8mm Forum: Damaged Film/Focus

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Topic: Damaged Film/Focus

Brian Collins
Film Handler

Posts: 96
From: Christchurch UK
Registered: Jan 2007

posted April 25, 2008 05:14 AM

I did write in about damaged sprocket holes on some film causing me problems with going in and out of focus on my S810 but have solved this problem by using a Bolex M8 projector as the pressure plate is at the rear of the gate and is giving perfect focus regardless of the damage,the only thing is that I find the speed control is very critical, has anyone else had the same problem?

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted April 25, 2008 09:19 AM

The rear sprung gate is the perfect design. This is particularly true for striped sound film, where the variation in thickness of the stripe can really screw up accurate focus when using fast f1.0 lenses. Why Elmo and Eumig, and just about everybody else, stuck with the front sprung gate is a mystery.
I have a Bolex 18-5 silent 8mm projector, which is also rear sprung. The focus is always dead flat across the picture- and it stays that way. With the Elmo GS1200 and the f1.0 lens, you spend the whole reel trying to keep the focus.

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted April 25, 2008 03:25 PM

That's why I love my Schneider-Kreuznach f1,2 lens. [Smile]

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Call me Phoenix. *dusts off the ashes*

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