum gain. If the LED isn't in that sweet spot, you are apt to get microphonics created by the vibration of the LED.
Generally, you won't have problems with Simplex's LED postion since they had decent consistancy. With Century, watch out...no two were the same but they were adequate in the mono era.
If you have a fixed LED bracket system, on a Century, you may find yourself shimming the LED bracket to get good alignment.
With the CE system, you can adjust the LED to match the film and wit the 30 series, you can also adjust the solar cell (laterally) if you need to compensate for a poorly machined soundhead.
The only time I drag out Cat. 97 anymore is to reposition the cell and that is rarely.
While I've never been a fan of multi-loops (some splice two or more test films together)...I can generally do a combination analog and digital basement reader in four loop passes with reliable and precise calibration for both systems.
Steve
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