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Author
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Topic: How to set up scope focus
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Mitchell Dvoskin
Expert Film Handler
Posts: 128
From: West Milford, NJ
Registered: Jun 2008
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posted May 31, 2017 02:10 PM
This is what I do:
On the scope lens, there are marking indicating either meters or feet, depending upon the scope lenses vintage and origin.
1. Loosen the tiny lock screws so that you can turn the outer ring of the scope lens, lining it up about where the markings indicate the distance between the projector and the screen.
2. Run a film with high contract end titles (white letters against a dark background) with just the prime lens without the scope attachment.
3. Focus the prime lens, tape down the focus knob so it does not move.
4. Place the scope lens in front of the prime lens. There should be no vertical ghosting above or below the letters. If there is, you can fine tune by re-focusing the prime lens with the scope lens in place.
5. Turn the scope lens's focusing ring until there is no horizontal ghosting to the left or right of the letters.
6. Done. Tighten the tiny lock down screws so the scope lens focus does not shift.
NOTE: I have seen very few razor sharp 16mm scope films. Many are slightly off from the lab. However, any softness should be very minor.
NOTE: There are a lot of second hand scope lenses out there that have had some of the internal elements knocked out of alignment, and will never focus correctly. Since at short distances you can focus correctly, I don't think that this is your problem.
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